电感耦合等离子体质谱法测定有机肥中铅含量的不确定度评定

Uncertainty evaluation of determination of lead in organic fertilizer by inductively coupled plasma mass spectrometry

目的评定电感耦合等离子体质谱法测定有机肥中铅含量的不确定度。方法分析采用电感耦合等离子体质谱法测定有机肥中的铅含量中的影响因素,包括测定精密度、前处理、标准溶液的配制、标准曲线拟合等,计算各不确定度分量及扩展不确定度。结果在置信区间为95%的范围内,当有机肥样品所测铅浓度为0.782 mg/L时,最终计算扩展不确定度为0.0172 mg/L(k=2)。结论本方法适用于电感耦合等离子体质谱仪法测定有机肥中铅浓度的不确定度评定。

Objective To evaluate the uncertainty of determination of lead in organic fertilizer by inductively coupled plasma mass spectrometry.Methods The factors affecting the determination of lead content in organic fertilizers by inductively coupled plasma mass spectrometry were analyzed,including determination precision,pretreatment,preparation of standard solution,standard curve fitting,etc.The results of the uncertainty and the expanded uncertainty were calculated.Results Under the 95% confidence interval,When the lead concentration of organic fertilizer sample was 0.782 mg/L,the final calculated expanded uncertainty was 0.0172 mg/L(k=2).Conclusion This method is suitable for the uncertainty evaluation of the determination of lead in organic fertilizers by inductively coupled plasma mass spectrometry.