1. Pangang Group Panzhihua Iron Steel Research Institute Co.,Ltd.,Panzhihua 617000,China; 2. National Quality Supervision and Testing Center of Vanadium and Titanium Products,Panzhihua 617000,China; 3. State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Panzhihua 617000,China
Abstract：In strict accordance with the GB/T6379.2-2004 standard,a number of laboratories were coordinated to conduct precision tests for the determination of TiO2 in iron ore by ferric ammonium sulfate titrimetry. The data consistency and outliers were investigated with Mandel,Cochran,Grubbs and Dixon test methods,and the precision test data underwent statistical calculations with the EXCEL calculation tool to determine the functional relationship of precision for the analytical method. With repeatability r and reproducibility R,the inner-laboratory and inter-laboratory precision of the analytical method were truthfully and objectively reflected.
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