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State Water Resources Control Board <br />Division of Water Quality <br />GAMA Proaram <br />ANALYTICAL INFORMATION <br />Analytical Test Method <br />US EPA Methods: 200.7 (ICP), 200.8 (ICP/MS), 200.9 <br />(GFAA), and EPA 1632 (FAAS). <br />Detection Limit <br />Most methods can attain the State -required minimum <br />detection level of 2 pg/L for drinking water. EPA Methods <br />200.8 and 200.9 have detection limits of 0.1 and 0.5 <br />pg/L. Gaseous/Hydride Atomic Absorption Spectrometry <br />(EPA Method 1632), is able to achieve detection and <br />speciation of arsenic components present in samples at <br />0.003 pg/L level. <br />Known Limitations to <br />Few laboratories are equipped to conduct ICP -MS <br />Analytical Methods <br />analysis necessary for low detection limit quantification <br />and speciation. Sample handling and preservation <br />methods differ for different analytical methods. No single <br />method is appropriate for all sample matrices, but <br />preservation is very important due to speciation <br />concerns. Sulfide interference may occur in field-testing <br />methods (colorimetric). Sample filtration may be done <br />but is not required. <br />Public Drinking Water <br />Arsenic is a regulated chemical for drinking water <br />Testing Requirements <br />sources, with monitoring and compliance requirements <br />(Title 22, Section 64431, et seq.). <br />Revised October 2017 <br />