目的通过分析原子荧光光谱法测定PTC-T087酱油中总砷过程中不确定度的主要来源,对其测定结果的不确定度进行评定,获得实验室原子荧光光谱法测定食品中总砷的不确定度结果,为建立有效的质量控制方法提供依据。方法采用GB/T 5009.11-2003《食品中总砷及无机砷的测定》第1法氢化物原子荧光光度法对PTC-T087酱油中的总砷进行测定,同时构建数学模型,对各部分分量进行分析,并据此对测定结果的不确定度进行评定。结果 PTC-T087酱油中总砷检测结果为(0.96±0.04)mg/L(k=2),当检测结果为0.96 mg/L时,方法的扩展不确定度为0.04 mg/L。结论校准曲线产生的不确定度是扩展不确定度的主要来源,故在测定过程中可以通过控制标准曲线引入的不确定度来减小测量值的扩展不确定度。 OBJECTIVE To evaluate the uncertainty of the determination of total arsenic in the soymilk of PTC-T087 by atomic fluorescence spectrometry, and to evaluate the uncertainty of the determination results. The determination of total arsenic in food by laboratory atomic fluorescence spectrometry Degree of results, to provide an effective basis for quality control methods. Methods Determination of total arsenic in PTC-T087 soy sauce by GB / T 5009.11-2003 “Determination of total arsenic and inorganic arsenic in food” by the first method of hydride generation atomic fluorescence spectrometry. At the same time, a mathematical model was constructed, Analysis, and to assess the uncertainty of the measurement results accordingly. Results The total arsenic concentration in PTC-T087 soy sauce was (0.96 ± 0.04) mg / L (k = 2). When the test result was 0.96 mg / L, the extended uncertainty of the method was 0.04 mg / L. Conclusion The uncertainty caused by the calibration curve is the main source of the extended uncertainty. Therefore, the uncertainty of the measurement can be reduced by controlling the uncertainty introduced by the standard curve during the measurement.