This method is for the determination of color of water derived from naturally occurring materials, i.e., vegetable residues such as leaves, barks, roots, humus and peat materials. The method is not applicable to color measurement on waters containing highly colored industrial wastes. Color is measured by a visual comparison of the sample with platinum-cobalt standards. One unit of color is that produced by 1 mg/L platinum in the form of the chloroplatinate ion.
Slight amounts of turbidity can interfere with the determination so samples showing turbidity should be clarified via centrifuge. The method is pH dependent.
The spectrophotometric and tristimulus methods are useful for detecting specific color problems. The use of these methods, however, is laborious and unless determination of the hue, purity, and luminance is desired, they are of limited value.
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| Hold Times, Preservatives, Preps, Collection, Analytical & Documentation | |
|---|---|
| Holding Time: | 48 hours from sample collection to analysis. |
| Preservatives: | Refrigerate samples at 4°C. |
| Required Preps: | 250 mL HDPE bottle with Teflon-lined lid |
| Collection Method: | Grab sampling |
| Analytical Methodology: | Spectrophotometer |
| Documentation: | 
110.2
|
| Analyte | Formula | CAS Number | Detection Limit | |
|---|---|---|---|---|
| Color | 1 |
CU | ||
* The analytes and detection limits listed for each method represent the typical detection limits and analytes reported for that particular method. Keep in mind that analyte lists may vary from laboratory to laboratory. Detection limits may also vary from lab to lab and are dependent upon the sample size, matrix, and any interferences that may be present in the sample.