等速电泳法同时检测无机和有机阴离子

The Slmultaneous Analysis of Inorganic and Organic Anions by Isotachophoresis

本文介绍了利用自制的ＯＣＥＰ－１型离子分析仪，建立了以Ｃｌ－为前导，正丁酸很为尾随，８－羟基喹啉为缓冲配对离子的等速电泳分离系统的新分离分析方法，对ＮＯ＿３，ＮＯ＿２，Ｆ￣－，ＨＣＯＯ￣－及ＣＨ３ＣＯＯ￣－进行分离和同时检测，获得满意的结果。

he nitrate,nitrite,fluoride, formate and acetate ions were separated and determined by isota-chophoresis according to their differences in effective mobilities caused by different pKa,Oxine was used as aco-counter cation to form a buffered solution at pH 4.0 in the leading electrolyte,0. 005mol/L hydrochloricacid.The teriminating electrolyte is a solution containing 0. 0lmol/L n-butyric acid and 0.005mol/L oxine atpH 4.5.The detection limit at 5 × 10￣(-5)mol/L with a sample volume of5.30μL was less than l8ng。 Thelinearity existed in 5 × 10￣(-5)～2 × 10￣(-3)mol/L,The reproducibility was good with a CV between l.1%and5.5%。 The recoveries were from 95 to l08%。