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^ The history of arsenic regulation, Southwest Hydrology, May/June 2002, p.16.
^ EPA announces arsenic standard for drinking water of 10 parts per billion, EPA press release, 10/31/2001.
*20 Megan A. Ferguson and others, Lowering the detection limit for arsenic: implications for a future practical quantitation limit, American Water Works Association Journal, Aug. 2007, p.92-98.