Interaction of cesium with humic materials: A comparative study of radioactivity and ISE measurements

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.