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Kinetic spectrophotometric determination of traces of sulphite

✍ Scribed by A. Safavi; A.A. Ensafi

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
591 KB
Volume
252
Category
Article
ISSN
0003-2670

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✦ Synopsis

A method for the determination of sulphite is based on the addition reaction of sulphite with Brilliant Green at pH 7 and 25 o C. The decrease in absorbance of Brilliant Green (X,, = 615 nm) over a fixed time is proportional to the concentration of sulphite over the range of 10-1200 ng ml-'. The limit of detection was found to be 5 ng ml-!. Five replicate analyses of a sample solution containing 1 pg ml-' sulphite gave a relative standard deviation of 1%. The interferences of various ions were studied. A cation-exchange resin was used for removal of interfering ions. The method was applied to the determination of sulphite in fruit juices.

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