[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.