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- W2321031680 abstract "The adsorption-desorption of cadmium (Cd) as a function of pH, ionic strength, and composition of the electrolyte was examined for four variable charge soils: two Alfisols from Zimbabwe (Mazowe and Bulawayo) and two Andisols from Spain (Realejos-1 and Realejos-2). At the natural soil pH, Cd adsorption measured in 0.01 mol dm−3 NaNO3 was related to the net negative surface charge of the soils. Most of the Cd adsorbed in the four soils was strongly bonded. Increasing pH increased the surface negative charge of all soils. Adsorption of Cd also increased continuously with rising pH, and part of the variation in adsorption with pH was explained by the variation in the negative surface charge. Desorption decreased as the pH increased and became a trace at pH > 6. Differences in extractability between the two groups of soils were considered to be related to differences in the characteristics of the soil matrix. Increasing the concentration of the electrolyte from 0.001 to 0.1 mol dm−3 NaNO3 caused a decrease in Cd adsorption and enhanced the amount of sorbed metal that could subsequently be desorbed. Variations in the initial pH of the soil suspensions, however, accounted for part of the effect. This pH-ionic strength interaction was even more evident when the most dilute electrolyte was used. Adsorption was reduced in the Caelectrolyte compared with the Na-electrolyte. Calcium, on the contrary, increased Cd desorption." @default.
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- W2321031680 date "1997-10-01" @default.
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- W2321031680 title "INFLUENCE OF ELECTROLYTE ON CADMIUM INTERACTION WITH SELECTED ANDISOLS AND ALFISOLS" @default.
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- W2321031680 doi "https://doi.org/10.1097/00010694-199710000-00006" @default.
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