工业的发展使得环境中有害化学物质的种类和含量剧增;相对而言,试图减少这种污染的措施费用太大而不实际。鉴于目前已有非常灵敏的测定方法,可测知环境中远低于致毒量的化学有害物的浓度;也了解到生物对低浓度的重金属和杀虫剂等具有适应能力,而且慢性适应较急性时更能耐受较大的毒物剂量,因此,我们很有必要确定各种化学有害物的浓度和 Industrial development has led to a dramatic increase in the types and levels of harmful chemicals in the environment; in contrast, attempts to reduce such pollution are costly and impractical. In view of the very sensitive measurement methods currently available, the concentrations of chemical pests far below the toxic levels in the environment can be measured. It is also known that organisms have the ability to adapt to low levels of heavy metals and insecticides, etc., and that chronic adaptation is more acute When more tolerate a larger dose of poison, therefore, we need to determine the concentration of various chemical pests and