The interaction of Cs + with the different fractions of humic materials (humic acid, fulvic acid, and humin) is studied radiometrically and with an ion-selective electrode (ISE). The results indicate that Cs + can partially complex humic acid, but not fulvic acid. The uptake of Cs + by humin is small, and the amount of Cs + required for saturation is 3.72 (mg metal)/(g humin). The ISE is a suitable tool for measuring the free metal ions remaining after the formation of the metal humate complex.
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Helal et al. (2007) studied this question.
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