Determination of free acid in rare earth solution by a fixed pH method
Determination of free acid in rare earth solution by a fixed pH method
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DOI：
10.1039/b9ay00187e
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发表时间：
2010
影响因子：
3.1
通讯作者：
Zhaowu Zhu;Zhenyu Bian;Zhi-qi Long
中科院分区：
文献类型：
--
作者：
Zhaowu Zhu;Zhenyu Bian;Zhi-qi Long
建立了一种固定pH法测定含大量稀土，特别是Ce（IV）溶液中游离酸的方法。以Ca-EDTA为掩蔽剂，在固定pH为4.5的条件下，测定了含Ce（IV）约50 g/L、稀土约100 g/L的溶液中游离酸的含量，相对标准偏差（RSD）小于1%。对于已知量的H2SO 4溶液，5组50次测量的偏差误差为-1.44%。与其它方法相比，该方法具有精密度高、准确度高、操作简便、不需要指示剂等优点。
A fixed pH method was developed for free acid determination in solutions containing large amounts of rare earths, especially Ce(IV). With Ca–EDTA as the masking regent at a fixed pH of 4.5, free acid was determined in a solution containing about 100 g/L of rare earths including about 50 g/L Ce(IV) with a relative standard deviation (RSD) of less than 1%. The deviation error for 50 measurements in 5 groups for a known amount of H2SO4 solution was −1.44%. Compared with other reported methods, the newly developed method has the advantages of higher precision, higher accuracy, simpler procedure and no need for an indicator.