Some properties of the calcium form of Chelex-100 relevant to trace metal uptake from natural waters are Investigated. Retention of Cd, Co, Cu, Ni, and Zn by columns of Ca-Chelex Is complete around pH 6.5, but slow resin kinetics at lower pH's can lead to trace metal losses. The resin sites In a given batch are equivalent for trace Cd and Pb uptake: the respective separation factors In equilibrations at decreasing loadings are constant down to trace metal mole fractions <0.001. Three batches of resin had reasonably constant selectivlties for Cd and Pb, but some batch-to-batch variations for Cu and Zn were noted. The use of Ca-Chelex columns to study the speclation of dissolved trace metals In a river water sample Is demonstrated.Chelex-100, a chelating cation-exchange resin with iminodiacetic acid (IDA) as the functional group, has been utilized
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