Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, 31270-901 Belo Horizonte, MG, Brazil.
Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, 31270-901 Belo Horizonte, MG, Brazil.
Talanta. 2015 Jun 1;138:8-14. doi: 10.1016/j.talanta.2015.02.006. Epub 2015 Feb 11.
A measurement procedure for direct and simultaneous quantification of Na, K and Ca in biodiesel by flame atomic emission spectroscopy (FAES) was developed. A lab-made device was constructed by coupling a nebulizer/combustion system from a commercial photometer to a continuous emission detector in a spectral range of 255 to 862 nm. Instrumental optimizations were carried out evaluating the most important variables, such as gas flow rates and sample introduction temperature, indicating that a temperature of 50°C enhances the analytical signals and assures good precision. The direct analysis method was properly validated and presented limits of quantification of 0.09, 0.07 and 0.43 μg kg(-1) for Na, K and Ca, respectively. Accuracy of the proposed procedure was checked by comparing the results with those obtained by the standard procedure described in ABNT NBR 15556 and the standard addition method.
建立了一种通过火焰原子发射光谱法（FAES）直接同时定量测定生物柴油中 Na、K 和 Ca 的测量程序。通过将商用光度计的雾化/燃烧系统与连续发射检测器在 255 至 862nm 的光谱范围内耦合，构建了一个实验室制造的装置。通过评估最重要的变量，如气体流速和样品引入温度，进行了仪器优化，表明 50°C 的温度可以增强分析信号并确保良好的精密度。直接分析方法得到了适当的验证，分别为 Na、K 和 Ca 规定了 0.09、0.07 和 0.43μgkg-1 的定量限。通过将结果与 ABNT NBR 15556 中描述的标准程序和标准添加法获得的结果进行比较，检查了所提出程序的准确性。
