Department of Analytical Chemistry, Faculty of Sciences, University of Malaga, Campus of Teatinos, 29071 Málaga, Spain.
Department of Analytical Chemistry, Faculty of Sciences, University of Malaga, Campus of Teatinos, 29071 Málaga, Spain.
Talanta. 2018 Mar 1;179:1-8. doi: 10.1016/j.talanta.2017.10.033. Epub 2017 Oct 27.
A green and simple method has been proposed in this work for the simultaneous determination of V, Ni and Fe in fuel ash samples by solid sampling high resolution continuum source graphite furnace atomic absorption spectrometry (SS HR CS GFAAS). The application of fast programs in combination with direct solid sampling allows eliminating pretreatment steps, involving minimal manipulation of sample. Iridium treated platforms were applied throughout the present study, enabling the use of aqueous standards for calibration. Correlation coefficients for the calibration curves were typically better than 0.9931. The concentrations found in the fuel ash samples analysed ranged from 0.66% to 4.2% for V, 0.23-0.7% for Ni and 0.10-0.60% for Fe. Precision (%RSD) were 5.2%, 10.0% and 9.8% for V, Ni and Fe, respectively, obtained as the average of the %RSD of six replicates of each fuel ash sample. The optimum conditions established were applied to the determination of the target analytes in fuel ash samples. In order to test the accuracy and applicability of the proposed method in the analysis of samples, five ash samples from the combustion of fuel in power stations, were analysed. The method accuracy was evaluated by comparing the results obtained using the proposed method with the results obtained by ICP OES previous acid digestion. The results showed good agreement between them. The goal of this work has been to develop a fast and simple methodology that permits the use of aqueous standards for straightforward calibration and the simultaneous determination of V, Ni and Fe in fuel ash samples by direct SS HR CS GFAAS.
本工作提出了一种绿色、简便的方法，采用固体进样高分辨连续光源石墨炉原子吸收光谱法（SS-HR-CS-GFAAS）直接对燃料灰分样品进行固体进样，同时测定其中的 V、Ni 和 Fe。快速程序的应用与直接固体进样相结合，可以避免涉及样品最小操作的预处理步骤。本研究中应用了铱处理平台，从而可以使用水溶液标准品进行校准。校准曲线的相关系数通常优于 0.9931。分析的燃料灰分样品中 V 的浓度范围为 0.66%-4.2%，Ni 的浓度范围为 0.23%-0.7%，Fe 的浓度范围为 0.10%-0.60%。V、Ni 和 Fe 的精密度（%RSD）分别为 5.2%、10.0%和 9.8%，为每个燃料灰分样品 6 个重复的%RSD 的平均值。所建立的最佳条件用于测定燃料灰分样品中的目标分析物。为了测试所提出方法在样品分析中的准确性和适用性，对来自电站燃料燃烧的五个灰分样品进行了分析。通过将所提出方法获得的结果与先前进行酸消解的 ICP-OES 获得的结果进行比较，评估了方法的准确性。结果表明它们之间具有良好的一致性。本工作的目的是开发一种快速简便的方法，该方法允许使用水溶液标准品进行直接校准，并通过直接 SS-HR-CS-GFAAS 同时测定燃料灰分样品中的 V、Ni 和 Fe。
