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Significance and Use
4.1 Copper is found in naturally occurring minerals principally as a sulfide, oxide, or carbonate. It makes up approximately 0.01 % of the earth's crust and is obtained commercially from such ores as chalcopyrite (CuFeS2). Copper is also found in biological complexes such as hemocyanin.
4.2 Copper enters water supplies through the natural process of dissolution of minerals, through industrial effluents, through its use, as copper sulfate, to control biological growth in some reservoirs and distribution systems, and through corrosion of copper alloy water pipes. Industries whose wastewaters may contain significant concentrations of copper include mining, ammunition production, and most metal plating and finishing operations. It may occur in simple ionic form or in one of many complexes with such groups as cyanide, chloride, ammonia, or organic ligands.
4.3 Although its salts, particularly copper sulfate, inhibit biological growth such as some algae and bacteria, copper is considered essential to human nutrition and is not considered a toxic chemical at concentrations normally found in water supplies.
A—Atomic Absorption, Direct
0.05 to 5 mg/L
B—Atomic Absorption, Chelation-Extraction
50 to 500 μg/L
C—Atomic Absorption, Graphite Furnace
5 to 100 μg/L
1.2 Either dissolved or total recoverable copper may be determined. Determination of dissolved copper requires filtration through a 0.45-μm (No. 325) membrane filter at the time of collection. In-line membrane filtration is preferable.
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are mathematical conversions and may not be exact equivalents; therefore, each system shall be used independently of the other.
1.4 This 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 Note 4, Note 6, Note 10, and Note 16.
1.5 Three former photometric test methods were discontinued. Refer to Appendix X1 for historical information.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D858 Test Methods for Manganese in Water
D1066 Practice for Sampling Steam
D1068 Test Methods for Iron in Water
D1129 Terminology Relating to Water
D1193 Specification for Reagent Water
D1687 Test Methods for Chromium in Water
D1691 Test Methods for Zinc in Water
D1886 Test Methods for Nickel in Water
ICS Number Code 13.060.50 (Examination of water for chemical substances)
UNSPSC Code 41115407(Atomic absorption AA spectrometers)
ASTM D1688-12, Standard Test Methods for Copper in Water, ASTM International, West Conshohocken, PA, 2012, www.astm.orgBack to Top