| 稀土氧化锌中锌及稀土含量的连续测定法 |
| Continuous Determination of Zinc and Rare-earth Amounts in Rare-earth Zinc Oxide |
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| DOI： |
| 中文关键词: 稀土氧化锌 EDTA标准滴定溶液 置换 连续测定方法 |
| 英文关键词: rare-earth zinc oxide EDTA titrant replacement continuous determination |
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| 中文摘要: |
| 研究了稀土氧化锌中锌及稀土含量的连续测定方法。用抗坏血酸、磺基水杨酸及硫脲在微酸性介质中分别掩蔽铁、铝及铜离子；在pH=5.5的六胺缓冲溶液中用EDTA标准滴定溶液滴定至二甲酚橙指示剂变色测定锌及稀土总量；继用氟化铵置换出与稀土元素络合的EDTA，用锌标准溶液测得稀土含量。此方法具有原理可靠、操作简便、测定快速、结果准确等特点。 |
| 英文摘要: |
| 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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