期刊
CHEMOSPHERE
卷 151, 期 -, 页码 339-344出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2016.02.026
关键词
Marine oligochaete; Polychaete; Nitrated polycyclic aromatic hydrocarbon; Bioremediation
资金
- Japan Society for the Promotion of Science (JSPS) KAKENHI [26712017]
- Grants-in-Aid for Scientific Research [26712017] Funding Source: KAKEN
Bioremediation is a promising method for remediating environmentally polluted water. We investigated the abilities of two benthic annelid species to biotransform 1-nitronaphthalene, a nitrated polycyclic aromatic hydrocarbon. We used an oligochaete, Thalassodrilides sp. (Naididae), collected from the sediment beneath a fish farm and a polychaete, Perinereis nuntia, which was obtained from a commercial source. Populations of both organisms were exposed to 1400 mu g L-1 of 1-nitronaphthalene in seawater for 3 days in the dark at 20 degrees C. The concentration of the pollutant decreased to 12 mu g L-1 in the seawater containing the Thalassodrilides sp. and to 560 mu g L-1 in the seawater containing P. nuntia. The 1-nitronaphthalene concentration in the bodies of the animals increased from 12 to 94 mu g kg(-1) in Thalassodrilides sp. and from 0.90 mu g kg(-1) to 38,000 mu g kg(-1) in P. nuntia. After 3 days, 99% and 40% of the 1-nitronaphthalene had been biotransformed in the Thalassodrilides sp. and P. nuntia experimental groups, respectively. We then tested the acute toxicity of residual 1-nitronaphthalene from the same water using mummichog (fish) larvae. After the larvae had been exposed for 96 h, the percentage of apparently unaffected larvae remaining was 83.3% in Thalassodrilides sp. group but only 16.7% in the P. nuntia group. Clearly, of the two species we studied, Thalassodrilides sp. had a superior ability to convert 1-nitronaphthalene into substances that were nontoxic to mummichog larvae. Therefore, we recommend the use of this species for bioremediation of chemically polluted sediments. (C) 2016 Elsevier Ltd. All rights reserved.
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