Determination of lead by titration with EDTA

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Other Title
  • EDTAによる鉛の定量法
  • EDTA ニ ヨル ナマリ ノ テイリョウホウ

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Description

A rapid, simple accurate method for a determination of lead was attempted by titration with EDTA using Cu-PAN as an indicator.<BR>Conditions for titration and for separation from the interfering substances were investigated, and a suitable procedure was established. The outline is as follows:<BR>The sample was treated with HNO3 and H2SO4, and lead was precipitated as lead sulfate. After separating by filtration, the precipitate was dissolved in NH4C2H3O2-HC2H3O2 solution. The solution was boiled for a few minutes and titrated immediately with a standard solution of EDTA at about pH 5 using Cu-PAN as an indicator. The end point was noticed by a sharp change from red to yellow.<BR>By this procedure, the interfering metals were removed with an exception of Ba, Ca, W and some insoluble matters. Ca does not interfere the determination at the proposed pH. Since Ba and W both interfere and give lower values, they must be separated preliminarily from lead. The various samples can be analysed by this method with reliable results. The time required for an analysis is about 23 hours.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 9 (2), 87-91, 1960

    The Japan Society for Analytical Chemistry

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