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Conversion techniques in flow injection analysis: Determination of Sulphide by Precipitation with Cadmium Ions and Detection by Atomic Absorption Spectrometry

✍ Scribed by Bo A Petersson; Zhaolun Fang; Jaromir Růžička; Elo H Hansen

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

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✦ Synopsis

A flow-injection system is described for on-line conversion of a soluble species to an insoluble compound by means of a tag-material which subsequently can be determined. This approach is used for the determination of sulphide by flame atomic absorption spectrometry, cadmium(I1) ions being used as the precipitating tag-reagent. Excess of cadmium(I1) is collected on a chelating ion-exchanger and later eluted. The detection limit for sulphide was 10 rg 1-l and the sampling rate was 100 h-l. Typical relative standard deviation was 1.2%. Of the potential interferences tested, only phosphate had any effect.

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