求参考文献两篇：
1.Source and risk assessment of PCBs in sediments of Fenhe reservoir and watershed, China. J. Environ. Monit., 2012,
DOI: 10.1039/C2EM10856A
2.Gene-TEQ—a standardized comparative assessment of effects in the comet assay using genotoxicity equivalents. J. Environ. Monit., 2012, DOI: 10.1039/C2EM10947F
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