Interlaboratory trial on the determination of selenium in lyophilized human serum, blood and urine using hydride generation atomic absorption spectrometry

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Abstract
An interlaboratory collaborative study was conducted on the determination of total selenium (Se) with hydride generation atomic absorption spectrometry. Six different materials were investigated, four lyophilized body fluids, an acid-digested body fluid and an acidified aqueous reference solution. The main objective was to find out if accurate values for Se can be obtained with hydride generation atomic absorption spectrometry when an appropriate sample decomposition technique is used. The proposed procedure included a decomposition with nitric, sulphuric and perchloric acids to a final temperature of 310.degree. C in special flasks with long necks. The results obtained by 9 laboratories using the proposed decomposition procedure and 4 laboratories using slight modifications of it show excellent agreement with the values established in previous interlaboratory trials or by experienced laboratories using a number of independent techniques.