| 三峡库区主要支流表层沉积物多溴联苯醚的分布特征 |
| 摘要点击 3226 全文点击 1717 投稿时间：2012-09-26 修订日期：2012-10-26 |
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| 中文关键词 三峡库区 沉积物 多溴联苯醚 分布特征 |
| 英文关键词 Three Gorges Reservoir sediment polybrominated diphenyl ethers(PBDEs) distribution characteristics |
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| 中文摘要 |
| 采用GC-MS(NCI)技术对三峡库区28个表层沉积物样品中的多溴联苯醚(PBDEs)进行分析,研究了其在三峡库区主要支流的污染现状与分布特征. 实验发现三峡库区∑26PBDEs和BDE209在沉积物中的检出含量分别为35.24 pg·g-1和11.92 pg·g-1,其中BDE28, 47, 77和99为∑26PBDEs中最具支配地位的同族体. ∑26PBDEs和BDE209的最高检出含量在龙河河口采样点,分别为146.07 pg·g-1和502.63 pg·g-1. ∑26PBDEs和BDE209含量具有良好相关性,说明两者污染来源相同. 实验结果与国内外水体沉积物中含量相比较,显示∑26PBDEs和BDE209在三峡库区沉积物中含量处于较低污染水平,引起的潜在风险也相对较低. |
| 英文摘要 |
| A total of 28 surface sediment samples (at the top 0-5 cm layer) were collected from the Three Gorges Reservoir of Yangtze River. The content of polybrominated diphenyl ethers(PBDEs) in sediments was measured with Varian GC-MS(NCI). The results showed that ∑26PBDEs and BDE209 both had a low concentration in sediments, with a mass concentration of 35.24 pg·g-1 and 11.92 pg·g-1, respectively. Among the 26 PBDEs, BDE28, 47, 77 and 99 were the most predominant ∑26PBDEs congeners. The highest concentrations of ∑26PBDEs and BDE209 were detected in the sediment samples collected from Long River, with geometric mean of 146.07 and 502.63 pg·g-1, respectively. A significant correlation was found between ∑26PBDEs and BDE209, indicating that they might have the same pollution source. The concentrations of ∑26PBDEs and BDE209 in the sediment were in the same order of magnitude with those reported on background levels in sediments of remote lakes in other countries, which shows the toxic biological effects on aquatic biota and potential risk due to ∑26PBDEs and BDE209 contamination in sediments are negligible. |
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