Standard Test Method for Water in Ethanol and Hydrocarbon Blends by Karl Fischer TitrationName übersetzen
NORM herausgegeben am 1.6.2019
Bezeichnung normen: ASTM D7923-19
Ausgabedatum normen: 1.6.2019
Zahl der Seiten: 9
Gewicht ca.: 27 g (0.06 Pfund)
Land: Amerikanische technische Norm
Kategorie: Technische Normen ASTM
coulometric, ethanol, gasoline, hydrocarbon, Karl Fischer, pyridine-free, volumetric, water content,, ICS Number Code 75.160.20 (Liquid fuels)
|Significance and Use|
5.1 Blends of fuel ethanol and hydrocarbon have a limited solvency for water that is dependent upon temperature and the ratio of ethanol to hydrocarbon. Good handling practices are important during the blending, storage, and transportation of fuel to avoid water contamination. High concentrations of water can cause haze or phase separation in ethanol and hydrocarbon blends and lead to freezing problems at low temperatures. Water has also been associated with corrosion and filter plugging.
1.1 This test method covers the determination of water in blends of ethanol, hydrocarbon, and corresponding blends. It is intended for measuring water content of gasoline or other hydrocarbon blendstock, denatured fuel ethanol as cited in Specification , and ethanol fuel blends such as those cited in Specification and Practice . This test method is not applicable to samples that are phase separated.
1.1.1 Procedure A—For measurement of water from 0.004 % by mass to 1.63 % by mass in ethanol and hydrocarbon using coulometric Karl Fischer titration. This is the referee method for samples containing up to 1.63 % water.
1.1.2 Procedure B—For measurement of water from 0.02 % by mass to 5.41 % by mass in ethanol and hydrocarbon using volumetric Karl Fischer titration.
1.2 This method measures mass percent water and allows for the alternative reporting of volume percent. This test method recommends the use of pyridine-free reagents.
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Section .
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
|2. Referenced Documents|
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