Journal Title
Title of Journal: J IRAN CHEM SOC
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Abbravation: Journal of the Iranian Chemical Society
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Publisher
Springer Berlin Heidelberg
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Authors: Philiswa N Nomngongo J Catherine Ngila
Publish Date: 2015/07/10
Volume: 12, Issue: 12, Pages: 2141-2147
Abstract
A sensitive selective and reproducible method for quantification of mercury in gasoline and diesel samples has been developed The procedure is based on the retention of HgII in hollow fibersupported sol–gel combined with Ambersep GT74 cation exchange resin The retained HgII was determined by square wave anodic stripping voltammetry SQWASV at gold nanoparticlemodified screen printed carbon electrodes AuNPsSPCEs The optimization of different experimental parameters affecting the hollow fiber solid phase microextraction HFSPME coupled to SQWASV HFSPMESQWASV procedure was performed using multivariate strategy Under optimized conditions a preconcentration factor of 854 was achieved The repeatability n = 20 and reproducibility n = 10 expressed in terms of relative standard deviation RSD were 3 and 53 respectively The limits of detection and quantification in the original sample were 10 and 30 ng L−1 respectively The accuracy of the developed HFSPMESQWASV method was tested by the analysis of spiked samples and the recovery percentages ranged from 96 to 100 The proposed method was applied for quantification of HgII in commercial gasoline and diesel samples The concentrations of Hg determined using the developed method was compared with those obtained using ICPMS after microwaveassisted digestion According to the Student t test the results obtained were in close agreement not significantly different at 95 confidence level
Keywords:
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