农田土壤中邻苯二甲酸酯临界浓度的研究

Study on Threshold Concentrations of Phthalic Acid Esters in Agricultural Soil

[目的]为完善土壤有机污染物质量标准。[方法]采用制定土壤质量指导值/标准通用的暴露风险评价方法,对农田土壤中邻苯二甲酸酯的临界浓度进行初步的推算。[结果]DBP、DEHP、DEP和BBP 4种邻苯二甲酸酯的临界浓度分别为250、50、2000、500 mg/kg。[结论]利用暴露风险评价模型推算的土壤邻苯二甲酸酯临界浓度远低于我国工业企业土壤环境质量风险评价基准中的相应污染物标准,但远高于美国的土壤标准。这可能与模型参数的取值和邻苯二甲酸酯的参考剂量有很大关系。

[Objective] The research aimed to improve the standards for soil environmental quality on organic pollutants.[Method] The exposure risk model extensively employed to derive guidelines/standards was used to calculate threshold concentrations of phthalic acid esters in agricultural soil.[Result] The threshold concentrations of DBP,DEHP,DEP and BBP were 250,50,2000,500 mg/kg,respectively.[Conclusion] The threshold concentrations of phthalic acid esters calculated by exposure risk model was obviously lower than related standard from environmental quality risk assessment criteria for manufacturing facilities in China,and obviously higher than related soil standard proposed by USA.The results were probably related with model parameters and reference dose of phthalic acid esters.