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首页> 外文期刊>Journal of Hazardous Materials >Effects of humidity and soil organic matter on the sorption of chlorinated methanes in synthetic humic-clay complexes
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Effects of humidity and soil organic matter on the sorption of chlorinated methanes in synthetic humic-clay complexes

机译：湿度和土壤有机质对腐殖土-粘土复合物中氯甲烷吸附的影响

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Vapor-phase sorption is the most influential process governing the transport and the fate of volatile organic compounds in soil. To understand the influence of both soil organic content and the humidity of soil on the vapor sorption is an important process for degradation processes. The single--pellet moment technique was used to investigate sorption and diffusion of trichloromethane (TCM) and carbon tetrachloride (CTC) at varying relative humidities (0-80/100) of synthetic humic-clay complex pellets consisting of clay (montmorillonite) and different amounts of organic matter (humic acid). The effective diffusivities of TCM and CTC did not show a noticeable change with moisture and humic acid content. On the other hand, with increasing humic acid content of clay at 0/100 relative humidity, an appreciable decrease of the equilibrium sorption constants of the tracers (TCM, CTC) was found because of the blockage of some sites of the mineral surfaces and especially micropores by the humic acid. The presence of water also reduced dramatically the sorption of TCM and CTC on synthetic humic-clay complexes. Above 20/100 relative humidity, the sorption coeffcient of TCM and CTC varied only slightly with humic acid content. It was concluded that the sorption of TCM and CTC in synthetic humic-clay complexes was strongly effected by the moisture and humic acid content.
机译：气相吸附是控制土壤中挥发性有机化合物的迁移和命运的最有影响的过程。理解土壤有机物含量和土壤湿度对蒸气吸附的影响是降解过程的重要过程。单粒矩技术用于研究由粘土（蒙脱石）和粘土组成的合成腐殖土复合颗粒在不同相对湿度（0-80 / 100）下三氯甲烷（TCM）和四氯化碳（CTC）的吸附和扩散。不同数量的有机物（腐殖酸）。中药和四氯化碳的有效扩散率并未显示出随水分和腐殖酸含量的明显变化。另一方面，随着相对湿度为0/100时粘土中腐殖酸含量的增加，示踪剂（TCM，CTC）的平衡吸附常数显着下降，原因是矿物表面的某些部位被阻塞，尤其是腐殖酸产生的微孔。水的存在也大大降低了中药和四氯化碳在合成腐殖土-粘土复合物上的吸附。相对湿度高于20/100时，TCM和CTC的吸附系数随腐殖酸含量的变化很小。结论是，水分和腐殖酸含量强烈影响中药和腐植酸在合成腐殖土-粘土配合物中的吸附。

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