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Selective Cosmetic Mercury Analysis Using a Silver Ink Screen‐Printed Electrode with Potassium Iodide Solution
Author(s) -
Chiu MeiHsin,
Zen JyhMyng,
Kumar Annamalai Senthil,
Vasu Dhananjayan,
Shih Ying
Publication year - 2008
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200804307
Subject(s) - detection limit , iodine , iodide , mercury (programming language) , chemistry , analytical chemistry (journal) , anode , electrode , voltammetry , potassium , electrochemistry , inorganic chemistry , chromatography , organic chemistry , computer science , programming language
A new method for selective determination of trace mercury has been demonstrated by linear scan voltammetry using silver ink screen printed electrode (AgSPE) in presence of potassium iodide (KI) dissolved 0.05 M H 2 SO 4 solution. At AgSPE, iodide oxidation peak current signal found to be systematically decreased (inhibitory current anodic peak current signal, i $\rm{ {_{pa}^{in}}}$ ) with increase in the Hg concentrations, [Hg]. This observation is further utilized for construction of new Hg electroanalytical assays in this work. On the AgSPE, Hg inhibitory detection potential found at 0 V vs. Ag/AgCl, which is 720 mV lower than that of unmodified SPE system. Under optimal experimental conditions, i $\rm{ {_{pa}^{in}}}$ signals were linearly increased against [Hg] in the window of 500–4500 ppb (40 μM KI) with a correlation coefficient ( r ) of 0.9988. The limit of detection ( LOD ) and limit of quantification ( LOQ ) were 98 and 318 ppb, respectively. This approach was further utilized to analyze hidden Hg in the cosmetic samples. Real sample assays were consistent with that of result obtained from ICP‐OES, which confirm the applicability of the proposed method for practical applications.