微量进样火焰原子吸收法测定植物油中镁和钙

Determination of Mg and Ca in vegetable oils by flame atomic absorption spectrometry using micro amount injection technique

采用干灰化法处理豆油、棉籽油和芝麻油样品（480℃、5h）时，将常规火焰原子吸收进样方式改成微量注射进样，测定了油中镁、钙含量。每次进样20μL，测镁特征浓度为8．19ng／g，检出限为0．015μg／g，相对标准偏差为2．6％；测钙特征浓度为0．11ng／g，检出限为0．067μg／g，相对标准偏差为3．1％。三种植物油中镁含量分别为20．54、23．92和20．75μg／g，钙含量分别为4．72、2．33和3．00μg／g。

Micro amount injection technique for the determination of Mg and Ca in soyabean, cotton seed and sesame oils by FAAS is described . The micro amount injector is and adapted conventional FAAS sample introduction device. The sample volume of each measurement is 20μL. The characteristic concentration , lower detection limit and RSD for Mg are 8.19ng/g , 0.015μg/g, 2 .6%,respectively, for Ca 0. 11ng/g, 0.067μg/g, 3. 1 %, respectively. The concentrations of Mg in soyabean, cotton seed and sesame oils are 20.54, 23.92 and 20.75μg/g, respectively, that of Ca 4.72, 2.33 and 3.00μg/g, respectively