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本文介绍一个准确、精密和快速的方法用于测定含硒酵母及硒营养补充剂中的硒。在用非火焰原子吸收测定之前将试样悬浮于混合非离子型表面活性剂的酸化乳剂中,用镍作基体改进剂以防止硒在原子化前挥发。本文指出了使用热解涂层石墨管的优点,此方法的平均回收率为101.6％,相对标准偏差为4.3％。可适用于范围从10微克/单位到50微克/单位硒营养补充剂的分析。本方法特别适用于合类脂量高的试样(大于30％类脂)。分析了10种商业的硒补充剂和7种硒酵母。
This article presents an accurate, precise and rapid method for the determination of selenium in selenium-containing yeast and selenium nutritional supplements. Samples were suspended in an acidified emulsion of a mixed non-ionic surfactant prior to non-flame atomic absorption measurements using nickel as a matrix modifier to prevent selenium volatilization prior to atomization. This article points out the advantages of using a pyrolytic coated graphite tube with an average recovery of 101.6% and a relative standard deviation of 4.3%. It is suitable for analysis of selenium nutritional supplements ranging from 10 μg / unit to 50 μg / unit. This method is particularly suitable for high fat samples (more than 30% lipid). Ten commercial selenium supplements and seven selenium yeast were analyzed.