电感耦合等离子体质谱法测定离子膜烧碱用盐中微量碘

Determination of Iodine in Salt for Ion-exchange Membrane Caustic Soda by Inductively Coupled Plasma Mass Spectrometry

文章对电感耦合等离子体质谱法测定离子膜烧碱用盐中微量碘的测定方法进行了研究。文中选择四甲基氢氧化铵作为实验介质进样,利用碲作为内标元素消除氯化钠基体干扰,确立了适合的实验方法。方法检出限为0.058 mg/kg,精密度RSD≤5.1%,平均回收率104.2%。方法结果准确,检出限低,适合离子膜烧碱用盐中微量碘的测定。

It was carried out the determination of iodine in Salt for ion - exchange membrane caustic soda by Inductively Coupled Plasma Mass spectrometry. Sample was diluted by Tetrametliyl- ammonium hydroxide and introduced directly into ICP - MS to determine iodine. Te was used as on -line internal standard. A new metliod of inductively coupled plasma mass spectrometry for tlie de-termination of iodine in salt for ion - exchange membrane caustic soda was studied. The detectionlimit was 0. 058 mg/kg, was better than 5. 1% and the average recovery was 104. 2% . This method is accurate, stable, low detecting limit and extremely suitable for the determination of iodine in salt for ion - exchange membrane caustic soda.