davies, shs, nov 2006 introduction to occupational hygiene associate professor brian davies
TRANSCRIPT
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Davies, SHS, Nov 2006
Introduction to Occupational Hygiene
Associate Professor Brian Davies
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Assoc. Prof. Brian Davies AM
• Worked as an Occupational Hygienist in industry for > 30 years
• Certified Occupational Hygienist (ABIH & AIOH)
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Assoc. Prof. Brian Davies AM
• Worked in the steel, aviation & mining sectors (including petroleum exploration)
• Currently Associate Professor of Occupational Hygiene & Toxicology at the University of Wollongong, Australia
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Aim of This Course
To introduce participants to the discipline of Occupational Hygiene & demonstrate how it can be applied in the workplace
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Learning Outcomes
At the conclusion of this course you should be able to:1) Understand the principles of occupational hygiene and workplace sampling2) Conduct a walk through survey and recognise the chemical, physical & biological agents present
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Occupational Disease
Causes of occupational disease fall into four major areas
–Chemical agents
–Physical agents
–Biological agents
–Psycho-social causes
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Chemical Agents
• Dusts
• Metals
• Vapours
• Gases
• Pesticides
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Diseases of the Skin• Dermatitis
– inflammation of the skin
– two types (irritative & sensitising)
• Irritative: alkalis, acids, cement, solvents, some metals & their salts
• Sensitising: chrome salts, nickel, cobalt, urea or phenolic resins, some woods
• Skin cancer
– Coal tar pitch, shale oil, mineral oils (unrefined)
• Erythema
– Pitch
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Diseases of the Respiratory System
• Pneumoconiosis
– Reaction of lung to presence of dust
– Benign (iron, tin, barium)
– Symptomatic (coal dust)• Silicosis
– Fibrosis & lung cancer• Asbestosis
– Fibrous thickening in lower parts of lung, loss of elasticity
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Diseases of the Respiratory System
• Lung Cancer
– Mesothelioma (crocidolite)
– Chromates, Nickel compounds, CTPV
• Bronchial Asthma
– Mainly sensitisation
– Isocyanates, Colophony fumes, hardwood dusts (cedar, oak & mahogany)
– Byssinosis ,Bagassosis
• Extrinsic Allergic Alveolitis
– Farmers lung (mouldy hay), Pigeon fanciers lung (droppings)
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Diseases from Metals
• Lead - systemic poison
• Mercury - organic mercury more toxic
• Chromium -ulceration, nasal cancers
• Arsenic - skin cancer
• Metal fume fever - fumes of metal oxides (eg zinc)
• Manganese – motor neuron disorders
• Cadmium- kidney disease
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Vapours• Vapours (Solvents)
– Dermatitis
– Cause narcosis (CNS depressants)
– Some damage peripheral nerves
– Some damage kidneys & liver
– Some interfere with blood formation
– Some can penetrate the skin
– Most decompose on heating to toxic compounds
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Gases• Simple asphyxiants
– Replaces oxygen in the lungs (Carbon dioxide)
• Irritants
– Can cause bronchitis and pulmonary oedema (sulphur dioxide)
• Toxic
– Causes a metabolic interference with the oxygen taken up by the body (carbon monoxide)
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Pesticides
• Insecticides
– Organo-phosphorous compounds
– Interfere with enzyme called cholinesterase
• Herbicides
– Liver ,kidney & lung damage possible with some products
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Physical Agents
• Noise induced hearing loss (NIHL)
• Vibration
• Ionising radiation
• Non-ionising radiation
• Heat & cold stress
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EFFECTS OF NOISE
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EFFECTS OF NOISE (Cont)
Healthy Cochlea
Damaged Cochlea
Photos showing actual damaged ‘hair cells’ in the inner ear
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Biological Agents
• Viruses-Hepatitis A B & C, HIV
• Bacteria-Legionella, Q fever,
Anthrax, Leptospirosis
• Fungus- Moulds, Histoplasmosis,
Farmers lung
• Plant-Poison Ivy,
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Psycho-Social Causes• Stress
– The person (lack of physical & mental fitness, inadequate training or skills, poor reward & prospects etc)
– Work demand (long hours, shift work, repetitive work)
– Environment ( noise, heat, humidity, fumes etc)
– Organisation (poor industrial relations, communication, supervision)
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Relationship to Occupational Hygiene
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What is Occupational Hygiene ?
'Occupational Hygiene is the discipline of anticipating, recognising, evaluating and controlling health hazards in the working environment with the objective of protecting worker health and well-being and safeguarding the community at large.'
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Aims of Occupational Hygiene
• Recognition of health problems created within the industrial environment
• Evaluation in terms of long and short term effects
• Development of corrective measures to control problems
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Recognition
• Need to recognise the problem
– What health effects are presenting
– What health effects are a possible (walkthrough audits)
• Need to understand the process
– What is causing the health effect
– How are people being exposed
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Coal Mining
Dust
Noise
Diesel emissions
Hazardous substances
Fungi
Vibration
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Aluminium Smelter
CTPV
Heat stress
Metal fumes
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Welding
Welding fumes
Toxic gases & vapours
Radiation
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Sand Blasting
Silica exposure
Noise
RPE
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Pipe Laying
Welding fumes
Heat stress
UV radiation
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Aviation Industry
Composites
Cu Beryllium
Hazardous
substances
Noise
Confined spaces-
fuel vapours
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Oil Industry
Noise
Hydrocarbons
Hydrogen sulphide
Heat stress
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What are the risks here ?
Gold processing
plant in West
Africa
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Gold Processing Plant
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Gold Room
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Group Exercise 1
• Break up into allocated groups
• List all the health issues you think are present at this gold processing plant (see notes)
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Evaluation
• How can the contaminant of concern be quantified
– Chemical, physical or biological
– Dust, vapour ,mist, gas, fibre
– Sampling method
– Is quantification actually necessary
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Preventative Principles
• Substitution
• Segregation
• Enclosure and mechanical handling
• Ventilation
• Work practices
• Personal protection
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How do substances effect the body?
• Workers need to come in contact with them - gases, vapours, dusts, noise
• Need to reach a target organs -different target organs for different things
• Need to be in sufficient dose to cause harm
dose = concentration x duration of exposure
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Routes of EntryContaminantContaminant
IN THE IN THE AIRAIR
SKINSKIN
SURFACESURFACE
SPILLSPILL
BREATHINBREATHINGG
Source :Airmet Scientific
Other ways:
Eyes &
Ingestion
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Routes of Entry• Inhalation
– By far the major entry point for contaminants• Skin Adsorption
– Major source of entry for some organic compounds such as phenol and organophosphate pesticides
• Eye
– Entry point for some solvents
• Ingestion
– Poor hygiene can allow contaminants (eg lead) to enter the body
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Target Organs
• Upon entry to the body contaminants can have an adverse effect on one or more organs (target organs)
– Lungs
– Blood
– Central Nervous System
– Liver
– Kidneys
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What does an MSDS tell you?
Detailed information on a dangerous goods or hazardous substance
Product Name
Codes, Listings
Major Uses
Ingredients
Physical Characteristics
Precautions for Use
Safe Handling and Storage Information
First Aid/Emergency
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To be useful, MSDS’s, must have…
Issue Date
Company Details (Not O/S)
Substance Name
Health Effects/First Aid
Engineering Controls
Flammable/Fire & Expl. Haz.
Storage & Handling
Spills & Disposal
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How do Hygienists Use MSDSs?
• As a source of information on
– Toxic effects
– Exposure standards
– Control technologies
• Engineering
• PPE
– Reference to other analogous compounds
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Group Exercise 2
Evaluating MSDS
• Review of some MSDS
• What are the key issues wrong with the MSDS’s provided?
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Hazard Identification
• Review the materials , processes & procedures used in the plant
– Process flowcharts
– MSDSs
– Health effects of possible contaminants
– International literature
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A Case Study-Know The Process
• Copper, Gold and Silver mine
• 200 PPM arsenic in the copper ore
– Known by geologist
– Solid solution with the copper
• Beneficiated with the copper in the float cells
– Known by the metallurgist
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A Case Study- Know The Process
• As Concentration now 5000 PPM (0.5%)– 50% slurry, no dust
• At port slurry de-watered and dust generated
• 10 mg/m3 inhalable dust => 0.05 mg/m3 As
• As ES is 0.01 mg/m3 thus possible to have overexposures at dust levels below inhalable dust exposure standard
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Purpose of a Walk Through Survey
• To familarise yourself with the process
• To establish potential health risks
• Identify any engineering controls
• To establish what, where & whom should be monitored
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Walk Through Survey
• When conducting a walk-through survey
– Look for signs of possible exposure (emissions escaping from system, hazardous chemicals, deposits on floors & surfaces, noise equipment etc)
– Condition of any control technologies including PPE
– Location of workers to sources of contamination
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Group Exercise 3
• Break into allocated groups
• Conduct a walk through survey of area indicated by Brett Young
• Return to room and list all potential health risks (if any) you identified
• How would you decide which of the possible health risks to quantify
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How do we evaluate hazards?
• Need to establish what the hazard is (or likely to be)
• Need to develop a suitable monitoring programme
• Need to follow established monitoring techniques
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How do we evaluate hazards?
• Evaluate the results in terms of the hazard (chronic, acute etc)
• Make improvements to the workplace if necessary and conduct follow-up sampling
• Keep a record of everything
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What is Monitoring?
Process of conducting measurement (s) of the concentrations of airborne contaminants.
To estimate risk the following are required;
a reliable estimate of exposure
a standard for means comparison
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Exposure Standards
“No substance is a poison by itself, it is the dose that makes a substance a poison” (Paracelsus 16th Century)
• Hazard <=> Toxicity
• Hazard = Toxicity x Exposure
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Dose Effect Relationship
• For each chemical there is a dose-effect relationship
– Acute effects (irritants, carbon monoxide)
– Chronic effects (benzene , asbestos fibres)
Basis of exposure standards
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Threshold
• The dividing line between no-effect and effect levels of exposure
• For each substance there is a threshold of intoxication which is usually different for individual substances
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Dose-Response Curve
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Individual Susceptibility
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Threshold of Intoxication
For each substance, no matter how toxic, there exists a dose level called the threshold of intoxication which the human body is capable of accepting and detoxifying without injury to itself.
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Basis of Exposure Standards
• Toxicity• Biological action
– Asphyxiants
– Anesthetics
– Carcinogens
– Irritants
– Systemic poisons
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What limits exist?
• ACGIH (USA)
• HSE (UK)
• OSHA (USA)
• MAK (Germany)
• ASCC (Australia)
• Many other countries
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What do they exist for?
• Chemical hazards
– Vapours, gases, dusts, fibres• Physical hazards
– Noise, vibration• Biological hazards
– Linked in most cases to chemical hazards
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Types of exposure standards
• TWA (time weighted average)
• STEL (short term exposure limit)
• Ceiling/Peak (never to be exceeded)
• Skin Notation
• General Excursion Advice
• Carcinogen category
• Not otherwise classified
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Limitations of Exposure Standards
• Values do not exist for all substances
• They are guides only not fine lines between safe and unsafe
• They may not protect all workers but “nearly all workers”
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Extended Workshifts
• Brief and Scala model
• OSHA model
• Pharmacokinetic model
• A more practical approach uses the total time worked per month
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Which Substance is the Most Toxic ?
• 50 PPM
• 10 PPM
• 2 PPM
• 0.5 PPM
Each person is allocated only one vote
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Which Substance is the Most Toxic?
• 50 PPM HALOTHANE(ACGIH- USA)
• 10 PPM HYDROGEN CYANIDE
• 2 PPM SULPHUR DIOXIDE
• 0.5 PPM HALOTHANE (ASCC-Australia)
Why is there this difference?
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Why Monitor Workplaces?• To establish the level of risk in
respect to adverse health effects in workplaces
• To meet regulatory or corporate requirements
• To develop appropriate control measures
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Why Monitor Workplaces (Cont) ?
• To measure the effectiveness of control measures
• For research purposes
• To dispel anxiety
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Types of Surveys
• Initial - to gain information
• Basic – qualitative assessment
• Detailed - quantitative assessment
• Routine – monitor compliance/controls
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•WHO
•WHERE
•WHEN
•WHAT
•HOW
Sampling Strategy
METHOD
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Exposure Judgement Outcome
• Acceptably low
• Too high
– Fix the problem
• Cannot make a judgement
– Need for more information (samples/assistance from others)
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Inputs to Judgement
• Process experience
• Material characteristics
• Toxicity
• Workforce characteristics
• Statistical tools
• Confidence in exposure limit
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Who should be monitored?
• Everyone?
• Those identified as potentially exposed from walkthrough survey or risk assessment?
• Controls?
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Types of Sampling
• Grab
• Short-term
• Long-term
• Continuous
• Bulk
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Bulk Sampling
• Substance(s) identification only
• Cannot be related back to airborne
concentration
• Can sometimes be used with other direct methods to calculate worst-case scenarios
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What should be monitored
• Contaminants identified in walkthrough survey or risk assessment
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What type of sample?• Area
– Should only be used to assess the effectiveness of control strategies
– Does not take account of an individuals movements
– Has no legal standing• Personal
– Accounts for movement of workers
– All exposure standards are based on personal sampling
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How many samples?• Single samples
– Some legislation is based on single sample compliance
– Approach has issues due to variability within an exposure cloud
• Multiple samples
– Improved accuracy but how many samples are enough
• Statistically based sampling
– Most accurate approach but time consuming and very costly
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How long should samples be collected?
• Substance properties
– Acute or chronic adverse health effects
• Duration of work shift
– Shift length
– Work pattern within shift
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What method should be used?
• If possible always use recognised standard methods
– Some industries have statutory methods• Some reference methods are:
– NIOSH
– UK HSE (MDHS)• Always check validity of non standard
methods to ensure they withstand external scrutiny
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After Data Collection
• How will the data be evaluated?
• How will data be stored and communicated to stakeholders?
• What is unacceptable?
– Statutory requirement
– Corporate requirements
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Statistical Based Monitoring
• Approach developed in 1970’s by NIOSH
• Collect a statistical sub-set of worker exposure to represent all persons’ exposure in a SEG (HEG or KEG)
• Sampling must be random
• Number of samples collected determined by required confidence level
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Process of statistical monitoring
• Establish similar exposure groups (SEGs)- This may require preliminary sampling
• Develop statistically based sampling schedule
• Collect data according to defined programme
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Process of statistical monitoring
• Statistically analyse data
• Modify exposure groups (if required)
• Final report or ongoing reports
• Ongoing data collection (maintenance sampling)
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Establish Similar Exposure Groups (SEGs)
• Can be defined by:
– process and environmental agent
– process, job and environmental agent
– process, job, task and environmental agent
– process, task and environmental agent
– work teams
– non-repetitive work
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Establish Similar Exposure Groups
• Observational
– Simplest form but least accurate
• Sampling
– Preliminary sampling to establish groups
• Combination of observation and sampling
– Most accurate approach
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Longwall Mining
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Continuous Miner (Panel)
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Basic SEG Structure- Coal Mine
SEG Description No. Workers1 Longwall 60
2 Panel 70
3 Methane Drillers 14
4 Tailgate Workers 8
5 Outbye Workers 60
6 Surface Workers 16
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Outbye Workers- Secondary SEG Structure
Task Number
Materials crew 35
Belts 5
Diesel workshops 8
Cable crews 12
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Revision of SEGs
• SEGs should be revised when:
– New data is available
– A change to the process occurs
– New jobs are created
– New contaminants may be present
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Methods of estimating No. of Samples
• Q: How many times do I need to make measurements for the results to be statistically valid and useful?
A: Depends on information you need.
Compliance
Research
Corporate requirement
Degree of confidence
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Practical Options
• Point of diminishing returns
• Reasonable approximation of exposure profile possible with about 6-10 samples (AIHA 1998)
• As exposure standard approaches exposure limit this number increases depending on level of confidence required
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Source : AIHA (1998)
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Random Sampling• Need for defined sampling period
– 64 weeks normal but can be as low as you wish
– Very hard to manage major programmes below 16 weeks
• All samples must be collected without bias
– Sampling schedule based on random numbers
• Need to write a detailed sampling protocol
– Any deviations must be accounted for in protocol and noted at time of event
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Sampling Schedule
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Lets do some monitoring
• Dusts & fibres
• Vapours & gases
• Noise
• Biological monitoring
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Dusts & Fibres
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Composition of Dusts
Fibrogenic reactions (quartz)
Carcinogenic response (chromates)
Irritation (acid mists)
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(PM 10)(PM 10)
ISO/CEN Convention
Source :Airmet Scientific
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Relative size of particles
• 1 3 7 10 30 100
Inhalable Inhalable dust dust 100 100 micronmicron
Thoracic dust Thoracic dust 30 micron30 micron
Respirable Respirable dust dust 10 10 micronmicron
RESPIRABLERESPIRABLE
THORACIC THORACIC (PM10)(PM10)
INHALABLEINHALABLE
Source :Airmet Scientific
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Respirable Dust
•Gets deep into the lung
•Not easily removed
•Invisible to human eye
• 4.0 micron at 50% cut
•Gets deep into the lung
•Not easily removed
•Invisible to human eye
• 4.0 micron at 50% cut
Source :Airmet Scientific
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The Cyclone
•Inlet points down
Separates theRESPIRABLE
dust
Suction from top
Contains cassette
Source :Airmet Scientific
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•Retaining ring•Cyclone top
•Cassette (filter)
•Main Body
•Grit pot
Source :Airmet Scientific
Parts of a Cyclone
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Inhalable Dust
•Affects the whole of
the respiratory
system
•100 micron at 50% cut
•Affects the whole of
the respiratory
system
•100 micron at 50% cut
Source :Airmet Scientific
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The I.O.M. sampler
•Inhalable sampler
•Cassette system
•All collected dust is
measured
•Easily handled
•No contact with filter
•Multi fraction sampling with
foam inserts
IOM IOM samplersampler
IOM IOM cassettecassette
TransporTransport clipt clip
Front Cassette Filter Support O Front Cassette Filter Support O ring Bodyring Bodycover front gridcover front grid
Source :Airmet Scientific
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IOM Cassette
•IOM Cassette.•Cassette and filter are pre and post weighed as a single unit
FILTERFILTER
Source :Airmet Scientific
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The IOM complete
•Place cassette in body
Screw front cover on
Source :Airmet Scientific
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Sample Train•Is made up of :
•Pump•Connecting tube
•Sampler•Any accessory
SAMPLESAMPLERR
CONNECTINGCONNECTINGTUBETUBE
PUMPPUMP
Source :Airmet Scientific
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Calibration
•Connect from pump to sampling head•Connect from sampling headto calibrator
Adjust flow to require flowrateSource :Airmet Scientific
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Soap Film Meter
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Electronic Flowmeter
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Position of Sampling Device
•ALL Exposure limits are based
on
•PERSONAL SAMPLES
And MUST be And MUST be taken in the taken in the
Breathing ZoneBreathing Zone
300mm 300mm Hemisphere Hemisphere around the around the nose and nose and
mouthmouth
Source :Airmet Scientific
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Taking the Sample
•Place sample train on person:
Start pumpNote start time
At end of sample:
Note stop time
Source :Airmet Scientific
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Direct Reading Instruments
• Hund Tyndalometer
• Dust Trak
• R & P PDM
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Hund Tyndalometer
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Dust Trak
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Problems with direct reading instruments
• Most devices cannot distinguish between water droplets from suppression sprays and dust particles
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R & P Personal Dust Monitor
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TEOM Series 3600 Personal Dust Monitor
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Real Time Data
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Remote Control Miner Operator, Major Exposure Variables
6:00 7:12 8:24 9:36 10:48 12:00 13:12 14:24 15:360
1
2
3
5
Mass
Con
cen
trati
on
[m
g/m
³]
Time
4
16:48 18:00
MassConcentration Cumulative
Concentration
ProjectedExposure
Source: CDC-NIOSH Pittsburgh Research Laboratory
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Fumes
• Use open face sampling head (IOM or other)
• Analyse collected material for contaminants
• Need to be careful of filter pore size
– Welding fume typically <1 um
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Types of Fibres
• Asbestos
• Synthetic or MMMF
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Asbestos• Fibrous silicate minerals
• Main types
– Chrysotile
– Amosite
– Crocidolite
– Actinolite
– Anthophylite
– Tremolite
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Health Effects
• Pleural Plaques
• Asbestosis
• Lung Cancer
• Mesothelioma
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Management of Asbestos
• Identification – dispersion staining microscopy, XRD & IR
• Assessment - Membrane filter method
• Control- Removal, encapsulation, monitor
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Bulk Amosite
Copyright A Rogers
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Asbestos-Ships Lagging
Copyright A Rogers
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Tremolite Rock and Fibre
Copyright A Rogers
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Calcium Silicate and Amosite
Copyright A Rogers
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Dispersion Staining for Identification
Copyright A Rogers
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Polarised Light – Ist order Red
Copyright A Rogers
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Types of SMF• Glass fibre
– Reinforcing filament
– Glass wool
– Ultra fine glass fibre• Mineral wool
– Rock wool
– Slag wool• Ceramic fibre
– Refractory ceramic fibres
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Health Effects of SMF
• Significantly less potent than asbestos
• Larger fibre sizes induce irritation
• No fibrosis has been demonstrated
• Some slight risk of lung cancer but debate continues
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Measuring Airborne Fibres
MEMBRANE FILTER METHODPump and filter (cellulose ester)Phase contrast microscopySampling (Occupational & Para-
occupational)Filter mounting and clearingKohler illuminationSpecific counting rulesCertified counters
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Membrane Filter Method Slide
Copyright A Rogers
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Vapours & Gases
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Sampling SystemsSampling systems
– Active
• Pump and adsorption tube (vapours)
• Pump and liquid absorption (gases & vapours)
– Passive
• Solid adsorption (vapours)
• Direct reading (gases & vapours)
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Vapour Sampling
•With sorbent tubes
Main bedMain bed
Back-up bedBack-up bed
Retaining clipRetaining clip
Foam separatorFoam separator
Precision drawnPrecision drawn
glass tubeglass tube
Source :Airmet Scientific
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Breakthrough?•When a sorbent if full to capacity, breakthrough occurs
BreakthrougBreakthrough is when a h is when a tube tube becomes full becomes full and re-and re-releases the releases the hazardhazard
Source :Airmet Scientific
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Tube Holder
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Gas/Vapour Sampling Train
•Break off both ends of a sorbent tube (2mm min dia, or 1/2 dia of body)
Put tube in low flow adapter/tube holder
Make sure tube is in correct way around
Source :Airmet Scientific
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Calibration of a tube
•Connect to calibrator•Adjust flow at low flow adapter
Use soap Use soap film or film or electronic electronic metermeter
Source :Airmet Scientific
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Taking the Sample
•Start pump
•Note start time
•At end of sample:
•Note stop time
SKC
SKC
Place sample train on person:
Source :Airmet Scientific
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After the sampling•Remove tube
•Place covers on tube
•Send off for analysis with details of sample
Don’t forget to send a Don’t forget to send a BLANKBLANKDon’t forget to send a Don’t forget to send a BLANKBLANK
Source :Airmet Scientific
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Sample bags - gases
•Made from Tedlar•Inert•Valve/inlet with septum•No auto shut off•Fill by flow X time•Designed as single use
Source :Airmet Scientific
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Bag filling
•Do not overfill•Bag will take 3 times stated volume
More pressure means more migration
Fill to correct Fill to correct volume by setting volume by setting flow rate and flow rate and time… otherwise?time… otherwise?
Source :Airmet Scientific
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Badges - Dosimeters
Sorbent bed
MembraneMembrane
Protective Protective diskdisk
Support gridSupport grid
SmallSmall
LightLight
No pumpNo pump
Needs air Needs air movement to movement to
workwork Void for solventVoid for solvent
Source :Airmet Scientific
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Badges and their sorbents
•Activated sorbent•Over 100 chemicals •No need for backup layer if method followed•Larger molecules can dislodge smaller ones•Does not work in ‘still air’ conditions
Source :Airmet Scientific
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Direct Reading Instruments
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Cross Sensitivity (CO Sensor)
H2S ~ 315
SO2 ~ 50
NO ~ 30
NO2 ~ -55
Cl2 ~ -30
H2 < 40
HCN 40
C2H4 90
Challenge concentration - 100ppm of each gas
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Filters for Contaminant Gases
H2S ~ 315 < 10
SO2 ~ 50 < 5NO ~ 30 < 10
NO2 ~ -55 ~ -15
Cl2 ~ -30 < -5
H2 < 40 < 40HCN 40 < 15
C2H4 90 < 50
Unfiltered Filtered
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‘Port’a’man!’
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Noise
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Common Terms
• SLM – Sound Level Meter (instrument consisting of a microphone, amplifier and indicating device (SLM/dosimeter)
• Dosimeter – SLM that can record history• dB – decibel – measurement of Sound
Pressure Level• Sound power – total sound energy
radiated by a source
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Common Terms
• Leq – equivalent continuous noise level of a fluctuating sound over time ie LAeq8hr = 8 hrs (A weighted).
• A Weighting – scale with frequency response - human ear
• C Weighting – scale to determine level of hearing protection required (high)
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Introduction to Sound Level Meters
• Integrating or non-integrating
• Type 0,1 – precision• Type 2 –
general/industrial use• Type 3 – indication only • Filters and weighting
networks A, C, lin• Frequency analysis – 1/3
and octave band• Primarily for walk-
through survey work
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Introduction to Dosimeters
• SLM with ability to provide an integrated noise exposure over a given period (ie work shift – 8, 10, 12 hr)
• Most provide data logging with ability to set statistical parameters, alarm levels, and record peaks in addition to exposure in increments – normally 60 sec.
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What is Noise Dosimetry?
• Noise dosimetry is used to determine occupational exposure over a work period.
• Particularly relevant where noise sources are cyclic or where an operator moves around a large area of a workplace with many difference noise sources.
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Typical Dosimeter
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How do you determine what is required?
• Noise survey, contour plans, dosimetry
• Is the survey based on reaction to specific complaints or issues.
• Is it a baseline survey to establish “hearing protection zones”.
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How do you determine what is required?
• Does the employer wish to assess suitability of hearing protection.
• Where does/do the worker/s spend the bulk of their time
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Noise Exposure Dosage Guide (unprotected)
Limiting dB(A) Maximum duration85 8 hr
88 4 hr
91 2 hr
94 1 hr
97 30 min
100 15 min
103 7 min
106 4 min
109 2 min
112 1min
115 30 sec
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Evaluation of data
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Types of data evaluation
• Statutory requirement
– Straight comparison to exposure standard
• Statistical sampling
– Statistical evaluation
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Statutory Requirement
• <<ES - acceptable
• ES – unacceptable but more sampling may improve situation
• >>ES - unacceptable
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Statistical evaluation of exposure data
• Need to define what you are trying to achieve
• Need some understanding of statistics
• Need to realise that nothing is perfect and there is still a possibility of overexposure
• Need to define when it is better to fix the problem rather than keep sampling
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Statistical Computer Packages
• Many packages available
– Hygienist (Dutch), LogNorm2, IH stats• IH Stats (AIHA as part of book package)
– Excel based but limited in application (50 data points), no ANOVA
• LogNorm2 (AIHA but also visit www.lognorm.net)
– Easy to use, good graphics but problems when applied to noise exposure
– Requires minimum of 6 data points
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Statistical Metrics
• GM & GSD
• MVUE
• 95 % UCL
• 95 % ile
• UTL
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Data Treatment-Typical Example
Inhalable Dust – Personal sampling on a random schedule over 16 weeks.
5.5 4.2 1.4 1 3 9.7
6.8 33 4.4 1 3 43
214 11.2 22 1.4 2.3
10. 38 22 26 40
Total = 20 samples
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Sequential Plot of Data
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Log Probability PlotLogprobability Plot and
Least-Squares Best-Fit Line
99%98%
95%
90%84%
75%
50%
25%
16%10%
5%
2%1%
0 1 10 100 1000
Concentration
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Typical Example - Descriptive Statistics (LogNorm 2 with ES of 10mg/m3)
• GM = 13.9 mg/m3• GSD = 3.7• MVUE (estimate of mean) = 30.7 mg/m3• Lands 95% UCL = 82.1 mg/m3• UTL (95%,95%) = 326 mg/m3• Exceedance Fraction 95%UCL = 73.2 %
95% confidence that 95% exposures < 326 mg/m395 % confidence that exposures > ES 73.2% of the time
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BHP Billiton (Chronic effects)
• 95 % UCL of MVUE < 0.5 ES (Acceptable)
• 95% UCL of MVUE >0.5 but <ES (ALARP)
• 95% UCL of MVUE > ES (Unacceptable)
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BHP Billiton (Acute effects)
95% Upper Tolerance Limit < ES
Note=Only where warning properties are adequate and olfactory fatigue is not a problem
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Other Approaches• RioTinto
– Prefer the use of 95% UCL of MVUE
• South African mining industry must supply
90 % ile and GM to check for correct banding
• Alcoa and Merck Inc -
No more than 5% of exposures to exceed ES (95% ile)
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Other Approaches
• AIHA suggests using UTL < ES
(considered good statistic for comparison to ES but very conservative)
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Using Data to Drive Improvement
• Need accessible database to store information
• Graphical presentations to management have best effect
• Useful to measure effectiveness of controls overtime
• Useful to dispel myths
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Data PresentationExposure to Kryptonite
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Transport Gen Hand Maintenance Management Surface Mining Drilling
mg
/m3
Unacceptable
ALARP
Acceptable
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What can companies do?
• Inspect workplaces for potential health hazards
• Seek advice from occupational hygienists to evaluate those hazards
• Introduce appropriate control strategies
• Ensure any control strategies are maintained
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What are the benefits ?
• Healthy & happy workforce
– Evidence to show this leads to increased productivity
• Lower compensation payments
– It is illogical to harm people and then compensate them for their suffering. Fix the problem so no one gets hurt
• Reduced corporate pressure
– Always a good outcome
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A point to remember
In many cases it is simpler and cheaper to fix the problem rather than conduct a sampling programme!