Because of their toxicity, at present there are only a few applications of foreign and domestic are still widely used.
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Because of their high toxicity for human health, heavy mental concentrations in wastewater are restricted by strict standards.
由于镉类重金属对人类的极大危害性，废水标准中关于重金属浓度的排放是非常严格的。
Pollutants such as aldehyde and ketone, among major pollutants in atmosphere environment, are strictly limited by every nation for their discharges because of their high toxicity and numerous sources.
醛、酮类污染物是环境中的主要污染物之一，其来源广、毒性大，各国对其排放都进行了严格的限制。
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