单体稳定碳同位素分析多氯联苯和多溴联苯醚的转化机理

项目名称： 单体稳定碳同位素分析多氯联苯和多溴联苯醚的转化机理

项目编号： No.41503084

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 地质学

项目作者： 曾艳红

作者单位： 中国科学院广州地球化学研究所

项目金额： 22万元

中文摘要： 多氯联苯（PCBs）和多溴联苯醚（PBDEs）等持久性有机污染物在环境中具有复杂的转化过程，但目前对其不同转化过程的机理研究十分缺乏。单体稳定同位素分析（CSIA）是近二十年发展起来的一项新技术，在环境科学领域广泛应用于有机污染物的源解析及转化过程的示踪。本研究拟以PCBs和PBDEs为目标化合物，通过实验室内模拟目标化合物的光降解和生物转化过程，结合单体稳定碳同位素组成分析和污染物的定性定量分析，了解单体稳定碳同位素组成变化与目标化合物不同作用机制的内在联系，探讨应用CSIA技术分析目标化合物不同转化过程的可能。本项目的完成，对于认识PCBs和PBDEs不同转化过程的作用机理、科学评价PCBs和PBDEs的环境暴露风险具有重要意义。

中文关键词： 单体稳定碳同位素分析；多氯联苯；多溴联苯醚；转化机理

英文摘要： Polychlorinated biphenyls (PCBs) and polybrominated diphenyl ethers (PBDEs) are two kinds of highly concerned organic pollutants, which have complex transformation processes in the environment. However, there are large gaps in our understanding on the transformation mechanism of these pollutants. Compound-specific stable isotope analysis (CSIA) is a new analytical technology developed in the last 20 years which has been applied mainly to degradation and source identification of organic pollutants in the environment. Therefore, we attempt to investigate the different transformation processes, including photodegradation and biotransformation of PCBs and PBDEs based on laboratory experiments. The alternations in contaminant’s congener profiles and the stable carbon isotope compositions of individual PBDE/PCB congener will be determined in both photodegradation and vitro hepatic biotransformation. The variations of stable carbon isotope composition of the target compounds will be assessed to explore the nature functional mechanisms of different metabolic processes. Our specific objectives are to develop a method to characterise the different transformation processes of PCBs and PBDEs by CSIA. This project will improve the understanding on the different transformation mechanisms of PCBs and PBDEs and play a substantially important role in evaluating the environmental risk of these pollutants correctly.

英文关键词： Compound-specific stable carbon isotope analysis;polychlorinated biphenyls;polybrominated diphenyl ethers; transformation mechanisms