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首页> 外文期刊>Environmental Science & Technology >Effect of alcohols on the retention mechanisms of Cd and Zn on Wyoming bentonite and illite
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Effect of alcohols on the retention mechanisms of Cd and Zn on Wyoming bentonite and illite

机译：醇对怀俄明州膨润土和伊利石中镉和锌的保留机理的影响

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摘要

The effects of ethanol- and methanol-water mixtures on Zn and Cd sorption onto bentonite and illite were investigated at low initial metal concentration (<= 10(-5) M) and low ionic strength (2.5 mM Ca(NO3)(2)). For all cosolvent fractions, the percent coverage of Zn and Cd to clay minerals was low (< 5%) and independent of the solution dielectric constant, 6, except for Zn at 10 mu M. Cadmium sorption to bentonite and illite was independent of E. Zinc sorption varied significantly between clay types, cosolvent type,and cosolvent fraction. The partitioning of Zn to bentonite increased from 0 to 10% alcohol-water fraction and decreased after 10%. The same pattern was observed for the partitioning of Zn on illite in methanol-water mixtures. In ethanol-water mixtures, K-f for Zn on illite increased continuously from 0 to 50% ethanol. The decreased partitioning and hence mobility of Zn to bentonite and illite after 10% alcohol (only in methanol-water mixtures for illite) suggests a potential environmental threat resulting from increased transport of this metal in subsurface environments where these cosolvents are present.
机译：在低初始金属浓度（<= 10（-5）M）和低离子强度（2.5 mM Ca（NO3）（2））下研究了乙醇和甲醇-水混合物对锌和镉吸附在膨润土和伊利石上的影响。 ）。对于所有助溶剂组分，Zn和Cd对粘土矿物的覆盖率很低（<5％），并且与溶液介电常数无关，为6，除了Zn在10μM时。膨润土和伊利石对镉的吸附与E无关。锌的吸附在粘土类型，助溶剂类型和助溶剂级分之间有很大差异。锌与膨润土之间的分配从0％到10％的酒精-水份额增加，而在10％之后减少。观察到在甲醇-水混合物中伊利石上锌的分配规律相同。在乙醇-水混合物中，伊利石上锌的K-f从0％到50％乙醇不断增加。在10％的酒精（仅在用于伊利石的甲醇-水混合物中）后，锌的分配减少，因此锌向膨润土和伊利石的迁移性降低，表明这种金属在存在这些助溶剂的地下环境中的运输增加，从而潜在的环境威胁。

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