| Continuous Determination of Zinc and Rare-earth Amounts in Rare-earth Zinc Oxide |
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| DOI： |
| Key Words: rare-earth zinc oxide；EDTA titrant replacement；continuous determination |
| Author Name | Affiliation | | Li Zhicheng | Henan Tyre Factory |
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| Abstract: |
| The continuous determination of zinc amd rare-earth amounts in rare-earth zinc oxide was investigarcd.The iron，aluminium and copper ions were respectively screened by ascorbic acid，sulfosalicylic acid and thiourea in an acidulous medium；the total amounrs of zinc and rare-earth were determined by titrating with EDTA titrant in hexamine buffer solution with 5.5pH till the xylenol orange indicator discolored；then EDTA in the rare-earth complex was replaced with ammonia fluoride，and the amount of rare-earth was determined with the standard zinc solurion.The method featured reliable principle，simple operation，fast determination and accurate results. |
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