Fractional spectrophotometric determination of ethylenediaminetetraacetate and nitrilotriacetate as their iron(III) complexes by use of H- and Na-form ion exchange resin columns.

概要

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The fractional determination of ethylenediaminetetraacetate(EDTA) and nitrilotriacetate(NTA) was carried out by use of hydrogen- and sodium-form ion exchange resin columns. After the conversion of free and complexed EDTA and NTA to the corresponding iron(III) complexes, two aliquots of the sample solution were separately passed through the columns. The iron(III)–EDTA complex was stable in both columns but iron(III)–NTA complex was completely decomposed in the hydrogen-form resin column, therefore, both of iron(III)–EDTA and –NTA were found in the effluent of sodium form resin column but only iron(III)–EDTA was found in the effluent of hydrogen-form resin column. The complexes in the respective effluents were determined spectrophotometrically at 255 nm. The recovery tests of EDTA and NTA from the synthetic sample solutions containing various metal ions were examined and the results observed were satisfactory.
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