Use of radiocarbon analyses for determining levels of biodiesel in fuel blends -- Comparison with ASTM Method D7371 for FAME

► Radiocarbon analysis of biodiesel fuel blends to determine biofuel percentage. ► Analysis of fuel blends containing biodiesel from four different feedstocks. ► Alternative analytical approach involving direct analysis of fuel in a LSC. ► Direct LSC radiocarbon method works at least as well as IR methods. ► Results are generally accurate to within 0.3% (absolute) or better.