Simplified Radiocarbon Analysis Procedure for Measuring the Renewable Diesel Concentration in Diesel Fuel Blends

Autor: Glenn A. Norton, Mary X. Woodruff
Rok vydání: 2011
Předmět:
Zdroj: Journal of the American Oil Chemists' Society. 89:797-803
ISSN: 1558-9331
0003-021X
DOI: 10.1007/s11746-011-1966-x
Popis: A simplified analytical approach for determining the renewable diesel content of diesel fuel blends using radiocarbon (14C) analyses in a liquid scintillation counter (LSC) was investigated. Unlike more conventional procedures, the fuels were mixed directly with a fluor and then analyzed in an LSC without further processing. The factory-installed quench curve adequately corrected for variable quench levels in the samples. When using a counting time of 180 min on samples containing 2–20% renewable diesel in fuel blends with relatively low quench levels, mean results from triplicate analyses were accurate to within 0.4% (absolute) and the standard deviations were generally 0.4% (absolute) or less. The accuracy and precision of the analyses were comparable to those observed for AMS and benzene synthesis analyses on the samples. For similar analyses on renewable diesel blends with relatively high quench levels, results were accurate to within 0.8% (absolute) with standard deviations of 0.8% or less when using a counting time of 180 min. The precision was improved significantly by increasing the counting time to 360 min for those samples. Excluding the conventional corrections for isotopic fractionation did not have a significant impact on the accuracy of the results for renewable diesel concentrations of 20% or less.
Databáze: OpenAIRE
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