階段波掃引たたみ込み積分ポーラログラフ

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書誌事項

タイトル別名
  • A staircase convolution polarograph
  • カイダンハ ソウインタタミコミ セキブン ポーラログラフ

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抄録

A Staircase convolution polarograph was constructed. In this polarograph, the staircase voltammetry current, i, is converted to a new function, Ic, which represents the change of the surface concentration of depolarizer, by Ichise's s-1/2 module according to eq. (1)<BR>Ic=∫t0i(η)/√π(t-η)dη……(1)<BR>Theoretical expression of the current vs. potential curves in staircase voltammetry and staircase convolution voltammetry with the step voltage of ΔE and the step interval of τ are discribed as nondimensional functions (2) and (3), <BR>ψs(j, Δζ)=i√τ/nFA*C√D……(2)<BR>φs(j, Δζ)=Ic/nFA*C√D……(3)<BR>for an n-electron reversible reduction step, where Δζ=nFΔE/RT, t=jτ with j=1, 2, 3, …, A=electrode surface area and other symbols have usual meanings. Experimental results generally agreed with theoretical predictions (for 10 ppm Cd2+ in 0.1 M KCl with Hanging mercury drop electrode). By staircase convolution voltammetry the charging current was effectively eliminated and linear correlations between Ic and concentration were obtaind for Cd2+ and Pb2+ in the concentration range from 10-7 to 10-4 M.

収録刊行物

  • 分析化学

    分析化学 28 (12), 743-748, 1979

    公益社団法人 日本分析化学会

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