火焰原子吸收法测定氧化铝中的钠

Determination of Sodium in Aluminium Oxide by Flame Atomic Absorption Spectrophotometry

提出了用火焰原子吸收法测定氧化铝中钠的方法。样品在铂坩埚中用Ｌｉ２ＣＯ３－Ｈ３ＢＯ３于１０００℃下熔融２０ ｍ ｉｎ，后加硝酸（１＋ １） 使熔融物完全溶解；在硝酸介质中，加入铯盐作为消电离剂，可消除基体及其它共存元素的干扰。可测定Ａｌ２Ｏ３中质量分数为０．０１％ ～１．５０％ 范围内的Ｎａ２Ｏ，相对标准偏差＜３％ （ｎ＝ １１），加标回收率为９８％ ～１０２％ 。

The method of determining sodium in Al 2O 3 by flame atomic absorption spectrophotometry was proposed.The sample was fused for 20 min with Li 2CO 3 H 3BO 3 in platinum crucible at 1000℃,and the melt was dissolved with HNO 3(1+1) and H 2O.Using cesium salt as deionizer,the interferences from the matrix and other coexistence elements can were eliminated in HNO 3 medium.Hence,matrix matched standards were not requied.The method was simple、accurate ,and Na 2O in the 0.05%～1.20% in Al 2O 3 can were determined ,RSD were less than 3%( n =11),and recoveries of adding standard were between 98%～102%