Determination of Lead in Drinking Water. What Is Lead? Lead is one of the heavy metals that puts...
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Transcript of Determination of Lead in Drinking Water. What Is Lead? Lead is one of the heavy metals that puts...
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 for non-infectious diseases, those illnesses associated with toxic chemical pollution.
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.
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.
Who Regulates the Concentration Limits?
• Safe Drinking Water Act (SDWA)– through the Environmental Protection
Agency (EPA)
Experimental Apparatus
Graphite Furnace Atomic Absorption
Spectrophotometer•
Hallow Cathode Lamp
Pyrocoated Graphite Furnace (Tube)
Sample Carousel
Motor Driven Sampling Arm
The Instrument Is Computer-controlled and Provides Automation
to Most Steps of the Analysis.
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.
Method and Procedure Data Book
Water Samples&
Calibrated Standards
Absorbance vs Time = ppb Concentration (peak area)
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
The end