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- E-ISSN 2288-8985
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- P-ISSN1225-0163
- E-ISSN2288-8985
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Spectrophotometric Determination of Trace Amount of Sulfide by Formation of Iodide and Its Solvent Extraction with Mehtylene Green
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1994, v.7 no.3, pp.261-269
Kam,
S., &
Kim,
K.
(1994). Spectrophotometric Determination of Trace Amount of Sulfide by Formation of Iodide and Its Solvent Extraction with Mehtylene Green. Analytical Science and Technology, 7(3), 261-269.
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Abstract
The iodide formed stoichiometrically for sulfide by its oxidation with iodate was extracted as an ion-pair with methylene green into 1,2-dichloroethane and the extract was measured spectrophotometrically at 656nm for the determination of sulfide. Hydrogen sulfide separated from the sample matrix was introduced into a solution containing pH 3.5 acetate buffer and iodate, in which the hydrogen sulfide was completely converted into iodide. A linear calibration graph was obtained over the range <TEX>$3{\times}10^{-7}{\sim}1.2{\times}10^{-5}M$</TEX> sulfide(<TEX>$0.0096{\sim}0.384{\mu}g$</TEX> of <TEX>$S^{2-}/ml$</TEX>) and the detection limit was <TEX>$0.0032{\mu}g/ml$</TEX>. The apparent molar absorptivity and a correlation coefficient(r) were <TEX>$6.7{\times}10^4L\;mole^{-1}\;cm^{-1}$</TEX> and 0.999, respectively. When applied to the stream water samples, the proposed method gave a relative standard deviation of 1.59% at <TEX>$5{\times}10^{-6}M$</TEX> sulfide level.
- keywords
- spectrophotometric determination of sulfide, the formation of iodide for sulfide by its oxidation with iodate, methylene green, separation as hydrogen sulfide from sample matrix, solvent extraction
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