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目的通过对能力验证实验中三氯甲烷测定的不确定度评定,找出影响检测结果准确性的主要因素,从关键环节加以控制,减少测定过程中的人为和随机误差,确保检测结果准确。方法按国标方法进行测定,建立数学模型,确定不确定度来源并计算各分量,得出合成不确定度,最后形成不确定度报告。结果取k=2(置信概率95%),扩展不确定度为4.8μg/L,结果为(75.7±4.8)μg/L,本次能力验证结果满意(z=1.63,z≤2为满意结果)。结论对本次测定不确定度贡献较大的是标准溶液配制、工作曲线拟合和重复测定这几方面,所以应重点从这几方面加以控制,确保检测结果的准确性。
OBJECTIVE Through the assessment of the uncertainty of determination of chloroform in the proficiency testing, the main factors influencing the accuracy of the test results are found, and the key factors are controlled to reduce the man-made and random errors in the determination process and ensure the accuracy of the test results. Methods According to the national standard method, the mathematical model was established, the sources of the uncertainty were determined, and the components were calculated to obtain the synthetic uncertainty, and finally the report of the uncertainty was formed. Results k = 2 (confidence probability 95%), extended uncertainty of 4.8μg / L, the result was (75.7 ± 4.8) μg / L, the results of this proficiency test were satisfactory (z = 1.63, ). Conclusions The most important contribution to the determination of this measurement is standard solution preparation, working curve fitting and repeated measurement of these aspects, it should focus on these aspects to be controlled to ensure the accuracy of test results.