Study of the preconcentration and determination of ultratrace rare earth elements in environmental samples with an ion exchange micro-column
Study of the preconcentration and determination of ultratrace rare earth elements in environmental samples with an ion exchange micro-column
复制标题
离子交换微柱富集测定环境样品中超痕量稀土元素的研究
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
G. Alaerts
中科院分区：
文献类型：
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作者：
W. Zhu;E. D. de Leer;M. Kennedy;G. Alaerts
摘要采用微型离子交换柱对环境样品中超痕量稀土元素(REE)进行了预富集和电感耦合等离子体质谱(ICPMS)测定。对预富集条件进行了优化，在pH为4~6的范围内，稀土回收率约为100%，离子强度(μ)小于0.18。离子交换柱对稀土元素的容量估计为0.96mmoL/g，线性响应系数在0.995-0.997之间。如果对缓冲液和水进行净化，可将空白中的浓度降至最低(0.09~3.1pgmL-1)。该方法的检出限为0.03~0.40pgmL-1，预富集系数为100。用合成标准溶液和实际样品对方法的精密度和准确度进行了评价。结果表明，稀土加标回收率为88.1%~100.2%，相对标准偏差为2.7%~6.7%。该方法用于原水、纯净水、自来水以及环境水样中稀土元素的测定，结果满意。同时，该方法简单、灵活。
Abstract A study was carried out on the preconcentration of ultratrace rare earth elements (REEs) in environmental samples with a micro ion-exchange column and determination by inductively coupled plasma mass spectrometry (ICP-MS). The preconcentration parameters were optimized and the REE recovery was ca. 100% in the pH range 4 to 6 with an ionic strength (μ) less than 0.18. The ion-exchange column capacity with respect to REEs was estimated as 0.96 mmol/g. The linear response coefficients ranged from 0.995 to 0.997 at the pg mL–1 level. The concentration in the blank could be minimized (0.09 to 3.1 pg mL–1) if the buffer solution and the water were purified. The detection limits ranged from 0.03 to 0.40 pg mL–1, for a preconcentration factor of 100. The precision and accuracy of the method was evaluated with a synthetic standard solution and real samples. Results indicated that the REE recovery ranged from 88.1% to 100.2%, and the RSD ranged from 2.7% to 6.7%. Satisfactory results were achieved when this method was applied for the determination of REEs in raw water, purified water and tap water, as well as in environmental aquatic samples. Meanwhile, the method is simple and flexible.