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Spectrophotometric determination of sulfide in the presence of sulfite and thiosulfate via the precipitation of bismuth(III) Sulfide
Miura, Y and Fujisaki, M and Haddad, PR (2004) Spectrophotometric determination of sulfide in the presence of sulfite and thiosulfate via the precipitation of bismuth(III) Sulfide. Analytical Sciences, 20 (2). pp. 363-367. ISSN 0910-6340
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A photometric method has been developed for the determination of sulfide at 10-5 mol dm-3 levels, which is based on the reaction of sulfide with a given excess amount of bismuth(III) to form a precipitate of bismuth(III) sulfide and on the spectrophotometric measurement of the residual bismuth(III) at 335 nm after extracting with bismuthiol II reagent from an aqueous solution containing acetate buffer into benzene. The presence of sulfite and thiosulfate up to 0.002 mol dm-3 did not cause any interference in the determination of sulfide, because both sulfite and thiosulfate do not produce any precipitate with bismuth(III). A linear calibration plot with a negative slope was obtained for sulfide over the range of 5.00 × 10-7 - 3.00 × 10-5 mol dm-3 (16.0 - 960 ppb). An experimental calibration plot was in accord with the theoretical plot, taking into account the known excess of bismuth(III), showing that the reaction of sulfide with bismuth(III) proceeded to completion. The relative standard deviation of results from 10 replicate determinations of standard sulfide (2.00 × 10-5 mol dm-3) was 0.44%. The proposed method was successfully applied to the determination of sulfide in hotspring water samples without any pretreatment.
|Journal or Publication Title:||Analytical Sciences|
|Page Range:||pp. 363-367|
|Identification Number - DOI:||10.2116/analsci.20.363|
|Additional Information:||Copyright © 2006 The Japan Society for Analytical Chemistry|
|Date Deposited:||03 Oct 2008 06:23|
|Last Modified:||18 Nov 2014 03:51|
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