估算天津环境中γ-HCH归宿的逸度模型

以全天津市为研究区域,利用稳态假设的逸度模型,用Matlab软件计算了γ-HCH(林丹)在环境各相中的浓度和相间迁移通量.γ-HCH在天津气、水、土壤、沉积物、鱼、作物、蔬菜各相中的浓度分别为1.57×10^-11、7.95×10^-7、1.17 × 10^-4、4.58×10^-4、6.03×10^-4、1.60×10^-4和6.42×10^-5mol/m³,在数量级上与实测值吻合很好.估算结果表明农业施用和农药厂废水是该地区环境中γ-HCH最主要的来源,最大的汇是土壤和沉积相(占环境中总量的99%),最主要的迁移过程是水-沉、气-土的扩散和沉降,土壤和沉积物中的降解是γ-HCH消失的最主要途径.

Evaluating the fate of gamma-HCH using fugacity model in Tianjin environment

This study taking Tianjin as the study area calculated the concentration and transfer flux of gamma-HCH in all bulks using Matlab based on the assumption of steady state fugacity model. The calculated values agree well with the observed values, the concentrations of gamma-HCH in air, water, soil, sediment, fish, crop, and vegetable were 1.57 x 10(-11), 7.95 x 10(-7), 1.17 x 10(-4), 4.58 x 10(-4), 6.03 x 10(-4), 1.60 x 10(-4), 6.42 x 10(-5) mol/m3 respectively. The result indicated that the main source of gamma-HCH was agricultural application and wastewater from pesticide industries, the biggest bulk sinks were soil and sediment (accounting for 99% of total amount in the environment). Among all transfer processes deposition and diffusion on the water-sediment and air-soil interface were the primary, and mineralization was the key route for gamma-HCH to disappear in the environment.