水酸化ジルコニウム(IV)共沈/微分パルスアノーディックストリッピングボルタンメトリーによる底質中の微量の銅及び鉛の同時定量

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The simultaneous determination of copper and lead in sediments was achieved by means of coprecipitation with zirconium hydroxide and differential pulse anodic stripping voltammetry. Zirconium oxychloride solution containing 20 mg zirconium was added to 50 ml of sample solution containing 0.04 g of sediments and the pH was adjusted to 8.8 with ammonia water (1 : 2). The precipitate was separated by filtration and then dissolved in 25 ml of 4 M hydrochloric acid. This solution was diluted to 50 ml with distilled water. A portion of this solution was employed for the simultaneous determination of copper and lead. After bubbling nitrogen gas through the sample solution for 100 s, it was pre-electrolyzed for 100 s. The potential was scanned from -0.70 V to 0.10 V vs. SCE for dissolution of copper and lead ions, which were determined from the peak current of the voltammogram. The results are as follows : (1) Zirconium hydroxide was the most effective collector of copper and laed when the pH was adjusted to 8.8 with ammonia water (1 : 2). (2) Bismuth (III) and arsenic(III) ions were found to interfere with the determination of copper. Thallium(I), tin(II) and arsenic(III) ions were found to interfere with the determination of lead. (3) This method is applicable to the simutaneous determination of trace amounts of copper and lead in river-bottom and sea floor sediments.
社団法人日本分析化学会の論文
1995-01-05