Effect of Counter Anion on Extractive Spectrophotometric Determination of Copper(II) with Thiacrown Compounds

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In order to increase the selectivity and the sensitivity of the extractive and Spectrophotometric determination of class b and ab metals with thiacrown ethers, the effects of several kinds of counter anions on the extraction of copper(II) were examined with 1, 4, 7, 10, 13, 16-hexathiacyclooctadecane (HTCO) and 1, 4, 8, 11-tetrathiacyclotetradecane (TTCT). Tetrabromophenolphthalein ethylester (TBPE) anion was the best one among the seven kinds of dye anions examined. More than 99% copper(II) was selectively extracted with HTCO into 1, 2-dichloroethane in the range of pH 7 to 9, whereas cobalt(II), zinc(II) and cadmium(II) were not extracted at all. The molar absorptivity of the copper(II) extract was 8.8×10⁴ (at λ_max=608nm), which was the highest value found.