1-ピロリジンジチオカルバミン酸アンモニウムを用いる銅(II)の重量分析

概要

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Ammonium 1-pyrrolidine dithiocarbamate (NH_4pdtc) was used for a gravimetric determination of Cu (II). Cu (II) ion in the solution was quantitatively precipitated as [Cu (pdtc)_2] in the pH range 1〜12, when a small excess of NH_4pdtc solution was added. The precipitate was not decomposed at 60℃ for 6h in contact with mother liquor, and was stable on heating up to 140℃ after filtration. The procedure for the determination of crystalline copper (II) sulfate was following : crystalline copper (II) sulfate (containing 10〜100mg of copper) was dissolved in 200cm^3 water, a 0.1% NH_4pdtc solution was added to the solution until precipitation was completed. After the adjustment of pH to 8.0〜9.5, the mixture was allowed to stand at 60℃ for 1h. The precipitate was filtrated, washed with hot water, dried at 110℃, and weighed. This method is accurate and precise, e. g., the mean of relative errors and the relative standard deviation obtained for 20mg of copper were 0.1% and 0.1% (n=6), respectively. This method is suitable for standardizing a Cu (II) solution containing no other heavy metal ion.
社団法人日本分析化学会の論文
1987-07-05