COLOR:
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Pure water is colorless, but water in nature is often colored by foreign
substances.
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Color caused by suspended matter is defined as apparent color and can be
removed by filtration.
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Color caused by dissolved matter is defined as true color.
Sources:
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After contact with organic debris such as leaves, conifer needles, weeds, wood,
water picks up tannins, humid acid and humates and takes on yellowish-brown
hues.
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Iron oxides cause reddish water.
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Manganese oxide cause blackish water.
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Industrial wastes from textile and dyeing operations, pulp and paper
production, food processing, chemical production, mining, refining and
slaughterhouse operations may add substantial coloration to water in receiving
streams.
Use:
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Color is not a parameter usually included in wastewater analysis.
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In potable water analysis, the common practice is to measure only the true
color produced by organic acid
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