Abstract
Abstract Studies were made of the effects of additions of a sewage effluent, an amino acid, humic substances, and suspended organic matter on the acute lethal toxicity of water containing copper sulphate to rainbow trout. In all cases the toxicity of a given total concentration of copper was quantitatively reduced. It was concluded that neither the total concentration of copper nor that of “soluble” copper in a water could be used to determine the toxicity to fish which was attributable to copper. It was also concluded that data from toxicity tests with copper in which natural surface waters are used for dilution purposes cannot define the true toxicity of copper or have application to other natural waters except when the concentrations of the toxic chemical species are known.
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