X射线荧光光谱法快速检测谷物碾磨加工品中的5种重金属

Rapid determination of 5 kinds of heavy metals in grain milling products by X-ray fluorescence spectroscopy

中文关键词:  X-射线荧光光谱  重金属  谷物碾磨加工品  快速检测

英文关键词:X-ray fluorescence spectrometry  heavy metals  grain milling products  rapid detection

中文摘要:

      目的 建立X射线荧光光谱法快速检测谷物碾磨加工品中铅、总砷、镉、铬、总汞含量的方法。方法 选择谷物碾磨加工品中小麦粉典型基质, 制备成含有一定量5种重金属标准样品, 利用标准样品建立基质标准曲线, 外标法定量, 实现对实际样品的检测。结果 5种重金属在一定的线性范围内均呈良好的线性关系, 线性相关系数(r2)均大于0.99; 方法中铅、总砷、镉定量限为0.10 mg/kg, 铬定量限为0.50 mg/kg, 总汞定量限为0.05 mg/kg; 方法精密度、重复性、稳定性能够满足快检需求; 5种重金属在0.2、0.4与1.5 mg/kg 3个浓度水平的加标回收率为81.4%~95.4%; 对X射线荧光光谱法与国家标准检测结果进行比较, 相对误差小于15%。结论 本研究建立的方法简便、快捷、准确性高, 适宜对谷物碾磨加工品中5种重金属进行快速检测。

英文摘要:

      Objective To establish a rapid method for determination the content of lead, total arsenic, cadmium, chromium and total mercury in grain milling products by X-ray fluorescence spectrometry. Methods The typical matrix of wheat flour in grain milling products was selected to prepare the standard sample containing a certain amount of 5 heavy metals. The standard curve of matrix was established by using the standard sample, and the quantitative method was used to detect the actual sample. Results All the 5 kinds of heavy metals showed good linear relationship within a certain linear range, and the linear correlation coefficient (r2) was greater than 0.99. The limits of quantification for lead, total arsenic and cadmium were 0.10 mg/kg, the limit of quantification for chromium was 0.50 mg/kg, and the limit of quantification for total mercury was 0.05 mg/kg. The precision, repeatability and stability of the method could meet the requirements of fast inspection. The recoveries of 5 kinds of heavy metals at three concentration levels of 0.2, 0.4 and 1.5 mg/kg were 81.4%-95.4%. The relative error of X-ray fluorescence spectrometry was less than 15% compared with that of national standard. Conclusion The method established in this study is simple, fast and accurate, and is suitable for the rapid detection of 5 kinds of heavy metals in grain milling products.