成渝经济区河流表层沉积物中多溴联苯醚的分布特征

摘要

在成渝经济区内采集了19个表层沉积物样品,采用GC/MS方法对其中的PBDEs(Polybrominated Diphenyl Ethers,多溴联苯醚)进行了检测.结果表明,沉积物中w(∑PBDEs)(∑PBDEs包括BDE-1,BDE-15,BDE-17,BDE-28,BDE-47,BDE-66,BDE-71,BDE-85,BDE-99,BDE-100,BDE-126,BDE-138,BDE-153,BDE-154,BDE-166,BDE-181,BDE-183和BDE-190)为0.20～6.45 ng/g,w(BDE-209)为0.44～6.29 ng/g.与其他地区相比,成渝经济区内PBDEs的污染水平相对较低,大部分样品中的PBDEs以BDE-209为主,说明成渝经济区河流沉积物中的PBDEs主要来自十溴联苯醚；但PBDEs的组成特征显示,彭山岷江大桥沉积物中的PBDEs主要来自五溴联苯醚,而官渡沉积物中的PBDEs主要来自八溴联苯醚.此外,一些以往工作较少关注的PBDEs单体,如BDE-1,BDE-15,BDE-181和BDE-190等,不但在沉积物中的检出率较高(均高于70％),而且有的含量也相对较高.%Nineteen surface river sediments were collected from the Cheng-Yu Economic Zone ( CYEZ) , and the Polybrominated Diphenyl Ethers (PBDEs) in the sediments were analyzed using GC/MS method. The results showed that the concentrations of ΣPBDEs ( sum of BDE-1, BDE-15, BDE-17, BDE-28, BDE-47, BDE-66, BDE-71, BDE-85, BDE-99, BDE-100, BDE-126, BDE-138, BDE-153, BDE-154, BDE-166, BDE-181, BDE-183 and BDE-190) and BDE-209 in the sediments ranged from 0. 20 to 6. 45 ng/g and from 0. 44 to 6. 29 ng/g, respectively. The PBDE contamination in the CYEZ was relatively low as compared with other studied areas. The PBDEs in most samples from the CYEZ were dominated by BDE-209, suggesting that a primary source was Deca-BDE technical mixture. Meanwhile, the congener patterns of PBDEs in the sediments from Pengshan Minjiang Bridge and Guandu indicated that the major sources of PBDEs were Penta-BDEs technical mixture for Pengshan Minjiang Bridge and Octa-BDEs technical mixture for Guandu. In addition, some BDE congeners, such as BDE-1, BDE-15, BDE-181, and BDE-190, which were rarely reported in previous works, were frequently detected in these sediments (detectable rate higher than 70% ) with relatively high abundance.