污染农业土壤中微量有机物的活性和生物有效性

Behavior of organochlorine pesticides (OCPs) and PAHs in soil-plant system was investigated in Tianjin area. Procedures for determing the chemicals in soil and plant samples based on accecelarate solvend extraction (ASE) method were developed. The influence of natural occorring water soluble (WSOC) and insoluble organic (WIOC) carbon on the mobility and bioavailability of OCPs and PAHs was studied. A model for predicting toxicity of organic chemicals was estiblished. Ecological toxicity of PAHs in wastewater irrigated agricltral area of Tianjin was evaluated. It was found that ASE procedure is efficient for such study. WSOC and WIOC affect the bioavailability of OCPs and PAHs in the opposite directions. Benzo(a)pyrene is the most toxic PAHs in the study area in term of ecological risk.

土壤污染对食物安全和人体健康构成威胁。与其它污染物相比，微量有机物更具潜在危害。本项目拟采用现场实测、室内模拟和栽培实验等手段，研究多环芳烃和氯代烃在受污染耕作土壤-作物系统中的形态、迁移特征、生物活性、降解和迁移动力学以及影响上述行为的因亍Ｑ芯砍晒唤鼍哂欣砺奂壑担部晌乐刮廴居跋臁⒎⒄够指醇际跆峁├砺垡谰荨