摘要
建立了液化石油气的毛细管柱气相色谱测定方法,用正交试验法筛选出优化试验条件。在优化条件下,液化石油气样品在10 min内完成分析,液化石油气3个主要成分丙烷、异丁烷及正丁烷的检出限(S/N=3)分别为0.428 2、0.488 6、0.639 3 ng,定量下限(S/N=10)分别为1.427、1.629、2.131 ng,分别在1.338×105～1.982×105、1.719×105～2.595×105 ng和1.776×105～2.595×105ng范围内线性关系良好(r分别为0.999 3、0.999 0、0.999 6)。该方法操作简便、灵敏度高、重复性好,可用于液化石油气的测定。
A method for the determination of liquefied petroleum gases （LPG） is established by capillary gas chromatography.The optimum experimental conditions are obtained by using orthogonal design.LPG samples are separated on a SE-30 at 35℃ and detected by a flame ionization detector （FID） at 200℃.Other experimental condition are as follows：nitrogen as carrier gas at a flow rate of 1.0 ml/min,30∶1 of split flow ratio,150℃ of the injector temperature.Under optimum conditions,a separation run of a LPG sample can be finished within 10 min.The proposed method allows the determination of the main components of LPG in the linear range are 1.338 × 105-1.982 × 105 ng （r =0.999 3） for propane,1.719 × 105-2.595 × 105 ng（r =0.999 0） for isobutane,1.776 × 105-2.594 × 105 ng （r =0.999 6） for n-butane.The detection limits are 0.428 2 ng for propane,0.488 6 ng for isobutane,0.639 3 ng （3σ） for n-butane.The minimum detection limits are 1.427 ng,1.629 ng and 2.131 ng.The method is simple,fast,accurate,and suitable for the determination of the major chemical components of LPG.
出处
《现代化工》
CAS
CSCD
北大核心
2013年第8期123-127,共5页
Modern Chemical Industry
基金
广东省科技厅资助项目
关键词
液化石油气
毛细管气相色谱
正交试验
liquefied petroleum gases
capillary gas chromatography
orthogonal design
