预浓缩技术-离子色谱法测定过氧化氢中痕量阴离子

Determination of trace anions in hydrogen peroxide by ion chromatography with preconcentration technique

建立了预浓缩-离子色谱法测定过氧化氢中痕量阴离子的方法。通过预浓缩技术去除过氧化氢基体,有效地消除了过氧化氢对分离树脂的氧化破坏作用.色谱条件是:IonPac AS23离子交换柱,等度淋洗,抑制型电导检测.该方法样品中阴离子F-,Cl-,NO3-,SO42-检出限(S/N=3)分别为3.0,5.0,8.0及9.0μg.L-1.该方法具有灵敏度高、选择性好、操作简单、价格便宜等特点.

In this work, a simple method for the simultaneous determination of trace anions in hydrogen peroxide with preconcentration technique was investigated. A pre-concentration column was used for the enrichment of the low concentration of anions in hydrogen peroxide whilst the hydrogen peroxide matrix could be excluded before the separation process to avoid any deterioration on the analytical column. The IC separation was performed on an IonPae AS23 analytical column with isocratic eluent and suppressor conductivity detection. The detection limit （ signal to noise of 3 ： 1） of fluorid, chloride, nitrate and sulfate were 3.0, 5.0, 8.0 and 9.0μg·L^-1 , respectively. High sensitivity, simple operation, low cost and good selectivity are some advantages of the proposed method.