期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 44, 期 2, 页码 663-667出版社
AMER CHEMICAL SOC
DOI: 10.1021/es901860r
关键词
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资金
- National Basic Research Program of China [2009CB421603]
- National Natural Science Foundation of China [20807048, 40730740, 20621703]
- State Key Laboratory of Organic Geochemistry [OGL-200614]
Deca-bromodiphenyl ether (BDE-209) is the major component of the commercial deca-BDE flame retardant. There is increasing concern over BDE-209 due to its increasing occurrence in the environment and in humans. In this study the behavior of BDE-209 in the soil-plant system was investigated. Accumulation of BDE-209 was observed in the roots and shoots of all the six plant species examined, namely ryegrass, alfalfa, pumpkin, summer squash, maize, and radish. Root uptake of BDE-209 was positively correlated with root lipid content (P < 0.001, R-2 = 0.81). The translocation factor (TF, C-shoot/C-root) of BDE-209 was inversely related to its concentration in roots. Nineteen lower brominated (di- to nor a-) PBDEs were detected in the soil and plant samples and five hydroxylated congeners were detected in the plant samples, indicating debromination and hydroxylation of BDE-209 in the soil-plant system. Evidence of a relatively higher proportion of penta- through di-BDE congeners in plant tissues than in the soil indicates that there is further debromination of PBDEs within plants or low brominated PBDEs are more! readily taken up by plants. A significant negative correlation between the residual BDE-209 concentration in soil and the soil microbial biomass measured as the total phospholipid fatty, acids (PLFAs) (P < 0.05, R-2 = 0.74) suggests that microbial metabolism and degradation contribute to BDE-209 dissipation in soil. These results provide important information about the behavior of BDE-209 in the soil-plant system.
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