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目的建立氟试剂分光光度法测定生活饮用水中氟化物的的不确定度评定方法,从而找出测定过程中的关键环节及主要影响因素,为有效地提高检测工作的质量提供依据。方法建立数学模型,应用测量不确定度评定方法[1],分析测定过程中不确定度的来源,计算各不确定分量,合成和扩展不确定度。结果不确定度的主要来源为工作曲线拟合引入的不确定度、标准溶液配制过程引入的不确定度以及样品重复测定引入的不确定度。生活饮用水中氟化物浓度测定值为1.03 mg/L,计算其扩展不确定度为0.018 mg/L。结论控制测定过程中的关键环节及主要影响因素,可有效降低测定过程中引入的测量不确定度,从而保证了测定结果的准确可靠。
OBJECTIVE To establish a method for the spectrophotometric determination of fluoride in drinking water by fluorometric method, and to find out the key links in the determination process and the main influencing factors, so as to provide a basis for effectively improving the quality of testing. Methods A mathematical model was established. The method of measurement uncertainty was applied [1]. The sources of uncertainty in the measurement were analyzed. The uncertain components were calculated and the uncertainties were synthesized and expanded. The main sources of the resulting uncertainty are the uncertainty introduced by the working curve fit, the uncertainty introduced by the standard solution formulation, and the uncertainty introduced by the repeated sample determination. The measured fluoride concentration in drinking water was 1.03 mg / L, and the expanded uncertainty was calculated as 0.018 mg / L. Conclusion The key links in the control measurement process and the main influencing factors can effectively reduce the measurement uncertainty introduced in the measurement process, thus ensuring the accuracy and reliability of the measurement results.