EPA-NERL: 110.3: Color by Spectrophotometry
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Official Method Name
|
Color by Spectrophotometry |
|---|---|
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Current Revision
| Issued 1974 |
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Media
|
WATER |
|
Instrumentation
|
Spectroscopy (Colorimetry; Photometry) |
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Method Subcategory
|
Inorganic |
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Method Source
|
|
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Citation
|
|
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Brief Method Summary
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Color characteristics are measured at pH 7.6 and at the original pH by obtaining the visible absorption spectrum of the sample on a spectrophotometer. The percent transmission at certain selected wavelengths is used to calculate the results. |
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Scope and Application
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This method determines color in drinking, surface, and saline waters; domestic and industrial wastes. It must be used for industrial wastes that cannot be determined by the Platinum-Cobalt method. |
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Applicable Concentration Range
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Not Available. |
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Interferences
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Turbidity: Since very slight amounts of turbidity interfere with the determination, samples must be filtered before analysis. |
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Quality Control Requirements
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None. |
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Sample Handling
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Refrigerate at 4oC. |
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Maximum Holding Time
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48 hours (MCAWW, Table 1). |
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Relative Cost
|
Less than $50 |
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Sample Preparation Methods
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None. |
