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(a) To comply with the requirements of this chapter, the oxygen content of gasoline must be determined by
(1) taking a representative sample of the gasoline to be tested, using the sampling methods specified in 40 C.F.R. 80, Appendix D, as amended through July 1, 1996, hereby adopted by reference;
(2) testing the gasoline sampled to determine the mass concentration of each oxygenate, using the test method specified in ASTM D 4815-94a, as approved July 25, 1994, hereby adopted by reference; and
(3) using the following oxygen content calculations, with volume measurements adjusted to 60ΓΈ Fahrenheit:
(A) for blends with only one oxygenate:
V oxygenate x d oxygenate x W oxygen/oxygenate W oxygen = ______________________________________________ (V gas x d gas ) + (V oxygenate x d oxygenate ) where: W = weight fraction (for percent, multiply by 100) oxygenate = oxygenate in the blend V = volume fraction d = specific gravity gas = gasoline (B) for blends with more than one oxygenate: S (V oxygenate x d oxygenate x W ioxygen/oxygenate ) W oxygen = ______________________________________________ (V gas x d gas ) + S (V oxygenate x d oxygenate ) where: W = weight fraction (for percent, multiply by 100) oxygenate = oxygenate in the blend V = volume fraction d = specific gravity gas = gasoline
(b) The oxygen molecular weight contributions of an oxygenate approved for use under this chapter are set out in the following table:
OXYGEN MOLECULAR WEIGHT CONTRIBUTIONS
Oxygen Specific Molecular Gravity Weight at 60ΓΈ Contribution Fahrenheit Methanol 0.4993 0.796 Ethanol 0.3473 0.794 Propanols 0.2662 0.789 Butanols 0.2158 0.810 Pentanols 0.1815 0.817 Methyl Tertiary-Butyl Ether (MTBE) 0.1815 0.744 Hexanols 0.1566 0.823 Ethyl Tertiary-Butyl Ether (ETBE) 0.1569 0.755 Tertiary Amyl Methyl Ether (TAME) 0.1566 0.770
History: Eff. 9/25/92, Register 123; am 10/31/97, Register 144
Authority: AS 44.46.020
Editor's note: The sampling and testing procedures referred to in this section may be reviewed at the department's Anchorage, Fairbanks, or Juneau offices. ASTM D 4815-94a may be ordered from the American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428 (610-832-9500).
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Last modified 7/05/2006