The Uncertainty of SiO2 in Iron Ore Determined by X-ray Fluorescence Spectrometry Evaluated by Top-Down Control Chart Method
According to the standard method GB/6730.62-2005,iron ores-determination of calcium,silicon,magnesium,titanium,phosphorus,manganese,aluminum and barium content-wavelength dispersive X-ray fluorescence spectrometry method,the content of SiO2 in iron ores was determined.The certified reference material YSBC 14721-98,which contains 8.78％ SiO2,was taken as the quality control sample,and 20 datas were obtained by measuring the quality control sample at different time by different operator,after outlier testing,according to the GB/T 27407-2010 and the GB/T 27411-2012,the uncertainty was evaluated by Top-Down technical control chart method.The intermediate precision was between the standard deviation of repeatability and reproducibility,which was reasonable.An iron ore sample was determined,the content of SiO2 was 5.24％,the uncertainty was 0.0256％,the uncertainty u(b)was 0.0313％,the standard uncertainty u was 0.0404％,under the coverage probability p=95％ and the coverage factor k=2,the expanded uncertainty U was 0.08％.This evaluation method not only obtains the uncertainty,but also combines with the daily quality control to ensure the detection quality,which should promote using in the laboratories.
国家科技期刊平台
NSTL
万方数据
