离子色谱法同时测定三（乙基膦酸）铝原药纯度及各杂质离子的含量

建立了离子色谱抑制电导同时检测三（乙基膦酸）铝原药中主要成分及各杂质离子的方法．采用高容量色谱柱AS9-HC，以9mmol·L^-1的Na2CO。瘩液为流动相．抑制模式为0．02mol·L^-1 H2SO4化学抑制．三（乙基膦酸）铝、Cl^-1、HPO3^2-、SO4^2-、PO4^3-的检出限（S／N=3）分别为15、3、12、6、5μg·L^-1主成分乙基膦酸的保留时间、峰面积、峰高的相对标准偏差分别为0．30％、1．31％、0．13％，其加标回收率为91％．所得结果令人满意，可以用于三（乙基膦酸）铝产品的检测和质量控制．

Determination of phosethyl-Al and the impurities by Ion-exchange chromatography

An ion chromatography method with non-suppressed conductivity detection was developed for simultaneous determination of phosethyl-Al and the impurities in it . High capacity column AS9-HC was chosen, and the eluent was 9mmol· L^-1 Na2CO3. 0.02 mol·L -1 H2SO4 was used as suppressing solution. The limit of detection（S/N=3）of phosethyl Al, chloride, phosphite, sodium, phosphate were 15, 3, 12, 6, 5μg·L^-1, respectively. The relative standard deviations （RSDs） of retention time, peak area and peak height of phosethyl-Al were 0.30%, 1.31% and 0. 13%. The recovery of phosephy-Al was 91%. The result was satisfactory, and the method was proised to he suitable for the determination and quality control of phosethyl-Al product.