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| Uncertainty Evaluation for the Determination of the Retention Ratio of the Ultrafiltration Membrane by PEG-20000 |
| WANG Xu-liang,LI Zong-yu,ZHANG Yan-ping,HAO Jun,PAN Xian-hui |
1. The Institute of Seawater Desalination and Multipurpose Utilization, SOA (Tianjin), Tianjin 300192, China
2. National Quality Supervision & Inspection Center for Seawater & Brackish Water Utilization Products, Tianjin 300192, China |
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Abstract 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 R2 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%.
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Received: 08 September 2016
Published: 29 December 2017
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2018, Vol. 39 
