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目的:建立用流动注射在线抑制-火焰原子吸收光谱法测定食品中钙含量的检测方法。方法:本文采用微波消解法作为样品前处理方法,选用10 g/L氧化镧溶液作为释放剂,通过微型多功能进样器的双毛细管系统,一路导入释放剂,另一路分别导入钙标准系列、试剂空白、样品消解液,分两路同时连续导入火焰原子化器中,用火焰原子吸收光谱法测定食品中钙含量。结果:钙在0.50μg/ml～20.00μg/ml浓度范围内线性关系良好,相关系数r为0.9998,相对标准偏差RSD为0.93%,加标回收率在96.5%～101.7%,平均回收率为99.1%。结论:该方法具有试剂消耗少,环境污染小,操作简便快速、重现性好、准确度高、线性范围宽等优点,适用于实际样品中钙含量的检测,值得推广应用。
Objective: To establish a method for the determination of calcium in food by flow injection in-line inhibition-flame atomic absorption spectrometry. Methods: In this paper, microwave digestion method was used as a sample pretreatment method, 10 g / L lanthanum oxide solution was selected as a release agent, through a dual capillary system of a micro multi-function injector, all the way into the release agent, the other way into the calcium standard series, Reagent blank, sample digestion solution, divided into two simultaneously and continuously into the flame atomizer, the determination of calcium content in food by flame atomic absorption spectrometry. Results: The linearity of calcium in the range of 0.50μg / ml ~ 20.00μg / ml was good, the correlation coefficient was 0.9998, the relative standard deviation was 0.93%, the recovery was 96.5% ~ 101.7%, the average recovery was 99.1 %. Conclusion: The method has the advantages of less reagent consumption, less environmental pollution, simple and quick operation, good reproducibility, high accuracy and wide linear range. It is suitable for the detection of calcium in real samples and is worth popularizing and applying.