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本文提出滴滴涕(DDT)的环境接触量可用农田土壤DDT的实际含量来表示,此量应等于当年的施用量与土壤中累积的残留量之和。为求得历年土壤DDT的实际含量,施用量可用有历史记录的销售量表示,残留量可按DDT在土壤中的降解规律求出。如将DDT的此种推算值逐年列出,即可视之为DDT的历史性环境接触量。本文用此法求出了天门县的有关数据,并用当地土壤和鸡体与人体脂肪中DDT的测定值作了验证。
This paper proposes that the environmental exposure of DDT can be expressed as the actual content of DDT in farmland, which should be equal to the sum of the application of the year and the residual amount accumulated in the soil. In order to obtain the actual content of DDT in soil over the years, the application rate can be expressed by the sales volume with historical records. The residue can be calculated according to DDT degradation law in the soil. DDT such projections will be listed as a year, it can be regarded as the history of DDT exposure to the environment. In this paper, we obtained the data of Tianmen County and verified the DDT values in the soil and body fat of the local soil.