Complexometric Titration of Metals Using a Lead Selective Electrode

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Abstract
A solid state lead selective electrode is used satisfactorily to indicate the end point eufing the complexometric titration of Ni, Co, Zn and V (IV) with EDTA, CDTA, and DTPA, in presence of a small amount of the corresponding lead complex. The optimum pH for the titration was in the range of 4.0 to 6.0. The quantity of lead complex used was variable and should be determined in each case. The best results are obtained when the metals being determined are present in the range of 25 to 50 micromoles. Nickel, cobalt, and zinc give good results with DTPA at pH 6.0; vanadium(IV) gives excellent results with any of the three reagents in the pH range of 4.0 to 6.0.