ジチゾンおよび亜鉛ジチゾン錯体を指示薬とするEDTA滴定

概要

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Ni, Cd, Bi, and In in 60% ethyl alcohol solution at pH4.5 were respectively titrated with 0.025M EDTA, using an alcoholic solution of dithizone as an indicator and, accurate results were obtained for 120mg Ni, 280mg Cd, 4130mg Bi, and 350mg In. Since Zn-dithizone was as effective as Cu-PAN as an indicator, La, Ce(III), and Fe(II) at pH4.5, Th at pH3.0, Mn at pH6.0, V(IV) at pH3.5, and Ca at pH12, respectively in 60% ethyl alcohol, were titraed with 0.025M EDTA, using Zn-EDTA with dithizone as an indicator, and accurate results were obtained for 125mg Mn, 4110mg La, 855mg Ce, 1080mg Th, 125mg Fe, 427mg V, and 120mg Ca with a clear end point.