中华圆田螺对沉积物中十溴联苯醚工业品DE-83的生物积累与转化
作者简介:
田胜艳(1974-),女,博士,研究方向为持久性有机物污染物的生物有效性,E-mail:tiansy@tust.edu.cn
- 1. 天津科技大学海洋科学与工程学院天津市海洋资源与化学重点实验室, 天津 300457;
- 2. 南开大学环境科学与工程学院教育部环境污染过程与基准重点实验室天津城市生态环境修复与污染防治重点实验室, 天津 300071
摘要: 为研究沉积物中十溴联苯醚(BDE-209)的生物有效性,将淡水生态系统中常见的底栖动物中华圆田螺(Cipangopaludina cahayensis)暴露于商品DE-83(主要包含92%的BDE-209、6%的BDE-206、1.5%的BDE-207和0.5%的BDE-208)染毒的沉积物,进行60 d养殖实验。根据暴露期间中华圆田螺体内PBDEs含量与同系物组成的变化,探讨了田螺对DE-83的富集动力学、积累常数以及可能发生的生物转化。实验结果显示,DE-83主要同系物均能够被中华圆田螺积累,但是生物有效性非常低,BDE-209、BDE-207和BDE-206的吸收速率常数(ks)为0.029~0.042 d-1,BDE-207 > BDE-206 > BDE-209。依据动力学参数推算的生物-沉积物积累因子(BSAF)非常低,分别为0.05(BDE-209)和0.02(BDE-206和BDE-207)。暴露20 d后,中华圆田螺体内有低溴代同系物检出,其含量随暴露时间延长而增加,说明BDE-209在中华圆田螺体内发生了生物转化。
Bioaccumulation and Biotransformation of Sediment-Associated DE-83 in Cipangopaludina cahayensis, Gastropoda
- 1. Tianjin Key Laboratory of Marine Resources and Chemistry, College of Marine Science and Engineering, Tianjin University of Science and Technology, Tianjin 300457, China;
- 2. Key Laboratory of Pollution Processes and Environmental Criteria, Ministry of Education, Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China
- Received Date:
2012-10-11
Fund Project:
Abstract: Cipangopaludina cahayensis was exposed to a commercial product of BDEs (DE-83) in sediments for 60 days to investigate the bioaccumulation and biotransformation of nona-and deca-BDEs. The major congeners in DE-83 were 92% of BDE-209, 6% of BDE-206, 1.5% of BDE-207 and 0.5% of BDE-208. The results showed that all the major congeners were bioaccumulated in C. cahayensis. The uptake coefficients (ks) of nona-and deca-BDE congeners in C. cahayensis ranged from 0.029 to 0.042 d-1, and the value of BDE-207 was slightly higher than those of BDE-206 and BDE-209. Nona-and deca-BDE congeners displayed low bioavailability with biota sediment accumulation factor (BSAF) of 0.02 for BDE-206 and BDE-207 and 0.05 for BDE-209, respectively. Lower brominated BDEs were detected in the tissue of C. cahayensis and their concentrations increased with the exposure duration, which could result from the biotransformation of high brominated BDEs.
点击查看大图
下载:
