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View Actual EPA Method 206.3 (PDF File)
EPA Method 206.3:Arsenic by Gaseous Hydride Generation and AA. Official Name: Arsenic (Atomic Absorption - Gaseous Hydride)
Summary:Arsenic in a sample is first reduced to the trivalent form using stannous chloride, and converted to arsine (arsenic tri-hydride) using zinc metal. The gaseous hydride is swept into an argon-hydrogen flame of an atomic absorption spectrophometer and measured.
Scope:This method determines inorganic arsenic in drinking water and most fresh and saline waters in the absence of high concentrations of chromium, cobalt, copper, mercury, molybdenum, nickel, and silver.
Citation:Methods for the Chemical Analysis of Water and Wastes (MCAWW) (EPA/600/4-79/020)
Interferences:For interferences see EPA Methods 200.0 and 206.5.
QC Requirements:Spike industrial waste samples with a known amount of arsenic to establish adequate recovery. QC requirements for drinking water procedures are provided in method 200.0.
Maximum Holding Time:6 months (MCAWW, Table 1).
Media:WATER
Subcategory:Inorganic
Concentration:2-20 ug/L (working range).
Sample Prep:200.0, 206.5
Precision:Precision and accuracy values were calculated using interlaboratory data from EPA-managed Water Pollution (WP) performance evaluation studies.
Detection:The DL is to be considered the minimum working limit achievable with this method.
Revision Number:Issued 1974