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hydroquinone.enols can give an unacceptable taint to water and fish, particularly chlorophenols that are shaped from the chlorination of phenols. Phenols happen in surface waters from discharges of industrial effluents, particularly from the thermal processing of coal, from petroleum refineries, and from the production of artificial fabrics. The utmost admissible lead concentration in water is 0.004 to zero.008 mg per litre for salmonids and zero.07 mg per litre for cyprinids.Acute lead toxicity is characterised initially by injury to the gill epithelium; the affected fish are killed by suffocation. Also, the toxicity of lead is thought to be lowered with

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