1.1These test methods2 cover the photometric and atomic absorption determination of arsenic in most waters and wastewaters. Three test methods are given as follows:

	Concentration Range	Sections
Test Method A-Silver Diethyldithio- carbamate Colorimetric	5 to 250 μg/L	7 to 16
Test Method B-Atomic Absorption, Hydride Generation	1 to 20 μg/L	17 to 26
Test Method C-Atomic Absorption, Graphite Furnace	5 to 100 μg/L	27 to 36

1.2The analyst should direct attention to the precision and bias statements for each test method. It is the user's responsibility to ensure the validity of these test methods for waters of untested matrices.

1.3The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard.

1.4This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements, see 11.1 and 20.2.