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首页> 美国政府科技报告 >Effects of pH, Solid/Solution Ratio, Ionic Strength, and Organic Acids on Pb andCd Sorption on Kaolinite
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Effects of pH, Solid/Solution Ratio, Ionic Strength, and Organic Acids on Pb andCd Sorption on Kaolinite

机译：pH，固/溶液比，离子强度和有机酸对高岭土中pb和Cd吸附的影响

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Potentiometric and ion-selective electrode titrations together with batchsorption/desorption experiments, were performed to explain the aqueous and surface complexation reactions between kaolinite, Pb, Cd and organic acids. Variables included pH, ionic strength, metal concentration, kaolinite concentration and time. The organic acids used were p-hydroxybenzoic acid, o-toluic acid, and 2,4-dinitrophenol. Titrations were used to derive previously unavailable aqueous conditional stability constants for the organometallic complexes. Batch results showed that aqueous lead-organic complexation reduced sorption of Pb by kaolinite. Cadmium behavior was similar, except for 2,4-dinitrophenol, where Cd sorption was increased. Metal sorption increased with increasing pH and decreasing ionic strength. Distribution ratios (K(sub d)'s) decreased with increasing solid/solution ratio. The subsurface transport of lead and cadmium may be enhanced via complex interactions with organic wastes or their degradation products and sorbent mineral surfaces. (Copyright (c) 1991 Kluwer Academic Publishers.)

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