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OALib Journal期刊
ISSN: 2333-9721
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土壤b[a]p多次叠加污染的生物有效性及对蚯蚓体腔细胞染色体和溶酶体的毒性效应
DOI: 10.3724/SP.J.1145.2014.04002, PP. 1020-1026
Keywords: b[a]p,叠加污染,tenax提取,溶酶体膜,微核变率
Abstract:
benzo(a)pyrene（b[a]p）作为典型具有“三致”效应的持久性有机污染物，在土壤中逐步累积，对土壤生态安全造成潜在威胁.通过一次与多次污染的方法，研究b[a]p在土壤中的有效性特征及其对蚯蚓（eiseniafetida）体腔细胞染色体畸变及溶酶体膜完整性的毒性效应.结果显示：随着培养时间的延长，土壤中b[a]p含量及蚯蚓体内b[a]p富集量、蚯蚓体腔细胞微核变率均呈现初期（28d）下降速率较快，尔后（28-56d）下降速率减小的趋势；而蚯蚓体腔细胞中性红保留时间（nrrt）升高速率呈先快后慢的趋势.土壤中b[a]p的tenax法提取含量与蚯蚓体内b[a]p富集量呈极显著正相关（r2=8614，p<0.01）；蚯蚓体腔细胞nrrt和微核变率分别与土壤中b[a]p的tenax法提取含量和蚯蚓体内b[a]p富集量呈显著正相关（p<0.05）.相同培养时间内，多次叠加污染土壤中b[a]p的tenax提取含量和蚯蚓富集量显著低于一次污染26.00%（p<0.05）；蚯蚓体腔细胞nrrt平均比一次污染高13.00%（p<0.05）；体腔细胞微核率比一次污染低36.10%（p<0.05）.本研究表明土壤b[a]p多次叠加污染对蚯蚓的毒性效应低于一次污染，结果可为土壤pahs类污染物的生态毒性效应评价提供理论基础.
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