摘要
用非抑型制离子色谱法分离测定了Ｌａ３＋，Ｃｅ３＋，Ｐｒ３＋，Ｎｄ３＋，Ｓｍ３＋和Ｙｂ３＋等６种稀土离子。研究了流动相（乙二胺－柠檬酸、乙二胺－草酸、乙二胺－酒石酸）对稀土离子分离状况的影响，确定分析６种稀土离子的最佳流动相为０．２５ｍｍｏｌ／Ｌ乙二胺－０．５０ｍｍｏｌ／Ｌ柠檬酸（ｐＨ４．５０）。在选定的实验条件下测得了稀土离子的检出限、线性范围、工作曲线和相对标准偏差，应用于农用稀土液的分析，结果良好。方法具有简便、准确等优点。
Separation and determination of six rare earth ions including La 3+ ,Ce 3+ ,Pr 3+ ,Nd 3+ ,Sm 3+ and Yb 3+ by nonsuppressed ion chromatography is described. The separation column was Shim pack IC Cl cation exchange column (150mm×5.0mm i.d.). The detector was Model CDD 6A conductivity detector. The optimum mobile phase was 0.25mmol/L ethylenediamine 0.50mmol/L citric acid (pH 4.50) with a flow rate of 1.0mL/min. In all experiments, 20μL sample was injected. The ion chromatogram of rare earth ions is given. The effects of mobile phase composition including ethylenediamine citric acid, ethylenediamine oxalic acid and ethylenediamine tartaric acid on separation of six rare earth ions were investigated. The interference of some alkaline earth and transition metal ions on the determination of rare earth ions can be eliminated by selecting mobile phase composition. In the condition of optimum mobile phase composition, Na +, NH + 4, K +, Ca 2+ , Sr 2+ , Ba 2+ , Cu 2+ , Cd 2+ ,Fe 3+ , Al 3+ and Cr 3+ do not interfere with the determination of rare earth ions. The detection limits (signal to noise ratio=2) for La 3+ , Ce 3+ , Pr 3+ , Nd 3++ , Sm 3+ , and Yb 3+ were 0.23, 0.16, 0.14, 0.13, 0.12 and 0.10mg/L, the RSDs (n=5) were 1.91%, 2.05%, 2.06%, 1.87%, 2.48% and 1.92%, the linear ranges of calibration curve were 0.23 50, 0.16 50, 0.14 50, 0.13 50, 0.12 40 and 0.10 30mg/L, respectively. The method was applied for determining a solution of rare earth ions for agricultural uses. The recoveries of added standard were 95.5% 101.5%. This method is simple, reapid and accurate .
出处
《色谱》
CAS
CSCD
北大核心
1998年第4期358-360,共3页
Chinese Journal of Chromatography
基金
黑龙江省教委基金
关键词
离子色谱法
分离
测定
镧
铈
镨
钕
钐
镱
ion chromatography, rare earth ions, separation and determination
