Determination of Zinc Oxide Content in Zinc Containing Materials by EDTA Titration
Received:August 26, 2016  Revised:December 08, 2016
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DOI:doi:10.3969/j.issn.2095-1035.2017.02.016
KeyWord:material containing zinc; zinc oxide; phase; EDTA
                 
AuthorInstitution
WEI Yajuan 中国检验认证集团广西有限公司,广西 防城港
WU Xueying 中国检验认证集团广西有限公司,广西 防城港
ZHONG Guiyuan 中国检验认证集团广西有限公司,广西 防城港
YE Lingling 中国检验认证集团广西有限公司,广西 防城港
LI Liangjun 中国检验认证集团广西有限公司,广西 防城港
HUANG Shiming 中国检验认证集团广西有限公司,广西 防城港
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Abstract:
      A new method for the determination of zinc oxide in Zinc containing material was established. The sample was dissolved with ammonium chloride-ammonia, and after dry filtering, barium chloride and sulfuric acid were added into the filtrate to precipitate lead ions. The lead sulfate precipitation was separated by filtering. Masking agent such as ascorbic acid, potassium fluoride and sodium thiosulfate were added into the filtrate to mask the small amount of interference ions. In the ethanoic acid-sodium acetate buffer solution with pH5~6 and with xylenol orange as the indicator, the solutions were titrated with Na2EDTA standard solution. The total amount of zinc oxide, water soluble zinc and cadmium in the filtrate were obtained from the titration results. The zinc oxide content was calculated by deducting the amount of cadmium and water soluble zinc, which were separately determined by flame atomic absorption spectrometry, from the total amount of zinc oxide, water soluble zinc and cadmium. Various?experimental?conditions and factors, such as total amount of ammonium, ratio of ammonium chloride to ammonia, solution addition amount, stirring time, co-existing ions interference, and precision, etc., were studied.?An analytical method for the determination of zinc oxide phase in zinc containing materials by EDTA titration method was established. The effect of various experimental conditions was studied in detail.The results showed that the precision (RSD) of this method was between 0.25% and 0.54% and the recovery rate was in the range of 99% to 104%, when the zinc oxide content was between 24% and 83%. This method can meet the requirement for the determination of zinc oxide content in zinc containing materials.
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