摘要
目的对气相质谱法测定黄芪中二嗪磷残留量的不确定度进行评价。方法建立标准工作曲线和样品定量测定的数学模型,对实验过程中各影响因素进行评价。结果主要从标准曲线的变动性、测定结果的重复性、二嗪磷的浸出率以及内标物取样量4个方面进行量化,并计算出合成不确定度为0.016 mg/kg,取k=2的扩展不确定度为0.032 mg/kg,黄芪中二嗪磷残留量为(0.091±0.032)mg/kg。结论标准曲线的变动性是影响结果不确定度的主要因素,使用更高响应的检测方法,可有效提高标准曲线的线性,减少此类测量的不确定度。
Objective To evaluate the uncertainty for diazinon residues in Astragail radix by gas chromatography-mass spectrometry. Methods The models for evaluation of the uncertainty about both standard work curve and sample quantitative testing were established, and the factors that influenced the measurement were investigated. ResultsThe four main factors were quantized including mobility of standard curve, repetitiveness of testing results extract efficiency of diazinon in Astragali radix, and the volume of internal standard solution. The combined standard uncertainty was obtained as 0.016 mg/kg, the expanded uncertainty was 0.032 mg/kg when k=2, then diazinon residues in Astragali radix was determined as (0.091±0.032) mg/kg. ConclusionMobility of standard curvewas the primary factor for the measurement of uncertainty. The uncertainty may be reduced and the linearity of standard curve may be increased by using the higher responsive detector.
出处
《食品安全质量检测学报》
CAS
2015年第5期1743-1747,共5页
Journal of Food Safety and Quality
关键词
气相质谱法
黄芪
二嗪磷
不确定度
gas chromatography-mass spectrometry
Astragali radix
diazinon
uncertainty
