Determination of Silver by Hydrazine Hydrate Reduction Using Gravimetric Method
Received:March 17, 2010  Revised:May 03, 2011
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DOI:10.3969/j.issn.2095-1035.2011.02.0015
KeyWord:silver; hydrazine hydrate; gravimetric analysis; EDTA
           
AuthorInstitution
LIAO Qinghua 云南省有色地质测试中心,
ZHANG Meng 云南省有色地质测试中心,
TANG Jinsong 云南省有色地质测试中心,
CHEN Yunpin 云南省有色地质测试中心,
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Abstract:
      After samples were decomposed by nitric acid, the metal ions of lead, iron and alumina were separated with excess ammonia solution. The ions of cupper, zinc and other residue metals were screened by EDTA. Hydrazine Hydrate was used as a reduction reagent to reduce silver ions to form precipitation of silver elementary substance. After filtering, washing and sintering, constant weight of the sample was obtained and measured. The method is suitable for examining real samples. The result was consistent with that measured by other analytical methods. The error was within the permitted value. The samples which have 2.54% and 10.00% of silver were examined for 12 times, giving the relative standard deviations (RSD) of 1.50% and 0.64%,respectively. The method is suitable for determination of silver with concentration more than 1%.
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