顶空-气相色谱法测定B-100生物柴油中游离甲醇含量

Determination of Methanol Content in B-100 Biodiesel by Headspace Gas Chromatography

中文关键词:  顶空-气相色谱法  B-100生物柴油  甲醇

英文关键词:headspace gas chromatography  B-100 biodiesel  methanol

中文摘要:

      建立了顶空-气相色谱测定B-100生物柴油中游离甲醇含量的方法. B-100生物柴油样品使用N,N-二甲基乙酰胺溶解,90 ℃下顶空平衡45 min,在HP-INNOWAX色谱柱上进行分离和测定. 方法建立了外标法定量的标准曲线,相关系数r大于0.999,样品中甲醇质量分数的检出限为0.005%. 对实际样品进行检测,相对标准偏差为4.96%~6.83%(n=6),加标回收率为92.0%~110%. 方法操作简单、快速、重复性好,适用于B-100生物柴油中游离甲醇含量的测定.

英文摘要:

      A test method for the determination of methanol content in B-100 biodiesel by headspace gas chromatography has been established. The B-100 biodiesel sample was dissolved in N,N-dimethylacetamide and equalized at 90 ℃ for 45 min in the head-space sampler,then separated and determined on a gas-chromatograph through a HP-INNOWax capillary column. An external standard quantitative formula was established with the correlation coefficient more than 0.999. The limit of quantitation is 0. 005%. The relative standard deviations(n = 6) were between 4.96% and 6.83%. The recoveries was between 92% and 110%. This method is simple,rapid, accurate, and can be applied to the determination of methanol content in B-100 biodiesel.