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Determination of iodate and periodate at the microgram level by a kinetic method

✍ Scribed by A. Garrido; M. Silva; D. Pérez-Bendito

Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
522 KB
Volume
184
Category
Article
ISSN
0003-2670

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✦ Synopsis

A procedure is reported for the kinetic determination of iodate/periodate mixtures based on the reduction of these anions by the iron(II)/dipyridylglyoxal dithiosemicarbazone complex in an acidic medium. The reaction is monitored spectrophotometrically at 410 nm (absorption maximum of the iron(II1) complex formed). Mixtures of these anions at rg ml-' levels for iodate/periodate ratios from 5:l to 1:4 can be determined with a r.s.d. of ca. 3%. Molybdate is used to mask periodate to allow iodate to be determined alone. The sum of both anions is obtained in the absence of molybdate. Chromate, hypochlorite and hexacyanoferrate(II1) interfere seriously.

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