Abstract
Very few studies report the detailed organic chemical composition of biodiesel exhaust PM despite reports that biodiesel exhaust PM leads to more adverse health effects than diesel exhaust PM. Here, we compare light-duty diesel engine exhaust particle-phase emission rates (ng/μg PM) of target nonpolar organic analytes—19 n-alkanes, 16 priority PAHs, and 10 fatty acid methyl esters (FAMEs)—during transient operation for 5 recycled waste vegetable oil (WVO; B00, B10, B20, B50, and B100) and 3 virgin soybean oil (soybean; B00, B20, and B100) biodiesel blends (where Bxx = volume % biodiesel). Biodiesel fuels were blended volumetrically from ultralow sulfur diesel (ULSD) and B100 from each feedstock. FAMEs emission rates were 3–7 times higher than n-alkanes for the common B20 blend, increasing to 60–100 times for B100. Both total n-alkanes and total FAMEs emission rate trends with Bxx were consistent with expected values based on fuel volume percent and similar ratios to ULSD were observed for both feedstocks....
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