Sorption of Mecoprop by two clay landfill liner materials: Oxford Clay and Mercia Mudstone
Sorption of Mecoprop by two clay landfill liner materials: Oxford Clay and Mercia Mudstone
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两种粘土垃圾填埋场衬垫材料对 Mecoprop 的吸附：牛津粘土和麦西亚泥石
DOI：
10.1144/1470-9236/08-099
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发表时间：
2011
影响因子：
1.4
通讯作者：
Stringfellow A
中科院分区：
文献类型：
--
作者：
Stringfellow A
摘要作为垃圾填埋场衬垫中污染物自然衰减研究项目的一部分，研究了矿物衬垫材料对Mecoprop（MCPP）的吸附和解吸。麦西亚泥岩和牛津粘土具有通过吸附过程衰减MCPP的潜力，观察到这两种材料的吸附过程都很迅速。吸附到铁的氢氧化物被认为是在麦西亚泥岩的主要机制，并可能是负责一些吸附发生在牛津粘土。对牛津粘土的额外吸附可能与其油母质含量有关，因为这种类型的有机物质已被证明是疏水有机化合物的高度吸附剂，但需要进一步研究来评估油母质是否对极性化合物（如MCPP）具有高亲和力。解吸试验表明，解吸是快速的，吸附是潜在的可逆性。有一些证据表明，单宁酸在合成的渗滤液不影响MCPP的吸附，但高离子强度的渗滤液降低吸附MCPP在牛津粘土。对于监管风险评估，这一结果强调了在类似于所调查环境的基质中进行吸附测试以获得吸附系数的现实结果的重要性。
AbstractAs part of a programme of research into natural attenuation of contaminants in landfill liners, the sorption and desorption of Mecoprop (MCPP) by mineral liner materials was investigated. Mercia Mudstone and Oxford Clay have the potential to attenuate MCPP by sorption processes, which were observed to be rapid in both materials. Sorption to iron hydroxides was thought to be the main mechanism operating in Mercia Mudstone and may be responsible for some of the sorption occurring in Oxford Clay. Additional sorption to Oxford Clay may be related to its kerogen content, as this type of organic matter has been shown to be highly sorbent for hydrophobic organic compounds, but further research is needed to assess whether kerogen has a high affinity for polar compounds such as MCPP. Desorption tests demonstrated that desorption was rapid and that sorption was potentially reversible. There was some evidence that tannic acid in the synthetic leachate did not affect MCPP sorption, but the high ionic strength leachate reduced sorption of MCPP in Oxford Clay. For regulatory risk assessments, this result emphasizes the importance of conducting sorption tests in a matrix similar to that of the environment under investigation to obtain realistic results for sorption coefficients.
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DOI：
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