ASTM D4053 Test Method for Benzene in Motor and Aviation Gasoline by Infrared Spectroscopy
1. Scope
1.1 This test method covers the determination of the percent benzene in full-range gasoline. It is applicable to concentrations from 0.1 % to 5 volume %.
1.2 The values in SI units are regarded as the standard.
1.3 This test method has not been validated for gasolines containing oxygenates.
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. For specific hazard statements, see Section 8 and 9.1.
2. Referenced Documents
2.1 ASTM Standards:
D4057 Practice for Manual Sampling of Petroleum and Petroleum Products
E 131 Terminology Relating to Molecular Spectroscopy
E 932 Practice for Describing and Measuring Performance of of Dispersive Infrared Spectrophotometers
E 1421 Practice for Describing and Measuring Performance of Fourier Transform Infrared (FT-IR) Spectrometers: Level Zero and Level One Tests
3. Terminology
3.1 Definitions:
3.1.1 Definitions of terms and symbols relating to absorption spectroscopy in this test method shall conform to Terminology E 131. Terms of particular significance are the following:
3.1.2 absorbance, A, n - the molecular property of a substance that determines its ability to take up radiant power, expressed by:
A = log10(1/T) = -log10T
where
T = the transmittance as defined in 3.1.5.
3.1.3 radiant energy, n - energy transmitted as electromagnetic waves.
3.1.4 radiant power, P, n - the rate at which energy is transported in a beam of radiant energy.
3.1.5 transmittance, T, n - the molecular property of a substance that determines its transportability of radiant power, expressed by:
T = P/Po
where:
P = the radiant power passing through the sample, and
Po = the radiant power incident upon the sample.
