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levels in waste water. It has since expanded to a common method of comparison of the intensity of yellow-tinted samples. It is specific to the color yellow and is based on dilutions of a 500
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platinum cobalt solution. The colour produced by one milligram of platinum cobalt dissolved in one liter of water is fixed as one unit of colour in platinum-cobalt scale. The
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has detailed description and procedures in ASTM Designation D1209, "Standard Test Method for Color of Clear
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Designation D1209-00, "Standard Test Method for Color of Clear
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Colour may be reported on a water quality report using this scale.
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Hazen, A., "The
Measurement of the Colors of Natural Waters,"
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32:(1869–1930). The index was developed as a way to evaluate
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