| 卤系阻燃剂在东江鱼体中的生物富集 |
| 摘要点击 3025 全文点击 1158 投稿时间：2016-07-23 修订日期：2016-08-26 |
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| 中文关键词 卤系阻燃剂 生物富集 生物富集因子 生物沉积物富集因子 东江 |
| 英文关键词 halogenated flame retardant bioaccumulation bioaccumulation factor biota-sediment accumulation factor Dongjinag River |
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| 中文摘要 |
| 准确获取化合物的生物富集因子（BAF）对于判定化合物是否属于潜在毒害性污染物、评价其生态环境风险都具有重要的意义.本文以东江水体为研究区域，以PBDEs、DBDPE、DP、TBBPA和HBCDs为目标化合物，研究了其在3种鱼体中的富集特征.结果表明，5种化合物的lgBAF的变化范围分别为5.0~7.4、6.1~7.1、4.6~7.9、2.6~4.6和4.8~7.7.在本研究中，大多的化合物lgBAF值均大于3.7，说明这些污染物都具有生物富集能力.HFRs的BAF值总体随着lgKow值的增加而增加，但当lgKow>7时，生物对PBDEs的生物富集能力有所下降.γ-HBCD向α-HBCD的生物转化以及生物体对BDE66和BDE99的代谢导致这几种单体偏离了这个模型预测趋势.DBDPE的BAF值大于BDE209的BAF值，作为大分子污染物，DBDPE的生物富集能力应该值得关注.通过对污染物的生物沉积物富集因子（BSAF）的计算，发现绝大多数的污染物的BSAF值均小于1，表明沉积物不太可能作为水生生物的污染源. |
| 英文摘要 |
| Bioaccumulation factor (BAF) plays a key role in identification of bioaccumulative substance and in assessment of chemical risks.In order to reveal the bioaccumulation behavior of fish in Dongjiang River,sediment,water and fish samples were collected from Dongjiang River and PBDEs,DBDPE,DP,TBBPA and HBCDs were measured.The ranges of lgBAF were 5.0-7.4,6.1-7.1,4.6-7.9,2.6-4.6 and 4.8-7.7,respectively.In the present study,most HFRs had a lgBAF of higher than 3.7,which suggested that they might be bioaccumulative.The BAF values of HFRs increased with increasing lgKow,when lgKow>7,the bioaccumulation extent decreased with the increase of lgKow.Biotransformation of γ-HBCD toward α-HBCD and the metabolism of BDE66 and BDE99 of these isomers might attribute to the deviation from the general trend predicted by Kow.More attention should be paid to DBDPE,since its BAF value was higher than that of BDE209.The BSAF values of most PBDEs,DBDPE,DP,TBBPA and HBCDs congeners in three fish species were less than 1,indicating that these compounds were unlikely to become a source of pollution to the aquatic organisms due to the poor bioavailability. |
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