Dithiocarbamates as a Sensitive Electroanalytical Reagent: Determination of Chromium by Catalytic Hydrogen Wave at DME in Water Systems and Vegetables |
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Authors: | S Kanchi M Sulochana K Babu Naidu K Saraswathi Nuttalapati Venkatasubba Naidu |
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Affiliation: | (1) Department of Chemistry, S. V. University, Tirupati, 517502, Andhra Pradesh, India; |
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Abstract: | Simple, sensitive catalytic hydrogen polarographic method was developed for the determination of chromium (VI) with ammonium
piperidine dithiocarbamate (Amm Pip-DTC) and ammonium morpholine dithiocarbamate (Amm Mor-DTC) in various water systems and
vegetables. The method was based on the catalytic hydrogen wave of Amm Pip-DTC-Cr(VI) and Amm Mor-DTC-Cr(VI) complexes in
the presence of NH4Cl–NH4OH medium at pH 7.5 and 9.6 and produce a catalytic hydrogen waves at −1.59 and −1.65 V Vs SCE, respectively. Various optimum
parameters such as effect of pH, NH4Cl–NH4OH, Pip-DTC, metal ion concentrations and excipient effect on peak height were investigated to enhance the sensitivity, selectivity,
and detection limits of the present method and compared in terms of Students t test and variance ratio f test with differential pulse polarography (DPP) method. The proposed method was applied for the determination of chromium
(VI) in various water system and vegetables and the results obtained were in good agreement with DPP. |
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