原子吸收法连续测定氧化铝中微量钙钠铁锌

本文确定以硼酸－碳酸锂为混合溶剂，在铂坩埚中于１０００℃高温炉熔融氧化铝试样，用盐酸浸取，加释放剂，保护剂和消电离剂，用空气－乙炔火焰原子吸收法连续测定四种元素的氧化物含量。该法多次分析标样含量和准确值之差均小于规定的允差范围，测定样品与ＧＢ６６０９－８６法测定的数据安全吻合，已用于１００多批次进口氧化铝的测定，本法准确，可靠，而且简便，快速，有应用推广价值。

SEQUENTIAL DETERMINATION OF TRACE CALCIUM,SODIUM,IRON AND ZINC IN IMPORT ALUMINA BY FAAS

This article introduces the sequential determination of the four elements by air-acetylene FAAS. The method is based on using H3BO3-Li2CO3 as mixed melting agent, the alumina samples filled in platinum crucibes were melted at 1000 degrees C then extracted by HCl, and added the release agent, the protective agent and the eliminator of ionization, respectively, the four oxides contents were determined sequentially. The standard samples have been analysed many times by this method, the experimental results show that the determination errors are less than the tolerance. The values of test samples detected by present method are in accordance with those of by GB6609-86. This approach has been used for 100 and more lots of import alumina determination. It is not only accurate and reliable, but also easy and rapid. It is worth popularizing.