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Determination of Hg 2+ Ions Using Electrodes Modified with Dithia‐Podands Having Different End Alkyl Chain Lengths
Author(s) -
Won MiSook,
Bae YunJung,
Lee ShimSung,
Shim YoonBo
Publication year - 2001
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/1521-4109(200108)13:12<1003::aid-elan1003>3.0.co;2-v
Subject(s) - detection limit , alkyl , differential pulse voltammetry , analytical chemistry (journal) , ion , electrode , chemistry , linear sweep voltammetry , calibration curve , voltammetry , cyclic voltammetry , materials science , electrochemistry , chromatography , organic chemistry
A series of dithia‐podands ( 1–3 ) having different chain lengths (C 6 –C 12 ) of alkyl endgroups has been used to modify the glassy carbon electrode by a spin coating method for the analysis of trace amounts of Hg. The analytical parameters that affect the electrode reaction process have been studied in terms of pH, preconcentration temperature, preconcentration time, influence of interference from other ions, and the effect of the length of the alkyl endgroup of ligands using linear sweep voltammetry (LSV) and differential pulse voltammetry (DPV). The calibration plot using 1 yields a linearity between 1.0×10 −6 M and 7.0×10 −8 M and the least‐square treatment of these data produced an equation of I [μA] = 128.78 [μA] + 16.66 log C with r =0.997 ( n =6). On the basis of signal to background characteristics of the response ( S / N =3), the detection limit was about 3.0×10 −8 M of Hg 2+ ion at 25 min preconcentration time. This method was verified by applying for the analysis of Hg 2+ ion in a human urine sample (SRM 2670, NIST).