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基于氧化逆境标志物的北部湾潮间带沉积物有机污染程度综合评价

DOI: 10.3969/j.issn.0253-4193.2013.03.018, PP. 155-165

Keywords: 北部湾,有机污染,波纹巴非蛤(Paphiaundulata),生物标志物,综合标志物响应(IBR)指数

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Abstract:

利用综合生物标志物响应(IBR)指数对北部湾潮间带沉积环境中多氯联苯(PCBs)、石油烃(TPH)、壬基酚(NP)和苯并芘(B[a]P)的综合污染水平进行评价。在9个站位采集波纹巴非蛤(Paphiaundulata)和沉积物样品,测定沉积物和生物软组织中有机污染物含量,同时对鳃、内脏中与细胞防御系统有关的各7种标志物(包括还原型谷胱甘肽(GSH)、氧化型谷胱甘肽(GSSG)、谷胱甘肽过氧化物酶(GPx)、过氧化氢酶(CAT)等)进行分析。利用相关性分析法筛选出对1~2种有机污染物响应敏感的生物标志物共8种,分别为内脏中的GPx、GSH、GSSG、CAT和鳃中的GPx、GSH、GSSG、CAT。以筛选的8种生物标志物为基础,9个站位IBR指数范围为0.27~1.48,其中站位S2(湛江市乐民镇码头)、站位S9(湛江市江洪码头)的IBR较小,显示污染程度最轻;站位S4(防城港西湾)、站位S3(钦州湾老人沙浅滩)IBR较高,显示生物体因有机污染产生氧化逆境。不同站位的IBR值与污染源分布、化学污染物分析结果基本一致,表明该方法可用于北部湾潮间带沉积物有机污染程度的综合评价。

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