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中文摘要：
在直喷式柴油机上，采用活性炭吸附-溶剂解吸／气相-质谱联用的方法，测量了燃用柴油、生物柴油及其调和油B50（体积比为50％生物柴油和50％柴油）排气中的单环芳香烃类污染物（MAHs）。研究结果表明：燃烧柴油时，苯和MAHs排放的平均浓度分别为0．53μg／L和5．51μg/L。与柴油相比，燃烧生物柴油可大幅降低MAHs排放的平均浓度，降低幅度为76％。燃烧柴油时，苯、甲苯等污染物的排放浓度随着负荷的增大而降低，中负荷时达到最低值，随着负荷进一步增大，其排放浓度明显增大，二甲苯排放浓度随负荷变化不明显。燃烧生物柴油和生物柴油调和油时，苯、甲苯和乙苯的排放浓度随负荷变化规律与燃烧柴油时基本一致。
英文摘要：
The mono-aromatic hydrocarbons （MAHs） were measured by a method of ＇ activated carbon adsorption-solvent desorption/GC-MS analysis＇ , and emission measurements were performed in a DI single-cylinder diesel engine fueled with pure diesel, biodiesel and biodiesel blends of 50%（B50）. Experimental results indicate that the mean concentrations of benzene and MAHs from diesel-fueled engine are 0. 53 μg/L and 5.51 μg/L, respectively. Comparing with pure diesel, the mean concentrations of MAHs emissions are reduced by 76% in biodiesel. The concentrations of MAHs decrease with the increase of load and turn to increasing with further increasing load. Concentrations of MAHs give them minimum values at middle load. The concentrations of xylene emission show little variation at different loads. Concentrations of benzene, toluene and ethylbenzene in the exhaust to the variation of load are same for B50,B100 and diesel fuel.
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