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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 GC3900T gas chromatograph was used in combination with the SPB-1 capillary column to study the influencing factors of tail flow and linear velocity. Using helium as the carrier gas, the optimal linear velocity of the combined system was measured by using n-heptane, nitrobenzene, phenol, aniline, butyl acetate and n-butanol respectively. The effects of tail gas flow Effect on efficiency, signal, and relationship between bridge current and response. The results show that the optimum linear velocity of the carrier gas is in the range of 15-18 cm / s and the suitable tail flow rate is 13-14 m L / min, and the response value is proportional to the cubic of the bridge flow. The combined system has been used for the detection of trichlorosilane and vinyltrichlorosilane that are unresponsive or have minimal response to hydrogen flame detectors (FIDs).