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Lab Manager's Independent guIde to purchasIng a tItratormay 2011 Copyright © lab manager magazine®

Author: John Buie

titration, a common laboratory method of quantitative chemical

analysis used to determine the unknown concentration of a

known reactant, is today usually performed by a dedicated

titrator. Different types of titrators are available depending on the

specific analysis required. the first consideration when purchasing

a laboratory titrator is to decide what type of analysis is required.

IntroductIon:

Radiometer AnalyticalTitraLab 980

Mettler ToledoT50

Mettler ToledoT70

Mettler ToledoT90

Hiranuma/JM ScienceCOM-300A

A Potentiometric plus KF

Some titrators are equipped to perform both potentiometric and Karl Fischer titrations.


Hiranuma/JM ScienceCOM-1700

B Conductivity plus potentiometric

Some titrators are equipped to perform both potentiometric and conductivity titrations.

comBIned mode

in some circumstances, particularly where different types of analyses are required from time to time and no single analysis is performed routinely, a combined titrator may be the ideal solution.









Hanna InstrumentsHI 84431

Mettler ToledoDL15


• Alkalinity

Some titrators are designed specifically to measure alkalinity.

• Alkalinity and acidity

Some titrators are designed to measure both acidity and alkalinity.

B Potentiometricin a potentiometric titration, no indicator is used.

instead, the voltage across the analyte (typically an electrolyte solution) is measured.

d Acid/basethe acidity or alkalinity of a solution may be determined using a classic acid/base titration.

e Other modestitrators can also be designed to analyze single elements such as sulfur or chlorine.

c Stat titrationph-stat titration is applicable to any bioreaction

involving ph variations. the main application of ph-stat titration has traditionally been nitrification monitoring, however it may also be used to monitor any reaction involving the production or consumption of protons, hydroxyl ions, or inorganic carbon chemical species.

most titrators offer one type of analysis, whether it is Karl Fischer, potentiometric or another type. these titrators are suitable for most purposes in which the same types of analyses are performed multiple times.

SIngle mode

• Mono burette

titrators with a single burette are adequate for many standard laboratory applications.

• Mono burette


• Bi burette

more than one burette may be useful for certain analyses (back titration, for example) or when rapid turnover is required.

• Bi burette


• Acidity

Some titrators are designed specifically to measure acidity.


GR ScientificAquamax TAN




• Compact titrator

in situations where space is limited, a compact titrator can be the ideal choice.

• Standard titrator

Standard titrators tend to have greater functionality and sample capacity than compact versions and may be more appropriate when space is not an issue.

COSA InstrumentsCA-200

Metrohm852

Hiranuma/JM ScienceAQV-2200C

Analytik JenaPocket titrator

Analytik JenaAQUA 40.00

Metrohm831

Mettler ToledoC30

Hiranuma/JM ScienceAQ-300

COSA InstrumentsCA-21

Metrohm851

GR ScientificAquamax KF Coulometric



Hitachi High-TechAQ-300

Mettler ToledoC20

Denver Instruments260

SI AnalyticsTitroLine KF trace

Metrohm756

Hitachi High-TechAQ-2200





A Karl FischerKarl Fischer titration is a classic titration method in analytical chemistry used to determine trace amounts of water in a sample. it can be used for determining the water content in fluids, solids, pasty

substances, oils and gases. Karl Fischer titration can use either a coulometric or volumetric technique and is highly accurate with a high selectivity for water.

2 Coulometric in coulometric Karl Fischer titration, the titrant is generated electrochemically in the titration

cell. the coulometric method measures water levels much lower than the volumetric method.

3 Volumetric and coulometric if both volumetric and coulometric titrations are required on a regular basis, the preferred

option may be to select a single titrator that can operate in both modes.

Mettler ToledoV20

COSA InstrumentsKF-21

Hiranuma/JM ScienceAQV-300

Mettler ToledoV30



Metrohm870 Titrino Plus



Hitachi High-TechAQV-2200





1 Volumetricin volumetric Karl Fischer titration, the titrant is added directly to the sample via a burette.

the moisture content of the sample is determined from the titration volume.

SI AnalyticsTitroLine KF


Hitachi High-TechAQV-300

Metrohm890KF Titrando

GR ScientificAquamax KF Volumetric

Metrohm901 Titrando

• Mono burette


• >1 burette






Hiranuma/JM ScienceCOMM-300A





• No Karl Fischer option

titrators used in the analysis of food and drink, for example, may be required to analyze a whole range of factors including chloride, acid and water content. these titrators can be considered 'multi-parameter' systems.

B StandardStandard titrators tend to have greater functionality and sample capacity than compact versions and may be more

appropriate when space is not an issue.

A Compactin situations where space is limited, a compact titrator can be the ideal choice.

multI-pArAmeter SyStem

Mettler ToledoDL22

JASCOATS-429

MantechRapidDuo


SI AnalyticsTitroLine Easy

MantechPC-Titrate

MantechTitraSip SA


MantechQC-Titrate

Mettler ToledoG20

SI AnalyticsTitroLine alpha plus

Cosa InstrumentsGT-100

• Karl Fischer option

Some multiparameters also include the option for KF titration, either through an integral unit or through an optional add-on.

• Specifically for food and drink analysis

Some titrators are specially designed to include the parameters required for the analysis of food and drink, including wine; for example, analysis of salt, water, acid and fat.

• Comprehensive analysis (excluding KF)

Some titrators include a full range of sophisticated analyses including any combination of titration and ion analysis, conductivity analysis, turbidity analysis, color analysis and spectrophotometric analysis for a fully comprehensive system.







STARTHERE

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