The water content reference material of water saturated octanol.
- Author:
Haifeng WANG
1
;
Kang MA
;
Wei ZHANG
;
Zhanyuan LI
Author Information
1. National Institute of Metrology, Beijing 100013, China. wanghf@nim.ac.cn
- Publication Type:Journal Article
- MeSH:
Biofuels;
standards;
Magnetic Resonance Spectroscopy;
methods;
Octanols;
chemistry;
Reference Values;
Water;
analysis
- From:
Chinese Journal of Biotechnology
2011;27(3):510-515
- CountryChina
- Language:Chinese
-
Abstract:
The national standards of biofuels specify the technique specification and analytical methods. A water content certified reference material based on the water saturated octanol was developed in order to satisfy the needs of the instrument calibration and the methods validation, assure the accuracy and consistency of results in water content measurements of biofuels. Three analytical methods based on different theories were employed to certify the water content of the reference material, including Karl Fischer coulometric titration, Karl Fischer volumetric titration and quantitative nuclear magnetic resonance. The consistency of coulometric and volumetric titration was achieved through the improvement of methods. The accuracy of the certified result was improved by the introduction of the new method of quantitative nuclear magnetic resonance. Finally, the certified value of reference material is 4.76% with an expanded uncertainty of 0.09%.
