不完全消化-微乳液进样-FAAS法测定3 种休闲食品中Fe

建立不完全消化-微乳液进样-高分辨-火焰原子吸收光谱法测定休闲食品（鸡味块、方便面、薯条）中Fe的方法。以不完全消化作为样品的前处理方式，正丁醇作为助乳化剂，研究微乳液的形成条件，分析乙炔流量、燃烧器高度、KCl的质量浓度对吸光度的影响。在单因素试验的基础上，通过正交试验确定最佳测定条件为乙炔流量60 L/h、燃烧器高度4 mm、KCl质量浓度1.5 g/L。在此条件下，使用本法测定3 种休闲食品中Fe，通过F检验和t检验，表明在0.05显著性水平上本法和国标的精密度和所测得结果的平均值无显著性差异，且本法的加标回收率为92.5%～96.7%。方法快速、准确、稳定，具有较高的实用价值，可为休闲食品中金属元素的检测提供科学依据。

Determination of Iron in Three Leisure Foods by Incomplete Digestion-Microemulsion Sampling-Flame tomic Absorption Spectrometry

A fast and effective method was developed for the determination of Fe in leisure food samples by incomplete
digestion-microemulsion sampling-high resolution continuum source flame atomic absorption spectrophotometry (HRCS
FAAS). Microemulsions were prepared with digestive liquor using n-butyl alcohol as an auxiliary emulsifier after
incomplete digestion treatment. The conditions of microemulsion formation and the effects of the fuel flow, the burner
height and KCl mass concentration on the absorbance were investigated. Single factor experiments were initially carried
out. The appropriate fuel flow, 60 L/h; the optimum burner height, 4 mm; and the suitable KCl mass concentration, 1.5 g/L
were obtained by orthogonal experiment. Under the optimum conditions, Fe contents in three leisure food sample were
determined by the proposed method. F-test and t-test at a significance level of 0.05 indicated that the Fe contents obtained
by the proposed method and the national standard method were not significantly different. The recoveries for spiked samples
were from 92.5% to 96.7%. Therefore, the proposed method was rapid, accurate and stable with a high practical value. It
provided a scientific basis for the determination of metal elements in leisure food samples.