ASTM D3557 – Standard Test Methods for Cadmium in Water
Description:
Significance and Use
4.1 The test for cadmium is necessary because it is a toxicant and because there is a limit specified for cadmium in potable water in the National Interim Primary Drinking Water Regulations. This test serves to determine whether the cadmium content of potable water is above or below the acceptable limit.
Scope
1.1 These test methods cover the determination of dissolved and total recoverable cadmium in water and wastewater by atomic-absorption spectrophotometry and differential pulse anodic stripping voltammetry.2 Section 44 on Quality Control pertains to these test methods. Four test methods are included as follows:
| Concentration Range | Sections | |
| Test Method A—Atomic Absorption, Direct | 0.05 to 2.0 mg/L | 7 to 15 |
| Test Method B—Atomic Absorption, Chelation-Extraction | 5 to 200 μg/L | 16 to 24 |
| Test Method C—Differential Pulse Anodic Stripping Voltammetry | 1 to 100 μg/L | 25 to 34 |
| Test Method D—Atomic Absorption, Graphite Furnace | 2 to 10 μg/L | 35 to 43 |
1.2 Test Method B can be used to determine cadmium in brines. It is the user’s responsibility to ensure the validity of these test methods for waters of untested matrices.
1.3 ICP-MS or ICP-AES may also be appropriate but at a higher instrument cost. See Test Methods D5673 and D1976.
1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversion to inch-pound units that are provided for information only and are not considered standard.
ASTM D3552