基于^(14)C同位素丰度的乙醇汽油中生物乙醇含量的测定

Determination of Bioethanol Content in Ethanol-Gasoline Blend Based on ^(14)C Isotopic Abundance

将煤制乙醇与不同来源的生物乙醇按不同体积比加入到汽油中配制成乙醇汽油。考察了采用加速器质谱(AMS)测定放射性同位素^(14)C丰度区分煤制乙醇与生物乙醇的适用性、测定乙醇汽油中生物乙醇含量的准确性以及在国内外4个加速器质谱实验室的再现性。结果表明:利用^(14)C同位素丰度计算生物基含量的方法可以区分煤制乙醇等化石基燃料与生物乙醇等生物基燃料;采用该方法测定一系列乙醇汽油样品中生物基含量,测定值与根据生物乙醇实际添加量计算的理论值的偏差不超过1百分点(绝对值);在4个加速器质谱实验室测定数据的再现性偏差不超过4百分点(绝对值)。

Coal-based ethanol and bioethanol from different sources were added to gasoline at different volume ratios to prepare ethanol-gasoline blends.The method of ^(14)C isotopic abundance measurement with accelerator mass spectrometry(AMS)to distinguish coal-based ethanol from bioethanol was investigated.The accuracy and reproducibility of bioethanol content determination in ethanol-gasoline blends were studied at four different accelerator mass spectrometry laboratories.Study results showed that coal-based ethanol and bioethanol could be distinguished by biobased carbon content calculated by ^(14)C isotopic abundance.Biobased carbon contents in a number of ethanol-gasoline blends have been examined by this method.Deviation between measured and theoretical values was within 1 percentage(absolute),and the reproducibility deviation in four different laboratories was within 4 percentage(absolute).