Determination of Iron in Scrap Copper by Dichromate Titration Method
Received:March 27, 2021  Revised:April 01, 2021
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DOI:10.3969/j.issn.2095-1035.2021.04.014
KeyWord:scrap copper;dichromate titration;iron
     
AuthorInstitution
miaoxiaohuan 北矿检测技术有限公司
FENG Zhenhua 北矿检测技术有限公司
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Abstract:
      The determination method of iron content in scrap copper was studied. The samples are dissolved by hydrochloric acid, nitric acid and perchloric acid, and added with excessive ammonia to form ferric hydroxide precipitation and separated from interfering elements such as copper, chromium and other interfering elementsc. The precipitate is dissolved with hot hydrochloric acid, and the stannous chloride is used for reduction until the solution is reduced to pale yellow, then titrate with potassium dichromate to determine the content of iron. The influence on the determination was discussed including the method of sample dissolution, the amount of ammonium chloride, the excess volume of ammonia and the amount of sulfur-phosphorus mixed acid. According to the method, the content of iron in four scrap copper samples was determined. The relative standard deviation (RSD) of the method was 0.38 %~ 0.95%, and the recovery rate of the sample was between 99.35 %~ 100.17 %. The method is accurate and reliable, which is suitable for the determination of iron content in scrap copper.
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