Section 18.53.030. Sampling, testing, and oxygen content calculations.

	(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 60_ Fahrenheit:  
        (A) for blends with only one oxygenate: 
                             V oxygenate x d oxygenate x W oxygen/oxygenate   
________________________
                              (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) 
________________________
                            (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 60_
                        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

Authorities

44.46.020;46.03.010;46.03.020;46.14.020;46.14.030;46.14.510

Notes

Reference

18 AAC 53.005
18 AAC 53.020

Authority

AS 44.46.020 AS 46.03.010 AS 46.03.020 AS 46.14.020 AS 46.14.030 AS 46.14.510 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).

History

Eff. 9/25/92, Register 123; am 10/31/97, Register 144