1.1 This test method involves the quantitative determination by direct comparison of the differences (deltas) in analyzed properties between a test sample of spark ignition fuel or spark ignition base stock for oxygenate blending with that from a chemically similar comparison reference fuel using spectral analysis. 1.2 The test method uses an infrared (IR) or Raman spectroscopic analyzer with general multivariate calibrations for each of the properties to be tested. 1.3 The test method covers the methodology for obtaining the spark ignition fuel properties using the spectral analyzer measured deltas for each property between the fuel being tested and the reference fuel and the reference value of the reference fuel. 1.4 The comparison reference fuel is required to be similar in composition to the fuel sample to be analyzed. 1.5 Each separate spectroscopic technology is described as a separate procedure within this test method. Each will contain its own repeatability, reproducibility statements, between-methods reproducibility, and bias statement relative to some or all of the reference methods stated below. 1.6 Test Parameters Considered (Reference method): 1.6.1 Research Octane Number (D2699), 1.6.2 Motor Octane Number (D2700), 1.6.3 Antiknock Index (AKI) (D4814), 1.6.4 API or Specific Gravity at 60oF (D4052), 1.6.5 RVP, PTOT (D5191), 1.6.6 Tv/l=20, (D5188), 1.6.7 Aromatics, Vol%, 220.127.116.11 EPA (D5769), 18.104.22.168 CARB (D5580), 1.6.8 Olefins, 22.214.171.124 EPA, Vol% (D1319), 126.96.36.199 CARB, wt.% (D6550), 1.6.9. Benzene, Vol%, 188.8.131.52 EPA (D3606), 184.108.40.206 CARB (D5580), 1.6.10 Oxygen, wt.% and Ethanol, Vol%, 220.127.116.11 EPA (D5599), 18.104.22.168 CARB (D4815), 1.6.11 API Gravity (D4852), 1.6.12 Distillation (D86, evap), 22.214.171.124 IBP, 126.96.36.199 T10, 188.8.131.52. T50, 184.108.40.206 T90, 220.127.116.11. FBP, 18.104.22.168 E93.3 (E200), and 22.214.171.124 E148.9 (E300). 1.7 Instructions for selection, preparation, storage, and dispensing of reference fuels are provided in Annex A1. 1.8 Detailed instructions for determination of property values for the reference fuel are provided in Annex A2. 1.9 Detailed instructions on proper calibration creation and calibration transfer for each procedure are provided in Annex A3. 1.10 The values of operating conditions are stated in SI units and are considered standard. The values in parentheses are historical inch-pound units. 1.11 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. 1.12. This method is intended primarily for use by spark ignition fuel producing refineries with a well-defined set of specific blend components.
Certain types of spectroscopic analysis have been used to determine these properties and have demonstrated precision far superior to the referenced methods by ASTM D4814, EPA, and Federal Trade Commission. This standard method will then be cited as an alternative method by ASTM, EPA, CARB, and FTC. Currently, no such standard method exists. This will be constructed so that precision statements can be made.
KeywordsIR; FT IR; NIR; FT NIR; NMR; Raman
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
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