苯乙烯-丁二烯橡胶中结合苯乙烯含量标准物质的定值

Fixed Value of Standard Substance of Bound Styrene Content in Styrene-Butadiene Rubber

标准物质的研制一般经过均匀性检验、稳定性检验、定值和不确定度评定等重要环节。而标准物质的定值关系到标准物质标称值是否准确可靠,标准物质的定值工作显得尤为重要。苯乙烯-丁二烯橡胶中结合苯乙烯含量标准物质的定值采用8家行业权威实验室联合定值,采用狄克逊(Dixon)检验组间、组内是否存在可疑值,夏皮罗-威尔克Shapiro-Wilk法(W检验)检验定值数据是否正态分布,柯克伦(Cochran)检验定值数据是否等精度。通过定值数据的统计分析,在P=0.95的置信概率时,定值数据均处于等精度、正态分布、无可疑值。定值数据的总平均值40.72%为苯乙烯-丁二烯橡胶中结合苯乙烯含量标准物质的标称值。

The development of standard substances includes uniformity test,stability test,fixed value and uncertainty evaluation.The accuracy and reliability of the nominal value of the reference materials is related to fixed value,therefore the fixed value is particularly important.Combining with 8 laboratories to determine the value,the suspicious values between and within groups were tested by Dixon method,the normal distribution of all data were tested by the Shapiro-Wilk method,and the equal precision was tested by Cochran method.The fixed value data were in equal precision,normal distribution and no suspicious value at P=0.95.The average value 40.72%of the fixed value was the nominal value of the standard substance bound styrene content in styrene-butadiene rubber.