原子吸收法直接测定食用L-赖氨酸盐酸盐中的铜和铅

Direct Determination of Cu and Pb in Edible L-lysine by Graphite Furnace Atomic Absorption Spectrometry

本文报道了用石墨炉 原子吸收分析法 ,将食用L 赖氨酸盐酸盐样品经稀酸溶解后 ,直接进样测定。该方法省去了通常必需的干灰化或湿消解过程 ,充分利用石墨炉本身所具有的对样品进行部分预处理的功能 ,在无基体改进剂的条件下 ,快速测定样品中的Cu和Pb的含量。方法简便、快速、准确、实用。Cu和Pb的精密度试验的相对标准偏差分别为 4 8%和 5 3% ;回收率分别为 10 0 %～ 110 %和 10 2 %～ 10 5 %。

The determination of Cu and Pb in edible L-lysine by rapid graphite furnace atomic absorption spectrometry (GFAAS) is described in this paper. The sample is dissolved with thin acid and mensurated directly by GFAAS. It does not need dry ashing and wet digesting and without chemical matrix modifier. The Graphite Furnace's function of pro-treatment is fully used. Results can be obtained as soon as possible and avoid unnecessary contamination and loss of samples. The method is simple, rapid, practical and have good precision and accurate. Under the optimum conditions the result indicates that the relative standard deviation of Cu and Pb is 4.8% and 5.3% respectively, the recovery rate is 100%-110% and 102%-105% separately.