Objective To develop an uncertainty evaluation method of vanillin in milk powder by gas chromatography-mass spectrometry (GC-MS). Methods The mathematical model of uncertainty evaluation was established after the sources of uncertainty were systematically analyzed. Through calculating the each uncertainty during analysis process, the combined and expanded uncertainties were obtained. Results When the measurement result of vanillin was 57.1 mg/kg, the expanded uncertainty was 4.4 mg/kg, k=2. Conclusion The main sources of uncertainty were caused by the recovery for samples and the establishment of standard curve with the least squares. It provides a reference basis for uncertainty evaluation of vanillin in milk powder.
标题：气相色谱-质谱法测定奶粉中香兰素的不确定度评估
英文标题：Evaluation of uncertainty in determination of vanillin in milk powder by gas chromatography-mass spectrometry
