江苏经济高速发展城市香樟树皮中的多溴联苯醚

Polybrominated Diphenyl Ethers in Camphor Bark from Speedy Developing Urban in Jiangsu Province

2009年7月在江苏省南部城市苏州,南通和无锡采集了40组香樟树皮样品,用加速溶剂萃取、气相色谱质谱法测定了样品中8种多溴联苯醚(PBDEs).结果表明,所有样品中都检出了PBDEs,Σ8 PBDEs(BDE28、47、100、99、153、154、183、209)平均含量为835μg/kg脂重(112～7 460μg/kg).BDE209是最主要的同族体单体,占Σ8 PBDEs含量的65.7%～99.6%.香樟树皮中PBDEs来源主要为工业品十溴联苯醚.南通市工业园区树皮样品的Σ8 PBDEs含量远远大于中心区,说明南通市工业区PBDEs污染可能主要来自工业释放源.苏州市和无锡市工业园区和中心区样品中Σ8 PBDEs含量没有明显差异,可能原因是PBDEs通过大气传输在城市工业区和中心区相互交叉影响造成的.树皮中的五溴联苯醚同族体单体与工业品、大气及降尘中的丰度比例不完全一致,这与树皮的吸附作用和PBDEs的脱溴降解有关.

Polybrominated Diphenyl Ethers（PBDEs）were measured in camphor bark samples from 40 locations in Suzhou,Nantong and Wuxi,Jiangsu Province.The samples were extracted by accelerated solvent extraction（ASE） and analyzed using gas chromatography/mass spectrometry（GC-MS）.The 8 PBDEs were detected in all samples and the average concentrations of total PBDEs（BDE28,47,100,99,153,154,183,209）was 835 μg/kg lipid weight（ranged from 112 to 7 460 μg/kg lipid weight）.The BDE209 was the main homologues and accounted for 65.7%-99.6% of ∑8PBDEs.The predominant commercial products source for PBDEs in bark was Deca-BDE commercial products.Concentration of ∑8PBDEs detected in central district of Nantong were significantly higher than those in industrial park,suggesting the discharge of industrial point source might be the main source of PBDEs in this city.No significant difference was found between the levels of ∑8PBDEs in camphor bark collected from Suzhou and Wuxi.It can be concluded that the two cities are contaminated interactionally by PBDEs through atmospheric dispersion.The homologue and congener profiles of penta-BDEs for camphor bark were not consistent with commercial products,atmosphere and dust soil,which related with adsorption effect of tree bark and degradation effect of PBDEs.