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Specific ion effect of H^(+) on variably charged soil colloid aggregation

Pedosphere 2020年第6期30卷 844-852页

作者： Yekun ZHANG Rui TIAN Jia TANG Hang LI Chongqing Key Laboratory of Soil Multi-Scale Interfacial Process College of Resources and EnvironmentSouthwest UniversityChongqing 400715China

Specific ion effects(Hofmeister effects)have recently attracted the attention of soil scientists,and it has been found that ionic non-classic polarization plays an important role in the specific ion effect in ***,this explanation cannot be applied to H+.The aim of this work was to characterize the specific ion effect of H+on variably charged soil(yellow soil)colloid *** total average aggregation(TAA)rate,critical coagulation concentration(CCC),activation energy,and zeta potential were used to characterize and compare the specific ion effects of H+,K+,and Na+.Results showed that strong specific ion effects of H+,K+,and Na+existed in variably charged soil colloid *** TAA rate,CCC,and activation energy were sensitive to H+,and the addition of a small amount of H+changed the TAA rate,CCC,and activation energy *** zeta potential results indicated that the specific ion effects of H+,K+,and Na+on soil colloid aggregation were caused by the specific ion effects of H+,K+,and Na+on the soil electric field *** addition,the origin of the specific ion effect for H+was its chemical adsorption onto surfaces,while those for alkali cations were non-classic *** study indicated that H+,which occurs naturally in variably charged soils,will dominate variably charged soil colloid aggregation.

关键词： activation energy chemical adsorption critical coagulation concentration dynamic light scattering Hofmeister effect total average aggregation rate zeta potential

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