摘要
选用亲水性强、柱容量高的阴离子分析柱IonPacAS18,以22mmol/LKOH为淋洗液作等浓度淋洗,直接进样分析了高浓度磷酸中的痕量无机阴离子。选用柱容量较高的阳离子分析柱IonPacCS12A,H2SO4作为淋洗液直接进样分析了磷酸试剂中的痕量阳离子。该方法无需样品前处理,直接进样,电导检测,高浓度磷酸的存在不影响痕量阴离子或阳离子的测定,对所测的无机阴阳离子的检出限均在2.1μg/L以下,测定范围在两个数量级以上,线性相关系数r在0.9941～0.9999范围内,样品中待测离子峰面积的RSD在3.8%以下(n=7),回收率在91%～109%之间。
A method based on ion chromatography(IC)with conductivity detector was developed for the deterˉmination of residual anions and cations in phosphoric acid.Separation of cations and anions was achieved usˉing IonPac CS12A column with H 2 SO 4 and IonPac AS18column with KOH as isocratic eluent,respectively.The detection was performed at a conductivity detection mode.The calibration graphs of peak areas for all the analytes were linearwithin a large range.The recoveries of added standards were91%-109%.Relative stanˉdard deviations of repeated analyses were smaller than3.8%.Detection limits were lower than2.1μg/L.
出处
《分析测试学报》
CAS
CSCD
北大核心
2005年第3期128-130,共3页
Journal of Instrumental Analysis
基金
国家重点基础研究计划资助项目(2003CB415001)
国家自然科学基金资助项目(20475060)
关键词
离子色谱
磷酸
阴离子
阳离子
Ion chromatography
Phosphoric acid
Anion
Cation
