Abstract
The cyclic renewable mercury film silver based electrode (Hg(Ag)FE), applied for fast determination of elemental sulfur using differential pulse cathodic stripping voltammetry (DP CSV) is presented. The calibration graph obtained for S(0) is linear from 5nM (0.16μgL−1) to 350nM (11.2μgL−1) for a preconcentration time of 30s, with correlation coefficient of 0.9994. For a Hg(Ag)FE with a surface area of 7.1mm2 the detection limit for a preconcentration time of 60s is as low as 0.04μgL−1. The repeatability of the method at a concentration level of the analyte as low as 0.8μgL−1, expressed as RSD is 3.7% (n=5). The proposed method was successfully applied and validated by studying the recovery of S(0) from spiked synthetic solutions and real fuel samples.
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