聚乙二醇法测定超滤膜截留率的不确定度评定  

Uncertainty Evaluation for the Determination of the Retention Ratio of the Ultrafiltration Membrane by PEG-20000

作　　者：王旭亮 李宗雨 张艳萍 郝军 潘献辉 

机构地区：[1]国家海洋局天津海水淡化与综合利用研究所,天津300192 [2]国家海水及苦咸水利用产品质量监督检验中心,天津300192

出　　处：《计量学报》2018年第1期119-124,共6页Acta Metrologica Sinica

基　　金：国家科技支撑计划(2014BAB06B00);中央级公益性科研院所基本科研业务费专项(K-JBYWF-2015-T15;K-JBYWF-2016-G15);国家海洋公益性行业科研专项(201105025);国家海洋局青年海洋科学基金(2013450)

摘　　要：截留率和切割分子量是表征超滤膜截留性能的主要技术参数。以聚乙二醇-20000为标准物质,建立截留率测试结果的不确定度评定数学模型,分析不确定度来源,评定超滤膜截留率测试结果的不确定度。结果表明,PEG-20000的多分散系数(M_w/M_n)为1.005,优于标准中对截留测试标准物质的分子量分布系数小于1.8的要求,GPC谱图呈现单峰形式,符合PEG结构明确、分子量分布窄的特点,完全满足测试需要,标准测试曲线线性好、相关系数R2~大于0.999;通过重复性实验,测定了超滤膜对PEG-20000的截留率为93.04%,对该结果进行了A类和B类不确定度评定,当包含因子k=2、置信水平为95%时,扩展不确定度为2.90%。Molecular weight cut off and retention are two technical parameters of ultrafiltration membrane performance. Choosing PEG-20000 as a standard substance, establishing evaluation mathematical model of uncertainty of retention test results to analyze the sources of uncertainty, the retention test results were evaluated. The results indicates that the polydispersity coefficient（Mw/Mn）of PEG-20000 is 1.005, which is better than the standard test for molecular weight cut-off standard material distribution coefficient less than the requirements of 1.8 and GPC spectrum showed a single peak form, in line with PEG clear structure, molecular weight distribution narrow features, which fully meet the testing needs. There is a good linear relation between ABS and concentration in the standard curve and the correlation coefficient R^2 is over 0.999. The retention ratio of the ultrafiltration membrane by PEG-20000 is 93.04%, through repeated experiment. The results were evaluated type A and type B uncertainty. It showed that expanded uncertainty is 2.90% when coverage factor is k=2 and level of confidence is 95%.

关 键 词：计量学 超滤膜 截留率 聚乙二醇 不确定度评定 

分 类 号：TB99[一般工业技术—计量学]