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View Actual EPA Method 7472 (PDF File)
EPA Method 7472:MERCURY IN AQUEOUS SAMPLES AND EXTRACTS BY ANODIC STRIPPING VOLTAMMETRY (ASV)
Summary:Standards and samples are made 0.1 M in Cl- and are rendered electrically conductive by adding concentrated hydrochloric acid (HCL) or solid sodium chloride (NaCl). Hg(II) is quantified by anodic stripping, at a potential of +500 mV with respect to an saturated calomel electrode (SCE), from a gold metal film deposited on a glassy carbon electrode (GCE).
Scope:This method is applicable for laboratory determinations of dissolved organic and inorganic divalent mercury ions and compounds (Hg(II)) in drinking water, natural surface water, seawater, in domestic and industrial wastewater, and in aqueous soil extracts. Solid matrices must be solubilized by acid digestion prior to quantitation by ASV.
Report Number:SW-846 Ch 3.3