USGS Test Method I-2403


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Source:
USGS

Method Name:
Lead, dissolved in water by GFAA. Official Name: Lead, atomic absorption spectrophotometry, graphite furnace

Description:
Lead is determined by atomic absorption spectrophotometry in conjunction with a graphite furnace containing a graphite platform (Hinderberger and others, 1981). A sample is placed on the graphite platform, and a matrix modifier is added. The sample then is evaporated to dryness, charred, and atomized using high-temperature ramping. The absorption signal produced during atomization is recorded and compared with standards.

Scope:
This method is used to determine lead in samples of water with a specific conductance not greater than 10,000 uS/cm. With Zeeman background correction and a 20-uL sample, the method is applicable in the range from 1 to 25 ug/L.

Citation:
M.J. Fishman, 1993, Methods of analysis by the U.S. Geological Survey National Water Quality Laboratory--Determination of inorganic and organic constituents in water and fluvial sediments: U.S. Geological Survey Open-File Report 93-125

Interferences:
Interferences for samples with specific conductances less than 10,000 uS/cm normally are small. In addition, the use of the graphite platform reduces the effects of many interferences. Special precautionary measures to prevent contamination need to be used during sample collection and laboratory determination.

QC Requirements:
Calibrate instrument using calibration standards (CAL). Quality control samples (QCS) and laboratory blanks (LB) analyzed at a minimum of I each after every 10 samples

Maximum Holding Time:
180 days

Media:
WATER

Subcategory:
Inorganic

Concentration:
1 to 25 ug/L

Precision:
-

Detection:
-

Revision Number:
1989

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