形态分析、生物可给性与生态毒理研究

Study on Speciation Analysis, Bioavailability and Ecotoxicology

阐明了分级萃取过程中存在萃取剂的非选择性及痕量金属元素在萃取过程中的再吸附与再分配问题。实验证明了不同土壤类型与不同元素形态决定不同的生物可给性。采用植物根际分泌的低分子量有机酸作萃取剂 ,可较好地预测金属形态与生物可给性的关系。基于腐殖酸的结构柔性、多官能团性与聚电解质性 ,发展了多配位体表面络合模型 ,并用于研究界面反应。建立了新的青海湖菌Q6 7生物毒性测试方法 ,可应用于淡水体系。根据硒在环境 (水、土壤、植物、动物 )中的不同形态 。

Nonselectivity of extractants used, readsorption and redistribution of trace metals among geochemical phases during extraction processes have been elucidated. Bioavailability of various elements is dependent on the type of soils and their elemental speciations. The correlation between elemental speciation and plant availability can be predicated by using low-molecular-weight-organi-acids exuded by plant roots as an extractant. A simple multi-ligands surface complexation model was developed in the studies for metal-humic acid interactions, which has been taken into account for the structure flexibility, multi-functional groups and polyelectrolytes characteristics of natural derived humic acids. Vibrio qinghaiensis Nov.-Q67, which is a new type of luminobacteria and emits luminescence under fresh water conditions, was exploited as a tool in a new bioassay, which permits the studies of relationship between the speciation and toxicity. Selenium deficiency and the etiology of selenium response diseases were explained on the basis of selenium speciation in food chain processes and in human plasma.