SPB-1毛细管色谱柱—TCD联用系统

On-line system of SPB-1 capillary chromatographic column-thermal conductivity detector

利用热导检测器（TCD）的原理,将改装后的GC3900T气相色谱仪与SPB-1毛细管柱联用,对尾吹流量、线速度等影响因素进行研究。以氦气作载气,分别利用正庚烷、硝基苯、苯酚、苯胺、乙酸丁酯以及正丁醇作为试样测定联用系统的最佳线速度,并用正庚烷研究了尾吹流量对柱效、信号的影响以及桥流与响应值之间的关系。结果显示,其最佳载气线速范围在15～18 cm/s,合适的尾吹流量为13～14 m L/min,并验证了响应值与桥流的三次方成正比。联用系统已应用于对氢火焰检测器（FID）无响应或响应极小的三氯氢硅和乙烯基三氯硅烷的检测。

Based on the principle of thermal conductivity detector（ TCD）,the modified GC3900 T and SPB-1capillary column were used to study the influence factors such as the make-up flow rate and carrier gas velocity.Taking helium as carrier gas,the optimal linear velocity of combined system has been studied. N-heptane,nitrobenzene,phenol,aniline,butyl acetate and n-butanol have been used as test samples to determinate the optimal linear velocity. Similarly,the n-heptane has been used to study the effect of tail flow rate on column efficiency and signal,and the relationship between bridge current and response value. The results showed that the optimal carrier gas velocity and the appropriate make-up flow rate were ranging from 15 to 18 cm / s and 13 to14 m L / min,respectively. Response value is shown to be proportional to the third bridge current that also has been verified. On the basis of this,the combined system could have potential applications in detection of trichlorosilane and vinyltrichlorosilane with no response or response to the minimum substance for the hydrogen flame ionization detector（ FID）.