Abstract
Abstract The coagulated ion-exchanger colorimetry was applied to the determination of a trace amount of cobalt(II). Cobalt(II)–thiocyanate complex was fixed by a batch method on the coagulated material composed of fine particles of anion and cation exchangers. The coagulated material was collected on a filter paper and a colored thin layer was prepared. The coloration of the compound was further intensified by dipping the thin layer in a concentrated thiocyanate solution, and the absorbance was determined by a densitometer. The calibration curve showed a good linearity in the range of 1–15 μg of cobalt(II). Iron(III) and copper(II) showed interfering coloration, but these ions were effectively masked by the addition of fluoride and egta, respectively. Zinc(II) gave seriously negative error.
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