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