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Standard Test Method for Determination of pHe of Denatured Fuel Ethanol and Ethanol Fuel Blends
Automaticky přeložený název:
Standardní zkušební metoda pro stanovení pHe denaturovaného etanolu a ethanol palivové směsi
NORMA vydána dne 15.12.2014
Označení normy: ASTM D6423-14
Poznámka: NEPLATNÁ
Datum vydání normy: 15.12.2014
Kód zboží: NS-579952
Počet stran: 4
Přibližná hmotnost: 12 g (0.03 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
acid strength, automotive spark ignition engine fuel, corrosion potential, denatured fuel ethanol, ethanol, ethanol fuel blends, ethanol-hydrocarbon blends, fuel ethanol, pHe,, ICS Number Code 27.060.10 (Liquid and solid fuel burners)
Significance and Use | ||||||||
5.1 The acid strength, as measured by pHe, is a good predictor of the corrosion potential of ethanol fuels. It is preferable to total acidity because total acidity does not measure acid strength; overestimates the contribution of weak acids, such as carbonic acid; and can underestimate the corrosion potential of low concentrations of strong acids, such as sulfuric acid. |
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1. Scope | ||||||||
1.1 This test method covers a procedure to determine a measure of the acid strength of high ethanol content fuels. These include denatured fuel ethanol and ethanol fuel blends. The test method is applicable to denatured fuel ethanol and ethanol fuel blends containing ethanol at 51 % by volume, or more. 1.2 Acid strength as measured in this test method is defined as pHe. A pHe value for alcohol solutions is not comparable to pH values of water solutions. 1.2.1 The value of pHe measured will depend somewhat on the fuel blend, the stirring rate, and the time the electrode is in the fuel. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3.1 Hydrogen ion activity in water is expressed as pH and hydrogen ion activity in ethanol is expressed as pHe. 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 and health practices and determine the applicability of regulatory limitations prior to use. |
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2. Referenced Documents | ||||||||
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