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Abstract
A semi-automatic spectrophotometric method is described for the catalytic titration of ethylenediaminetetraacetic acid, based on its inhibitory effect on the manganese (II)catalyzed aerial oxidation of 1,4-dihydroxyphthalimide dithiosemicarbazone. Amounts of EDTA in the 750–4000-μg range can be determined with a relative standard deviation of ca 0. 6% ( n = 11). Methods are also described for the indirect catalytic titrations of manganese(II) and nickel(II)in the ranges 20–450 μg and 40–1000 μg, respectively, with relative standard deviations ( n = 11) of ca. 1%.
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