Francisco Barbara Bruna A, Brum Daniel M, Cassella Ricardo J
Departmento de Química Analítica, Universidade Federal Fluminense, Outeiro de Sao João Batista s/n, Centro, Niterói, RJ 24020-141, Brazil.
Departmento de Química Analítica, Universidade Federal Fluminense, Outeiro de Sao João Batista s/n, Centro, Niterói, RJ 24020-141, Brazil.
Food Chem. 2015 Oct 15;185:488-94. doi: 10.1016/j.foodchem.2015.04.020. Epub 2015 Apr 14.
The present work proposes a method for the direct determination of Al, Cu, Cr, Fe and Ni in Brazilian carbonated soft drinks by electrothermal atomic absorption spectrometry (ETAAS). Samples of different flavors packed in containers made of different materials (polyterephthalate ethylene and glass bottles, and aluminum and steel cans) were analyzed. The method was optimized by building up pyrolysis and atomization curves in sample medium and by evaluating the calibration approach. Under optimized conditions, recoveries in the range of 92-104% were obtained in the evaluation of method accuracy. The limits of quantification for Al, Cu, Cr, Fe and Ni were 2.3, 0.93, 0.17, 0.90 and 1.2 μg L(-1), respectively. Also, the impact of the material used in the packaging and flavor on the concentrations of each metal in the samples was evaluated. It was proved that neither flavor nor packaging material affected the concentrations of Al and Fe in the samples. On the other hand, the packaging material influenced the concentration of Cu, Cr and Ni, and only the flavor affected the concentration of Cu in the samples. These conclusions were based on the data obtained from the application of a two-way ANOVA evaluation at 95% confidence level.
本研究提出了一种用电热原子吸收光谱法（ETAAS）直接测定巴西碳酸软饮料中铝、铜、铬、铁和镍的方法。对包装在不同材料（聚对苯二甲酸乙二酯和玻璃瓶，以及铝罐和铁罐）容器中的不同口味样品进行了分析。通过在样品介质中建立热解曲线和原子化曲线以及评估校准方法对该方法进行了优化。在优化条件下，评估方法准确性时回收率在92%-104%范围内。铝、铜、铬、铁和镍的定量限分别为2.3、0.93、0.17、0.90和1.2 μg L⁻¹。此外，还评估了包装材料和口味对样品中每种金属浓度的影响。结果表明，口味和包装材料均不影响样品中铝和铁的浓度。另一方面，包装材料影响铜、铬和镍的浓度，只有口味影响样品中铜的浓度。这些结论基于在95%置信水平下应用双向方差分析获得的数据。
