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A Simple Spectrophotometric Method for the Determination of Hydrogen Sulfide Based on Schiff's Reaction

✍ Scribed by Krishnamoorthy Shanthi; Natesan Balasubramanian

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 82 KB
Volume: 53
Category: Article
ISSN: 0026-265X
DOI: 10.1006/mchj.1996.0024

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✦ Synopsis

A simple and sensitive spectrophotometric method for the determination of trace amounts of hydrogen sulfide after fixation in a zinc acetate trapping solution is described. The fixed sulfide was made to react with formaldehyde to form a hydrosulfide adduct which reacts with pararosaniline in an acid medium to form a colored product. The product was stabilized with gelatin and thiocyanate for the absorbance measurement at 520 nm with a Beer's law range of 0-20 g hydrogen sulfide. The relative standard deviation for ten determinations at 10 g H 2 S is 2.4%. The effect of various interfering gases was overcome by the use of a simple collection procedure. The method was applied to the determination of residual amounts of H 2 S present in a laboratory fume hood and the results were compared with those of the standard methylene blue method.

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