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View Actual EPA Method 7420 (PDF File)
EPA Method 7420:LEAD (ATOMIC ABSORPTION, DIRECT ASPIRATION)
Summary:(From EPA 7000) Metals in solution may be readily determined by flame (direct aspiration) atomic absorption spectrophotometry. The method is simple, rapid, and applicable to a large number of environmental samples including, but not limited to, ground water, aqueous samples, extracts, industrial wastes, soils, sludges, sediments, and similar wastes. With the exception of the analyses for dissolved constituents, all samples require digestion prior to analysis (see Chapter Three). Analysis for dissolved elements does not require digestion if the sample has been filtered and then acidified.
Scope:See Section 1.0 of Method 7000.
Report Number:SW-846 Ch 3.3