| 白洋淀水生食物链BHC、DDT生物浓缩分析 |
| 摘要点击 2316 全文点击 2897 投稿时间：1997-01-24 |
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| 中文关键词 白洋淀水域生态系统 六六六 DDT 食物链 营养级 富集系数 污染 |
| 英文关键词 Baiyangdian Lake ecosystem BHC DDT foodweb the bioconcentration factor |
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| 中文摘要 |
| 为了评价BHC和DDT在水生食物链的生物累积放大效应,对白洋淀地区端村水域生态系统水、泥及水生生物体内六六六、DDT含量进行分析。结果表明,白洋淀水域生态系统水生生物对六六六、DDT的富集沿食物链生物营养等级而递增的规律性较强(当年生鲫鱼例外).水体、底泥、水生维管束植物、浮游动物、底栖动物、当年生鲫鱼及2龄乌鳢体内六六六残留量分别为:0.3μg/L、0.7μg/kg、19.0μg/kg、30.0μg/kg、60.9μg/kg、17.2μg/kg、110.7μg/kg、;DDT残留量分别为:0.1μg/L、0.7μg/kg、6.3μg/kg、21.0μg/kg、37.9μg/kg、19.4μg/kg、124.4μg/kg.水生生物对DDT的富集系数(63-1244)明显超过六六六(63.3-369).水生生物体内六六六4种异构体的含量顺序(α>δ>γ>β)与其在水体及底泥中的含量顺序(α>γ>δ>β)略有不同。在白洋淀水生生态系统中DDT主要以代谢物P,P'-DDE形式存在,但少量的DDT最初化合物P,P'-DDT的检出,说明白洋淀水环境最近受到DDT的轻度污染。 |
| 英文摘要 |
| BHC、DDT and their metabolites were analysed in Duancun area from Baiyangdian Lake ecosystem in June 1995.The content levels of pesticides in water and bottom sediments were relatively lower:in water,the average values of BHC and DDT were 0.3μg/L and 0.1μg/L,respectively;in sediments,the residue level of BHC was same with DDT with a mean concentration of 0.7μg/kg(wet).The organochlorine insecticides content in aquatic organisms was much higher:the average concentration of BHC in hydrophytes,planktons,benthic macroinvertebrates,young of the year Carassius auratus and 2 year old Ophiocephalus crispus was 19.0,30.0,60.9,17.2 and 110.7μg/kg,respectively;for DDT, the content sequence was 6.3,21.0,37.9,19.4 and 124.4g/kg,respectively.So the lipophilic nature and low biodegradation rates of BHC and DDT led to the accumulation of these compounds and subsequent magnification of concentration in organisms progressing up the food chain.DDT had a much profound bioaccumulation potential than BHC for the bioconcentration factor of DDT in organisms(63.3-1244)was well above that of BHC(63-369).The ratios of BHC isomers monitored in organisms(δ>α>γ>β)were different from that in water and sediments(α>δ>γ>β).The predominant DDT derivative was p,p′-DDE.Base upon the observed that the original DDT(P,P′-DDT)was indentified in some specimens,it has been concluded that there was a recent input of DDT to Baiyangdian Lake. |
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