According to the control chart method in Routine methods for evaluation and expression of measure-ment uncertainty in testing laboratory(GB/T 27411-2012),under the condition of period precision measurement,this paper repeatedly measures arsenic in soil according to Soil and sedimen—Determination of mercury,arsenic,selenium,bismuth,antimony—Microwave dissolution/Atomic fluorescence spectrometry(HJ 680-2013),and ob-tains 34 sets of measurement data.This paper firstly calculates its normality statistics(A2*)and judges the normality,independence and resolution suitability of the data,then it draws a control chart and uses the out-of-control crite-rion to judge that the measurement system is under control,and it finally uses t-tests to judge the control for the statistical bias of the data.When all three are met,the period precision standard deviation can be regarded as the measurement uncertainty of arsenic in soil in the laboratory.
关键词
不确定度评定/控制图法/土壤中砷/原子荧光法/环境检测
Key words
Uncertainty evaluation/Control chart method/Arsenic in soil/Atomic fluorescence spectrometry/Environmental detection
维普
万方数据