Journal of the Korean Chemical Society (대한화학회지)

Korean Chemical Society (대한화학회)
권호 표지

Determination of Cr(Ⅵ) by Glassy Carbon and Platinum Electrodes Modified With Polypyrrole Film

폴리피롤 막으로 변성시킨 유리질 탄소 및 백금 전극에서 Cr(Ⅵ) 이온의 정량

  • Yoo, Kwang Sik (Department of Chemistry, College of Natural Science, Ulsan University) ;
  • Woo, Sang Beom (Department of Chemistry, College of Natural Science, Ulsan University) ;
  • Jyoung, Jy Young (Department of Chemistry, College of Natural Science, Ulsan University)
  • 유광식 (울산대학교 자연과학대학 화학과) ;
  • 우상범 (울산대학교 자연과학대학 화학과) ;
  • 정지영 (울산대학교 자연과학대학 화학과)
  • Published : 19990800

Abstract

Studies have been carried out on the fabrication of PPy/GC and PPy/Pt electrode modified with polypyrrole film and determination of Cr(VI) by using 3-electrode system with modified electrodes. Modified electrodes were able to easily fabricated by cyclic voltammetry scanned from +1.0V to -1.0V(vs. Ag/AgCl) at 50 mV/sec. Film thickness could be controlled at same condition by the number of cycling up to 26 times. Reduction behaviour of Cr(VI) at PPy/GC electrode could be seen at wide potential ranges from +0.6V to -0.5V(vs. Ag/AgCl), and maximum reduction peak potential of the ion was observed at -0.25V(vs.Ag/AgCl). Calibration graph at its potential was linear from 0.1 ppm to 80.O ppm. Slope factor and relative coefficient were 1.75 mA/ppm and 0.998, respectively. Reduction behaviour of Cr(VI) at PPy/Pt electrode was similar to PPy/GC electrode, Calibration graph was linear from l.0 ppm to 60.0 ppm. Slope factor and relative coefficient were 0.5mA/ppm and 0.923, respectively. But PPy/GC modified electrode had about 3 times higher sensitivity than PPy/Pt modified electrode. Reduction behaviour of Cu(II), As(IlI), Pb(II), and Cd(II) couldn't be seen at PPy/GC electrode,Its metals had not lnterfered with Cr (VI) determination.

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