用电热分子吸收光谱法通过氟化钙测定牛奶样品中的氟。
Determination of fluorine in milk samples via calcium-monofluoride by electrothermal molecular absorption spectrometry.
机构信息
Istanbul Technical University, Faculty of Arts and Sciences, Department of Chemistry, 34469 Maslak, Istanbul, Turkey.
出版信息
Food Chem. 2013 May 1;138(1):650-4. doi: 10.1016/j.foodchem.2012.11.008. Epub 2012 Nov 12.
The determination of fluorine in milk samples via the molecular absorption of calcium mono-fluoride (CaF) was performed using a HR-CS-ETAAS. For this purpose, calcium was pipetted to graphite furnace together with samples. The amount of Ca and the graphite furnace program were optimised. Fluorine was determined in pyrolytically coated platforms at 606.440 nm applying a pyrolysis temperature of 700 °C and a molecule forming temperature of 2250 °C. Finally, applying standard addition technique, F contents of several milk samples were determined. The results obtained by linear calibration and standard addition techniques were significantly different which can be attributed to non-spectral interferences in milk due to matrix concomitants. Therefore, in order to tolerate the errors, the F contents of several milk samples were determined applying standard addition technique. However, since the ingredients of milk samples change for different kinds, the F in each sample was determined from its own standard addition curve. The range of F content for the milk samples were 0.027-0.543 μg mL(-1). The limit of detection and characteristic mass of the method were 0.26 and 0.13 ng of F, respectively.
采用高分辨率连续光源原子吸收光谱法（HR-CS-ETAAS），通过氟化钙（CaF）的分子吸收来测定牛奶样品中的氟。为此，将钙与样品一起用移液管加入石墨炉中。优化了钙的量和石墨炉程序。在 606.440nm 处，在 700°C 的热解温度和 2250°C 的分子形成温度下，在热解涂层平台上测定氟。最后，采用标准加入技术，测定了几个牛奶样品中的 F 含量。线性校准和标准加入技术的测定结果有显著差异，这归因于由于基质伴随物，牛奶中存在非光谱干扰。因此，为了容忍误差，采用标准加入技术测定了几个牛奶样品中的 F 含量。然而，由于不同种类的牛奶样品成分不同，因此，从各自的标准加入曲线确定每个样品中的 F 含量。牛奶样品中 F 的含量范围为 0.027-0.543μgmL(-1)。该方法的检出限和特征质量分别为 0.26 和 0.13ngF。
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