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The effect of background anion on cation exchange reactions, such as Na-Ca and Na-Cu exchange reactions, on montmorillonites has been studied, but the results are not always clear and discrepancies exist in the literature. In this study, the exchange of zinc (Zn2+) for sodium (Na+) on Wyoming montmorillonite was investigated at 298°K using Cl-, ClO4-, NO3-, OAc-, and SO42- solution media at a constant total metal charge concentration of 0.0200 molc L-1. Results indicated that the clay CEC values were essential similar for Cl-, C1O4-, NO3- and SO42- solution media with an average CEC of 0.856±0.008 molc kg-1; in an OAc+ solution the clay CEC was much higher than that in other anion media. The specific adsorption of Zn (SAZn), as defined by the extraction of Zn using 0.05mol L-1 Na2-EDTA, was different in the various background solutions. The highest value for SAZn was 0.359±0.0350molc kg-1, which occurred in OAc-solution. There was essentially no difference in the total apparent adsorbed metals (the su
The effect of background anion on cation exchange reactions, such as Na-Ca and Na-Cu exchange reactions, on montmorillonites has been studied, but the results are not always clear and discrepancies exist in the literature. In this study, the exchange of zinc (Zn2 +) for sodium (Na +) on Wyoming montmorillonite was investigated at 298 ° K using Cl-, ClO4-, NO3-, OAc-, and SO42- solution media at a constant total metal charge concentration of 0.0200 molc L-1. indicated that the clay CEC values were essential similar for Cl-, C1O4-, NO3- and SO42- solution media with an average CEC of 0.856 ± 0.008 molc kg-1; in an OAc + solution the clay CEC was much higher than that in other The specific adsorption of Zn (SAZn), as defined by the extraction of Zn using 0.05 mol L-1 Na2-EDTA, was different in the various background solutions. The highest value for SAZn was 0.359 ± 0.0350 mol kg -1 , which occurred in OAc-solution. There was no difference in the total apparent adso rbed metals (the su