Determination of zinc content in regenerated zinc material by EDTA
Received:August 11, 2018  Revised:January 20, 2019
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KeyWord:titration method; regenerated zinc material; zinc
     
AuthorInstitution
FAN Lixin 北矿检测技术有限公司
TANG Shufang 北矿检测技术有限公司
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Abstract:
      The new determination method of zinc in regenerated raw material is established. Sample is decomposed by ammonium fluoride-hydrochloric acid-nitric acid-sulfuric acid, and the coexisting elements such as iron, manganese and lead are separated by ammonia water precipitation. A small amount of interfering elements were masked by adding a masking agent to the filtrate, and the zinc in the filtrate was titrated with EDTA standard titration solution in an acetic acid-sodium acetate buffer solution of pH 5-6, using xylenol orange as an indicator. The measured results combined with the amount of zinc and cadmium, and the amount of zinc is obtained by deduction the amount of cadmium. The relative standard deviations(RSD, n=11) of determination result were between 0.15% and 1.03%.The recoveries in samples of silver slag were between 99.1% and 101.6%.This method could meet the requirements of daily analysis of zinc content in regenerated zinc material.
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