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在PH值为3.5～4的弱酸性介质中,铜(Ⅱ)于碘化钾作用游离出碘,以淀粉为指示剂,用硫代硫酸钠标液滴定测定氧化铜矿中铜的含量。用99.99%的纯铜标定硫代硫酸钠标准溶液,并用两个有证标准物质对该标定系数进行考察。选取十六个日常分析样品,与电解重量法比对,并且选取第二家具有国际资质化验室SOCIETE GENERALE DE SURBEILLANCE(SGS)对该批样品检测,结果均令人满意。
In mild acid medium with PH value of 3.5 ~ 4, copper (Ⅱ) free iodine from potassium iodide, and starch as indicator, the titration of sodium thiosulfate was used to determine the content of copper in copper oxide. Calibration of sodium thiosulfate standard solution with 99.99% pure copper and examination of the calibration factor with two certified reference materials. Sixteen routine samples were selected for comparison with electrolytic gravimetric method and the second sample was tested by SOCIETE GENERALE DE SURBEILLANCE (SGS) with satisfactory results.