电感耦合等离子体质谱法检测红薯粉条中铝和钛含量的不确定度评定

目的评定电感耦合等离子体质谱法(inductively coupled plasma mass spectrometry,ICP-MS)检测红薯粉条中铝和钛含量的不确定度。方法采用ICP-MS法测定红薯粉中铝和钛的含量,系统分析其不确定的来源,量化不确定度分量,计算扩展不确定度。结果经评定,红薯粉中铝的含量为(3.079±0.50) mg/kg,钛的含量为(0.566±0.022) mg/kg。影响铝和钛测定不确定度的主要因素是样品中铝和钛浓度测定时的标准溶液稀释过程,其次是重复性试验和回收试验,样品称量和溶液定容可忽略不计。结论本方法客观可靠,有望为ICP-MS法检测其他食品中铝和钛含量的不确定度评定提供借鉴和参考。

Uncertainty evaluation for determination of aluminium and titanium content in sweet potato vermicelli by inductively coupled plasma mass spectrometry

Objective To evaluate the uncertainty for determination of aluminium (Al) and titanium (Ti) in sweet potato vermicelli by inductively coupled plasma mass spectrometry (ICP-MS). Methods The content of Al and Ti in sweet potato vermicelli was determined by ICP-MS firstly. Then the extended uncertainty was calculated by systematically analysing the sources of uncertainty and quantifying the uncertainty components. Results The content of aluminum in sweet potato powder was (3.079±0.50) mg/kg, and the content of titanium was (0.566±0.022) mg/kg. The main sources of uncertainty for the determination of Al and Ti by ICP-MS were dilution of standard solutions, followed by the repeatability and the recovery tests. The influences of weigh and constant volume of samples were negligible. Conclusion This method is objective and reliable, which will provide valuable technical supporting for the uncertainty evaluation of determination of Al and Ti in various foodstuffs by ICP-MS.