采用DNPH衍生法和液相色谱(HPLC)技术对生物柴油发动机排气中的羰基化合物(醛、酮)进行了捕集和分离测定,通过燃用BD100,BD50,BDO三种不同调合比例的生物柴油,测量了标定转速,不同负荷下的醛、酮污染物.在此基础上,分析了燃料组分、燃烧参数、排气温度等因素对醛、酮污染物排放的影响.结果表明,根据衍生剂与羰基化合物中的羰基专一性反应特性,运用液相色谱仪,可以对柴油机污染物中的微量醛、酮进行准确、快速测定;三种不同调合比例燃料的醛、酮污染物排放中,甲醛含量较高占81%,其它羰基类物质乙醛、丙醛、丙烯醛、丙酮等物质的所占比例较小;随着负荷的增加,BDO、BD50的甲醛及羰基类其它物质有所增加,BD100则有所降低.“,”Aldehydes and ketones emissions from the diesel engine were sampled,captured and measured by using the method of 2,4-dinitrophenyl hydrazine(DNPH)and High Performance Liquid Chromatography(HPLC).The emissions character of Carbonyl on different loads were investigated, and influence factors such as composition of fatty acid,combustion parameters,and exhaust temperature were analyzed.The result show that,The method was ideal for the simultaneous determination of aldehyde and ketone emissions;The content percent of formaldehyde among the carbonyl emission is the highest.The other carbonyl such as acetaldehyde,acrolein,acetone,were just a small proportion among the total carbonyl emissions.As the load increased,the carbonyl emissions of BDO and BD50 increased,while the carbonyl emissions of BD100 decreased.