离子选择电极法测定水中氟化物质量控制指标研究

摘要

On the basis of a large number of monitoring data from many laboratories nationwidely,we analyzed the quality control index of the fluoride,and compared with the QC index in interrelated references. Studies indicated that the RSD(within-laboratory relative standard deviation) control limit of standard samples was less than 4.0% , RSD' (inter-laboratory relative standard deviation) was less than 8% and the relative error was controded within 10% when the concentration was beteen 0.5 mg/L and 4. 5 mg/L. Relative deviation of actual samples which concentration was between 0. 06 mg/L and 7. 0 mg/L was less than 5% . The correspounding recovery rates can be ranged between 90% and 110% .%通过全国多家实验室的大量监测数据,研究分析了离子选择电极法测定水中氟化物的质量控制指标.研究表明,在0.5～4.5 mg/L范围内同一标准样品多次测定的质量控制指标为:室内相对标准偏差(RSD)≤4.0％,室间相对标准偏差( RSD’)≤8.0％,相对误差(RE)≤±10.0％.在0.06 ～7.0 mg/L范围内实际样品平行双样测定质量控制指标为:相对偏差(RD)≤5.0％.加标回收率范围为90％ ～ 110％.