Standard Test Method for Determining the Biobased content of Liquid Hydrocarbon Fuels Using Liquid Scintillation Counting with Spiked Carbon-14

Importancia y uso:

5.1 This test method provides accurate biobased/biogenic carbon content results to materials whose carbon source was directly in equilibrium with CO₂ in the atmosphere at the time of cessation of respiration or metabolism, such as the harvesting of a crop or grass living in a field. Special considerations are needed to apply the testing method to materials originating from within artificial environments with non-natural levels of ¹⁴C or if the biofeed was grown over the course of several years such as trees and contains “bomb-carbon.” Application of these test methods to materials derived from CO₂ uptake within artificial environments is beyond the present scope of this standard.

5.2 This method uses LSC techniques to quantify the biobased content of a liquid hydrocarbon fuels using sample carbon that has been unmodified. It is designed to be able to incorporate into a refinery laboratory to support biofeed and petroleum coprocessing or blending operations to determine the biocarbon content of the intermediate or finished products. The test results can then be used for optimizing internal parameters or reporting to regulatory agencies.

5.3 The use of this method requires that a pure petroleum-based sample can be generated that has a similar matrix to each product or stream to be analyzed. For example, gasoline and diesel have very different matrices and will likely require the use of different background measurements for each. Refer to 10.2 for how to determine if the same background sample can be used for more than one product/stream.

Subcomité:

D02.04.0F

Volúmen:

05.05

Número ICS:

75.160.20 (Liquid fuels)

Palabras clave:

biobased; bomb carbon; ¹⁴C (carbon-14); carbon dating; liquid scintillation counting; new carbon; old carbon; percent modern carbon;