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Voltammetric Behavior of Mercury( I , II ) Ions at an Amide‐Functionalized Humic Acids Modified Carbon Paste Electrode
Author(s) -
Wang Chunming,
Li Hulin
Publication year - 1998
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/(sici)1521-4109(199801)10:1<44::aid-elan44>3.0.co;2-o
Subject(s) - chemistry , cyclic voltammetry , mercury (programming language) , inorganic chemistry , fourier transform infrared spectroscopy , humic acid , anodic stripping voltammetry , voltammetry , electrode , electrolyte , amide , electrochemistry , supporting electrolyte , organic chemistry , chemical engineering , fertilizer , computer science , engineering , programming language
Amide‐functionalized humic acids (AHA) was synthetized by two step reactions, in which humic acids first reacted with thionyl chloride(SOCl 2 ) and then reacted with ammonia liquor. The AHA was characterized by Fourier transform infrared (FTIR) spectra and elemental analysis method. The reaction properties between AHA and mercury ions( I , II ) were investigated at an AHA chemically modified carbon paste electrode (AHA‐CMCPE) using cyclic voltammetry (CV) and linear sweep stripping voltammetry (LSSV). Moreover, the binding behavior of numerous other ions at the AHA‐CMCPE was also tested. In an open circuit, Both Hg I and Hg II were accumulated from a stirred 0.1M H 2 SO 4 solution onto the AHA‐CMCPE. The subsequent electrochemical measurement was performed in another clean supporting electrolyte of 0.5M H 2 SO 4 . Factors affecting the accumulation and electrode reaction steps were investigated and an optimized procedure for quantifying mercury was developed. Under optimized conditions, a calibration plot for mercury concentration in the range 4.98 × 10 −6 –4.98 × 10 −8 M was obtained. The new electrode can be used to determine mercury whether in the Hg I or Hg II forms.