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目的:对离子选择电极法测定饮用水中氟化物的实验室常规质量控制和实验室间分析质量控制程序。方法:按照生活饮用水标准检验方法(GB/T5750.5)中氟离子选择电极法测定。结果:对数回归方程为y=Log-1(228.5-E/55.4),常规质控图的总平均回收率为99.2 mg/L,上控制限为105.9%,下控制限为92.5%,本实验室标准溶液与统一发放的标准溶液之间比较的差值为2.26(<5%)。结论:通过实施实验室常规质量控制和实验室间的标准溶液比较试,方法在一定条件下测定水氟的误差可控制在允许的置信水平内。
OBJECTIVE: To control routine quality control and laboratory quality control procedures of fluoride in drinking water by ion selective electrode method. Methods: According to the standard test method for drinking water (GB / T5750.5) fluoride ion selective electrode method. Results: The logarithmic regression equation was y = Log-1 (228.5-E / 55.4). The average recovery of the conventional QC was 99.2 mg / L, the upper control limit was 105.9% and the lower control limit was 92.5% A difference of 2.26 (<5%) between the standard laboratory solution and the standard solution that was uniformly dispensed. CONCLUSIONS: By carrying out routine quality control in laboratories and comparing standard solutions between laboratories, the method can be used to control the error of water fluorine under certain conditions within the allowable confidence level.