Simultaneous determination of cadmium, iron and tin in canned foods using high-resolution continuum source graphite furnace atomic absorption spectrometry
Simultaneous determination of cadmium, iron and tin in canned foods using high-resolution continuum source graphite furnace atomic absorption spectrometry
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DOI：
10.1016/j.talanta.2016.02.023
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发表时间：
2016-06-01
期刊：
影响因子：
6.1
通讯作者：
Ferreira, Sergio L. C.
中科院分区：
文献类型：
--
作者：
Leao, Danilo J.;Junior, Mario M. S.;Ferreira, Sergio L. C.
建立了高分辨连续源石墨炉原子吸收光谱法同时测定罐头食品中镉、铁和锡的方法。分别使用镉的主谱线（228.802 nm）和铁和锡的相邻副谱线（228.725 nm和228.668 nm）进行定量步骤。所选择的化学改性剂是含有0.1%（w/v）Pd和0.05%（w/v）Mg的混合物的酸溶液。基于峰面积，使用镉的3个像素和铁和锡的5个像素测量吸光度信号。在此条件下，采用基于水溶液标准的外校准技术测定了罐头食品样品中的镉、铁和锡，其定量限分别为2.10 ng g（-1）、1.95 mg kg（-1）和3.00 mg kg（-1），镉的特征质量为1.0 pg，铁为0.9 ng，锡为1.1 ng。使用每种金属离子的两种溶液评价精密度，结果表示为相对标准偏差（RSD%），为3.4- 6.8%。通过分析由NIST提供的苹果叶标准物质（NIST 1515），确认了镉和铁的方法准确度。然而，对于锡，通过比较拟定方法和另一种分析技术（电感耦合等离子体发射光谱法）的结果确认了准确度。将该方法应用于去皮番茄和沙丁鱼罐头样品中镉、铁和锡的测定。分析了11个样品，镉、铁和锡的分析物浓度分别为3.57-62.9 ng g（-1）、2.68-31.48 mg kg（-1）和4.06-122.0 mg kg（-1）。在所有分析的样品中，镉和锡的含量低于巴西法律规定的罐头食品中这些金属的最高允许含量。(C)2016由Elsevier B. V.出版
A method was established to simultaneously determine cadmium, iron and tin in canned-food samples using high-resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS GF AAS). The quantification step has been performed using the primary line (228.802 nm) for cadmium and the adjacent secondary lines (228.725 nm and 228.668 nm) for iron and tin, respectively. The selected chemical modifier was an acid solution that contained a mixture of 0.1% (w/v) Pd and 0.05% (w/v) Mg. The absorbance signals were measured based on the peak area using 3 pixels for cadmium and 5 pixels for iron and tin. Under these conditions, cadmium, iron and tin have been determined in canned-food samples using the external calibration technique based on aqueous standards, where the limits of quantification were 2.10 ng g(-1) for cadmium, 1.95 mg kg(-1) for iron and 3.00 mg kg(-1) for tin, and the characteristic masses were 1.0 pg for cadmium, 0.9 ng for iron and 1.1 ng for tin. The precision was evaluated using two solutions of each metal ion, and the results, which were expressed as the relative standard deviation (RSD%), were 3.4-6.8%. The method accuracy for cadmium and iron was confirmed by analyzing a certified reference material of apple leaves (NIST 1515), which was supplied by NIST. However, for tin, the accuracy was confirmed by comparing the results of the proposed method and another analytical technique (inductively coupled plasma optical emission spectrometry). The proposed procedure was applied to determine cadmium, iron and tin in canned samples of peeled tomato and sardine. Eleven samples were analyzed, and the analyte concentrations were 3.57-62.9 ng g(-1), 2.68-31.48 mg kg(-1) and 4.06-122.0 mg kg(-1) for cadmium, iron and tin, respectively. In all analyzed samples, the cadmium and tin contents were lower than the permissible maximum levels for these metals in canned foods in the Brazilian legislation. (C) 2016 Published by Elsevier B.V.