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APHA color is a color standard named for the American Public Health Association and defined by ASTM D1209. It was originally intended to describe the color of waste water, but its usage has expanded to include other industrial applications.
It is similar to the HAZEN colour test, which uses a PtCo solution and was developed for water treatment facilities where the Color of water could be used as a measure of concentration of dissolved and particulate material. Slight discolouration is measured in Hazen units (HU) Impurities can be deeply coloured as well, for instance dissolved organic compounds called tannins can result in dark brown colours.
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