摘要
采用自行设计的聚乙烯薄膜渗透装置，以液化石油气为研究对象，建立了一种用气相色谱测定薄膜的混合气体渗透性的新方法。薄膜渗透装置由渗透池、四通阀、控温装置组成，具有操作简便、制作成本低的特点。根据非多孔膜的渗透机理和气相色谱的特点，对分析方法进行优化，最佳渗透时间和吹扫时间分别为15min和15s；丙烷、异丁烷和正丁烷分别在1．338—1．982×10^5，1．719—2．595×10^5，1．719—2．595×10^5ng范围内线性关系良好，相关系数（r^2）为0．9990～0．9996；丙烷、异丁烷和正丁烷的方法检出限分别为0．472，0．534，0．692ng，定量下限分别为1．573，1．779，2．307ng；相对标准偏差均小于10％；在相同条件下，各烷烃的渗透系数和渗透稳定时间不同。该方法具有灵敏度高、快速、准确等优点，适用于多种气体共存条件下同时测定膜材料的多成分渗透性。
A method was established for the determination of multi-components permeability of liquefied petroleum gas through polyethylene membrane by gas chromatography with a self made permeabil- ity apparatus. The method was optimized according to the membrane permeability mechanism as well as the characteristics of gas chromatography（ GC）, and the infiltration time and purging time were set at 15 min and 15 s, respectively. Good linearities for propane, /so-butane and n-butane were obtained in the range of 1. 338 - 1. 982 × 10^5 , 1. 719 -2. 595 × 105, 1. 719 -2. 595 × 10^5 ng, respectively, with correlation coefficients（ r2 ） of 0. 999 0 - 0. 999 6. The limits of detection for propane, /so-butane and n-butane were 0. 472, 0. 534 and 0. 692 ng, and the limits of quantitation were 1. 573, 1. 779 and 2. 307 ng, respectively. The relative standard deviations were less than 10% . Temperature was a major factor affecting the osmotic equilibrium and permeability coefficient. Under the same conditions, the permeability coefficient and penetration equilibrium time of the each alkane were different. The experimental results indicated that the developed method was simple, fast, and sensitive for the determination of membrane permeability under a condition of multiple gas coexistence.
出处
《分析测试学报》
CAS
CSCD
北大核心
2014年第7期798-803,共6页
Journal of Instrumental Analysis
关键词
混合气体
膜材料
渗透性
气相色谱
mixed gas
membrane material
permeability
gas chromatography （GC）
