两性离子流动相测定杂多酸中的磷酸根、氯离子和硫酸根
离子色谱,,离子色谱，杂多酸，磷酸根，两性离子,摘要,关键词,1引言,2实验部分,3结果与讨论,4结论,References
摘 要采用离子色谱法测定杂多酸中痕量阴离子。由于常规的淋洗液(如Na2CO3, NaOH)呈碱性，使杂多酸迅速分解生成磷酸根，致使测定结果偏高。实验通过在常规淋洗液中加入适量两性离子后，调节淋洗液的pH为中性，从而能准确测定杂多酸中磷酸根氯离子和硫酸根的含量值。经过比较分别用去离子水和流动相稀释的样品中磷酸根的测定结果，确定淋洗液的最佳条件为2.5 mmol/L Na2CO39.0 mmol/L CHES，在该条件下测定，快速、准确、灵敏，且有较好的灵敏度和重现性。
关键词 离子色谱，杂多酸，磷酸根，两性离子
Determination of Phosphate, Chloride and Sulfate in Heteropoly Acid by Zwitterion Eluent
Chen Yongjing, Li Xiuling, Huang Chaoqun, Zhu Yan*
(Department of Chemistry, Xixi Campus, Zhejiang University, Hangzhou 310028)
Abstract The trace anions in heteropoly acid can be determined by ion chromatography. However, phosphate could hardly be accurately determined due to the decomposition of heteropoly acid under alkaline condition in regular eluent such as Na2CO3, NaOH. This problem can be solved by adding proper amount of 2(cyclohexylamion)ethane sulfonic acid (CHES) to adjust the pH of the eluent so as to prevent the heteropoly acid from discomposing. The optimum condition for determining phosphate, chloride and sulfate in heteropoly acid was 2.5 mmol/L Na2CO39.0 mmol/L CHES which was found by comparing the determination results of phosphate in samples diluted by redistilled water and eluent respectively. ......
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