石墨炉原子吸收法测定罐头食品中的锡

以密闭消解样品，石墨炉原子吸收法测定食品中微量锡。对影响测定灵敏度的条件进行优化，以氯化钯＋硝酸镁为基体改进剂，在灰化温度1000℃，原子化温度1800℃条件下，方法检出限为6.7μg/L，线性范围0.05～0.20mg/L，回收率99.2%～104.4%，相对标准偏差4.3%。本方法具有检出限低、灵敏度高、简便、准确等优点，可满足食品中准确测定较低含量锡的要求。

Graphite Furnace Atomic Absorption Spectrometric Determination of Tin in Foods

A graphite furnace atomic absorption spectrometry (GFAAS) method was established to determine the amount of tin in foods under the condition of closed vessel digestion. Samples were subjected to determination at ashing temperature of 1000 ℃ and atomization temperature of 1800 ℃ using PdCl2 and Mg(NO3)2 as the matrix modifiers. Under the optimal determination conditions, an excellent linear relationship was observed in the concentration range of 0.05－0.20 mg/L. The detection limit, recovery rate and accuracy of this developed method were 6.7μg/L, 99.2%－104.4% and 4.3%, respectively. Therefore, this developed method is characteristics of simple operation, high accuracy and excellent sensitivity so that it can meet the requirement for the determination of tin in foods with low concentration.