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Determination of Lead in Drinking Water

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Page 1: Determination of Lead in Drinking Water. What Is Lead? Lead is one of the heavy metals that puts enormous risk to human health and is a major determinant

Determination of Lead in Drinking Water

Page 2: Determination of Lead in Drinking Water. What Is Lead? Lead is one of the heavy metals that puts enormous risk to human health and is a major determinant

What Is Lead?

• Lead is one of the heavy metals that puts enormous risk to human health and is a major determinant for non-infectious diseases, those illnesses associated with toxic chemical pollution.

Page 3: Determination of Lead in Drinking Water. What Is Lead? Lead is one of the heavy metals that puts enormous risk to human health and is a major determinant

Where Is Lead Found?

• Lead can be found in natural deposit, and is commonly used in household plumbing and water service lines. Lead enters tap water through corrosion of plumbing materials.

Page 4: Determination of Lead in Drinking Water. What Is Lead? Lead is one of the heavy metals that puts enormous risk to human health and is a major determinant

What Is the Limited Concentration of Lead in

Potable Water?

• The amount of lead concentration limited in drinking water is 15 ppb (parts per billion) or 15 g/l of water.

Page 5: Determination of Lead in Drinking Water. What Is Lead? Lead is one of the heavy metals that puts enormous risk to human health and is a major determinant

Who Regulates the Concentration Limits?

• Safe Drinking Water Act (SDWA)– through the Environmental Protection

Agency (EPA)

Page 6: Determination of Lead in Drinking Water. What Is Lead? Lead is one of the heavy metals that puts enormous risk to human health and is a major determinant

Experimental Apparatus

Page 7: Determination of Lead in Drinking Water. What Is Lead? Lead is one of the heavy metals that puts enormous risk to human health and is a major determinant

Graphite Furnace Atomic Absorption

Spectrophotometer•

Page 8: Determination of Lead in Drinking Water. What Is Lead? Lead is one of the heavy metals that puts enormous risk to human health and is a major determinant

Hallow Cathode Lamp

Page 9: Determination of Lead in Drinking Water. What Is Lead? Lead is one of the heavy metals that puts enormous risk to human health and is a major determinant

Pyrocoated Graphite Furnace (Tube)

                            

Page 10: Determination of Lead in Drinking Water. What Is Lead? Lead is one of the heavy metals that puts enormous risk to human health and is a major determinant

Sample Carousel

Page 11: Determination of Lead in Drinking Water. What Is Lead? Lead is one of the heavy metals that puts enormous risk to human health and is a major determinant

Motor Driven Sampling Arm

Page 12: Determination of Lead in Drinking Water. What Is Lead? Lead is one of the heavy metals that puts enormous risk to human health and is a major determinant

The Instrument Is Computer-controlled and Provides Automation

to Most Steps of the Analysis.

Page 13: Determination of Lead in Drinking Water. What Is Lead? Lead is one of the heavy metals that puts enormous risk to human health and is a major determinant

The method to identify the experiment is called 239_2_pbA_100 and is the standard method used for the GFAAS. This method is approved

by the EPA and regulated by the

SDWA.

Page 14: Determination of Lead in Drinking Water. What Is Lead? Lead is one of the heavy metals that puts enormous risk to human health and is a major determinant

Method and Procedure Data Book

Page 15: Determination of Lead in Drinking Water. What Is Lead? Lead is one of the heavy metals that puts enormous risk to human health and is a major determinant

Water Samples&

Calibrated Standards

Page 16: Determination of Lead in Drinking Water. What Is Lead? Lead is one of the heavy metals that puts enormous risk to human health and is a major determinant

Absorbance vs Time = ppb Concentration (peak area)

Page 17: Determination of Lead in Drinking Water. What Is Lead? Lead is one of the heavy metals that puts enormous risk to human health and is a major determinant

Water Samples Lead Concentration

1st Draw = 12.0 ppb Mean = 11.7 ppb or g/L

11.4 ppb

2nd Draw = 0.119 ppb Mean = 0.265ppb or g/L

0.412 ppb

Page 18: Determination of Lead in Drinking Water. What Is Lead? Lead is one of the heavy metals that puts enormous risk to human health and is a major determinant

The end