4.1 Elemental constituents in potable water, receiving water, and wastewater need to be identified for support of effective pollution control programs. Test Methods A, B, and C provide the techniques necessary to make such measurements.
4.2 Nickel is considered to be relatively nontoxic to man and a limit for nickel is not included in the EPA National Interim Primary Drinking Water Regulations.6 The toxicity of nickel to aquatic life indicates tolerances that vary widely and that are influenced by species, pH, synergistic effects, and other factors.
4.3 Nickel is a silver-white metallic element seldom occur-ring in nature in the elemental form. Nickel salts are soluble and can occur as a leachate from nickel-bearing ores. Nickel salts are used in metal-plating and may be discharged to surface or ground waters.
1.1 These test methods8201;2,8201;3,8201;4 cover the atomic absorption determination of nickel in water and wastewaters. Three test methods are given as follows:
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| Concentration | 8201; |
| Test Method A—Atomic Absorption, 8199;Direct | 8199; | 8199; |
| Test Method B—Atomic Absorption, 8199;Chelation-Extraction | 8199; | 8199; |