农业环境科学学报2013，Vol.32Issue(1)：63-68,6.DOI:10.11654/jaes.2013.01.010
六溴环十二烷在不同用途土壤中的污染特征
Distribution of Hexabromocyclododecanes in Soils for Different Uses: Concentration, Diastereomeric and Enantiomeric Profiles
摘要
Abstract
Hexabromocyclododecanes(HBCDs), one of additive brominated flame retardants, are extensively applied in building, textiles and electronics. The distribution and fate of HBCDs in the environment has drawn much attention. In the present study, soils in farmland in a sewage irrigation area and from an electronic product recycling district in Tianjin were sampled. The samples were extracted with 1:1 hexane-acetone in a Soxhlet device for 24 h and cleaned up with concentrated sulfuric acid and silica column. The extracts were analyzed with LC-MS/MS, and HBCD concentration, diastereomer and enantiomer profiles were further analyzed. The concentration of HBCDs in soils from electronic product recycling district ranged between from 1.57 ng-g-1 to 3.76 ng-g-1 dw; and 9.33 ng-g-1 to 44.6 ng-g-1' dw in farmland from a-gricultural district. The concentration of HBCDs in sewage sludge from the two districts exhibited the same trend. The unexpected higher HBCD concentration in farmland as compared with those from electronic product recycling district could be due to the sewage irrigation from Dagu Drainage Canal. On other aspect, this suggested that HBCDs were not widely used in electric products in China. Diastereomer-specific selectivity occurred in soil from electronic product recycling district with higher a-HBCD ratio as compared to those in technical products with higher y-HBCD ratio, indicating the transformation between HBCD diastereomers; while this phenomenon was not observed in soils from agricultural district. There was no uniform tendency of enantiomeric selectivity in soils, indicating that the enantiomeric selectivity is determined by multiple processes controlled by variable factors. As for (3-HBCD, agricultural soils exhibited enantiomeric selectivity of (+ )-HBCD and vice versa in soils from electronic product recycling district.关键词
六溴环十二烷/异构体/对映体/农田土壤/电子废物土壤Key words
HBCDs/ diastereomers/ enantiomers/ agricultural soils/ electronic waste soils分类
资源环境引用本文复制引用
张艳伟,阮悦斐,赵立杰,干志伟,孙红文..六溴环十二烷在不同用途土壤中的污染特征[J].农业环境科学学报,2013,32(1):63-68,6.基金项目
国家自然科学基金(41073087) （41073087）
