多实验室测定汽油氯含量试验结果比对研究

COMPARISON OF CHLORINE CONTENT IN GASOLINETESTED BY INTER-LABORATORY

采用频率分布统计法和稳健Z比分数统计法对汽油中氯含量测定结果进行分析研究。结果表明,每个样品的算术平均值与中位数相差均不大,结果分布较对称,频率分布近似正态分布。试验比对中采用X射线荧光光谱(XRF)法和氧化微库仑法,两个方法的测定结果算数平均值没有显著性的差异。XRF法具有操作简单、分析速度快、精密度高、稳定性好等特点,试验比对中XRF法测定结果偏差比氧化微库仑法小。Z比分数评价结果整体满意率为88.2%,表明相关实验室的检测水平较高,能为油品中氯含量的检测提供可靠的支撑。

A comparative study on the determination of chlorine in gasoline was carried out,and a total of 51 laboratories reported their testing results.The results of chlorine content were analyzed by frequency distribution statistics and robust Z-ratio statistics.The results showed that there was little difference between the arithmetic mean and the median value of each sample,and the distribution of results was symmetrical.The frequency distributions of the results were approximately normal.Two methods were used in the comparative study:X-ray fluorescence spectrometry and oxidative microcoulometry.There was no significant difference between the arithmetic means of the two methods.X-ray fluorescence spectrometry has the characteristics of simple operation,fast analysis speed,high precision and good stability,and the deviation of the results was smaller than that of oxidative microcoulometry in this comparative study.The overall satisfaction rate of Z-score evaluation was 88.2%,which indicated that the detection level of related laboratories was high and could provide reliable support for the detection of chlorine content in petroleum products.