Abstract
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 μg hydrogen sulfide. The relative standard deviation for ten determinations at 10 μg H 2S 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 2S present in a laboratory fume hood and the results were compared with those of the standard methylene blue method.
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