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 Four test methods are included as follows:
|
| Concentration | Sections |
| Test Method A—Atomic Absorption, | 0.05 to 2.0 mg/L | 7 to 15 |
| Test Method B—Atomic Absorption, | 5 to 200 μg/L | 16 to 24 |
| Test Method C—Differential Pulse | 1 to 100 μg/L | 25 to 34 |
| Test Method D—Atomic Absorption, | 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.
