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| Uncertainty Evaluation for the Determination of the Retention Ratio of the Ultrafiltration Membrane by BSA-67000 |
| WANG Xu-liang,ZHAO Jing-hong,LI Zong-yu,HAO Jun,PAN Xian-hui |
1. The Institute of Seawater Desalination and Multipurpose Utilization, SOA (Tianjin), Tianjin 300192, China
2. National Quality Supervision and Inspection Center for Seawater & Brackish Water Utilization Products, Tianjin 300192, China |
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Abstract Retention performance is the most important performance indicator of ultrafiltration membrane performance, including two technical parameters which are molecular weight cut off and retention.Based on GB/T 32360—2015 "Test Methods for Ultrafiltration Membrane", according to the JJF 1059—2012 "Evaluation and Expression of Uncertainty in Measurement", BSA-67000 was choosed as standard substance, evaluation mathematical model of uncertainty of retention test results was established to analyze the sources of uncertainty, and the retention test results were evaluated.The results indicated that the polydispersity coefficient(Mw /(Mn) of BSA-67000 is 1.101 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.The results were evaluated uncertainty.It showed that expanded uncertainty is 7.86%, when coverage factor is k=2 and level of confidence is 95%.Uncertainty of the measurement results were mainly from the removing the test sample, repeatability and spectrophotometric determination of BSA-67000.
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Received: 11 September 2017
Published: 07 March 2019
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2019, Vol. 40 
