高周波ポーラログラフによる微量ヒ素の定量 : 食品中の微量成分に関する研究(第2報)

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H. F. polarographic behaviours of As (III) are investigated for a polarographic determination of trace amounts of arsenic. A single peak wave of As (III) was obtained in ammonium or potassium salt solutions in the presence of small amounts of mineral acid, although no reduction wave was appeared in the neutral solutions. The peak potential shifted to negative side as the concentration of the salt enhanced, and to positive side when the amounts of acid increased. The well-refined reduction wave of As (III) was produced in 0.5M NH4Cl-5×10-3 N HCl or 0.5M KCl-1×10-2 N HCl at 100 kc. The calibration curves were linear in the range of 5×10-7_??_2×10-5M As2O3. Cu (II), Pb (II), Al (III) and Fe (III) ions did not influence the determination. Co (II), Ni (II), Zn (II), Fe (II), Cd (II) and Mn (II) ions interfered it, but, by the addition of EDTA, the interferences were completely eliminated except Cd (II) of over 20 times of arsenic.
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