Zhang Wei, Chen Lei, Zhang Rong, Lin Kuangfei
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, Shanghai 200237, China; School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China.
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, Shanghai 200237, China; School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China.
Chemosphere. 2015 Mar;122:99-104. doi: 10.1016/j.chemosphere.2014.11.021. Epub 2014 Dec 4.
Lead (Pb) and decabromodiphenyl ether (BDE209) are the main pollutants at e-waste recycling sites (EWRSs). Focus on joint toxicological effects of the two chemicals has increasingly gained a great amount of interest. Therefore, the lab study was performed to determine the Pb mobility and microbial toxicity in a Pb-polluted soil in the presence of BDE209 for the first time. The results showed that BDE209 was barely degraded and could elicit the combined effects with Pb exposure during the entire incubation period. The exchangeable (EXCH) and carbonates fractions of Pb were transformed to organic, Fe/Mn oxides and residual fractions, and the addition of an appropriate amount (100mgkg(-1)) of BDE209 facilitated the transformation compared with Pb alone. In addition, soil microbial biomass C (Cmic), soil basal respiration (SBR) and metabolic quotient (qCO2) increased in the beginning of the experiment and then declined with the incubation period extension, and BDE209 addition might cause notable different response relative to the control. Significant correlations between EXCH or mobility factor (MF) of Pb and SBR, Cmic, or qCO2 in soil treated with BDE209 can be clearly observed. Results of the observations provide a better understanding of ecotoxicological effects of Pb and BDE209 joint exposure on indigenous microorganisms in soil at EWRSs.
铅（Pb）和十溴二苯醚（BDE209）是电子垃圾回收场地（EWRSs）的主要污染物。对这两种化学物质联合毒理学效应的关注日益增加。因此，首次开展了实验室研究，以确定在存在BDE209的情况下，铅污染土壤中铅的迁移性和微生物毒性。结果表明，在整个培养期内，BDE209几乎未降解，且能与铅暴露产生联合效应。铅的可交换态（EXCH）和碳酸盐结合态部分转化为有机结合态、铁/锰氧化物结合态和残渣态，与单独的铅相比，添加适量（100mgkg(-1)）的BDE209促进了这种转化。此外，在实验开始时土壤微生物生物量碳（Cmic）、土壤基础呼吸（SBR）和代谢商（qCO2）增加，随后随着培养期延长而下降，添加BDE209可能导致相对于对照有显著不同的响应。在添加BDE209处理的土壤中，可清晰观察到铅的EXCH或迁移因子（MF）与SBR、Cmic或qCO2之间存在显著相关性。这些观察结果有助于更好地理解铅和BDE209联合暴露对EWRSs土壤中本土微生物的生态毒理学效应。
