Effects of several key hydrochemical factors on toxicity of typical heavy metals to aquatic organisms
In order to clarify the effects of different hydrochemical conditions on the toxicity of heavy metals to aquatic organisms,this study investigated the influence of four primary hydrochemical factors,i.e.,pH,hardness,temperature,and organic carbon(OC),on the acute and chronic toxicity of four typical heavy metals to different taxon of aquatic organisms.The results showed the effects of individual hydrochemical factors on the toxicity of different metals differ.The increases in hardness and OC were found to reduce the toxicity of metals to fish,whereas the increase in temperature enhanced the toxicity to both fish and insects.The impact of individual hydrochemical factors varied for different taxon of organisms.When considering the combined effects of these factors,the effects of acute toxicity and chronic toxicity to aquatic organisms were significantly different.OC might be an important factor affecting toxicity.
heavy metalsaquatic organismshydrochemical factorstoxicityimpact
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