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5.1x00a0;This test method provides a method of determining the percentage of ethanol in an ethanol-gasoline fuel blend over the range of 20 to 100 mass% for compliance with fuel specifications and federal or local fuel regulations.
5.2x00a0;Ethanol content of denatured fuel ethanol for gasoline blending is required in accordance with Specification D4806.
5.3x00a0;Ethanol content of ethanol fuel blends for flexible-fuel automotive spark-ignition engines is required in accordance with Specification D5798.
1.1x00a0;This test method covers the determination of the ethanol content of hydrocarbon blends containing greater than 20% ethanol. This method is applicable to denatured fuel ethanol, ethanol fuel blends, and mid-level ethanol blends.
1.2x00a0;This test method does not purport to identify all individual components common to ethanol production or those components that make up the denaturant or hydrocarbon constituent of the fuel.
1.3x00a0;Water cannot be determined by this test method and shall be measured by a procedure such as Test Method D1364 and the result used to correct the concentrations determined by this method.
1.4x00a0;This test method is inappropriate for impurities that boil at temperatures higher than 225x00b0;C or for impurities that cause poor or no response in a flame ionization detector, such as water.
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