Abstract
A sensitive and precise method for the determination of total sulfur in organic compounds was described. Here, organosulfur compounds were desulfurized by Raney nickel and converted to H 2S. Square-wave voltammetry (SWV) and differential pulse cathodic stripping voltammetry (DPCSV) on a static mercury drop electrode (SMDE) were used for the detection of sulfide ion. The effects of various factors such as scan rate, deposition potential and time, pulse height and concentration of supporting electrolyte were optimized. The 3 σ detection limits were 2 and 25 ng S ml −1 for DPCSV and SWV, respectively. At 1 μg S ml −1 in iso-octane the relative standard deviations ( n = 5) are ±1.7% and ±4.5% for SWV and DPCSV, respectively.
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