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土壤粒径及有机质对多溴二苯醚热脱附的影响

Keywords: 多溴二苯醚,热脱附,粒径,有机质

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Abstract:

在实验室条件下,研究了土壤粒径与土壤有机质含量对多溴二苯醚(PBDEs)热脱附的影响,以期为PBDEs污染土壤热脱附修复提供理论依据。实验结果表明,300℃停留30min条件下,粒径为<75、75~125、125~250、250~425和425~850μm的土壤中PBDEs去除率分别为49.53%、73.88%、79.39%、83.56%和87.09%,PBDEs总去除率随粒径的增大而增大,土壤BDE209较BDE206、BDE207和BDE208更易于脱除。此外,温度低于450℃时,H2O2氧化部分去除有机质后土壤中PBDEs的去除率较原土高;表明,土壤有机质可能抑制土壤中PBDEs的热脱附。

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