氢化物原子荧光法测定五种粮食中总砷含量的不确定度评定

Evaluation of Uncertainty in the Determination of Total Arsenic Content in Five Kinds of Grain by Hydride Atomic Fluorescence Spectrometry

评定氢化物原子荧光法测定5种粮食中总砷含量的不确定度,发现在95%的置信区间下,高粱、大米、糯米、小麦和玉米中总砷含量分别为(0.0283±0.0020)mg·kg^(-1)、(0.1139±0.0045)mg·kg^(-1)、(0.0878±0.0030)mg·kg^(-1)、(0.0147±0.0016)mg·kg^(-1)、(0.0409±0.0020)mg·kg^(-1),其不确定度主要来自标准曲线拟合、标准溶液稀释和测量重复性。

To evaluate the uncertainty of determination of total arsenic content in 5 kinds of grain by hydride atomic fluorescence method.Found that with a 95%confidence interval,the total arsenic content in sorghum,rice,glutinous rice,wheat and corn was(0.0283±0.0020)mg·kg^(-1),(0.1139±0.0045)mg·kg^(-1),(0.0878±0.0030)mg·kg^(-1),(0.0147±0.0016)mg·kg^(-1) and(0.0409±0.0020)mg·kg^(-1),whose uncertainty mainly comes from standard curve fitting,standard solution dilution,and measurement repeatability.