For example, some pollutants, though not directly harmful to human health under certain concentrations, may cause odor, color difference, foam and oil film, which will impede the normal use of water. Copper, zinc, nickel and other substances in a certain concentration can inhibit the growth and reproduction of microorganisms, thus affecting the decomposition and biological oxidation of organic matter in water, reducing the self purification ability of water body and affecting the sanitary condition of water body.<br>
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