Optimisation of a batch thermal combustion method using a tube furnace oxidation system (pyrolyser) and LSC for carbon-14 determination in environmental matrices

D’Souza, Renita Shiny; Nayak, Sridhara; Mohan, M.P.; Bharath, S.; Krishnan, K. Arya; Kamath, Srinivas S.; Diéguez, Ana Isabel Irimia; Agulló, Lidia; Gómez-Martínez, Isabel; Arévalo, Francisco Javier Santos; Garcı́a-Tenorio, R.; Ravi, P. M.; Karunakara, N.

doi:10.1016/j.jenvrad.2020.106345

Cited by 4 publications

(1 citation statement)

References 42 publications

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“…As mentioned, this is a time-consuming, laborious, and potentially hazardous process. Alternative approaches include diluting the sample in an optically clear liquid (e.g., toluene) and fuel conversion to CO 2 . − Diluting the fuel will reduce the color intensity but also reduces the sample size of biogenic carbon which negatively affects the precision of 14 C determination. Conversion of the fuel to CO 2 (followed by absorption of that CO 2 into an amine solution) also has a limited sample size (1.6–2.5 g CO 2 ), and the precision of this technique is currently not adequate for low blend-level fuels. , …”

Section: Introductionmentioning

confidence: 99%

Decolorization of Biofuels and Biofuel Blends for Biogenic Carbon Quantification with Liquid Scintillation Radiocarbon Direct Measurement

Lee

Christensen

et al. 2022

Energy Fuels

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Radiocarbon activity of fuels is a direct analog to the biogenic fraction of carbon in the fuel. The amount of radiocarbon in a fuel sample may be determined by liquid scintillation direct analysis if the sample is relatively transparent to ultraviolet light. However, many biofuels are colorful which adversely affects the counting efficiency of this technique and therefore the precision which the biofuel blend level may be determined. In such cases, decolorization may be an approach to improve measurement precision. Here, we present the effectiveness of several decolorization techniques for different fuel types. For some fuels, decolorization impacted the radiocarbon content of the sample; therefore, caution is necessary to ensure reliable assessment of biofuel blend levels.

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