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...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。展开更多
Microwave irradiation was firstly attempted to prepare molecularly imprinted polymers(MIPs)monoliths,which were in situ prepared rapidly with methacrylic acid(MAA)as a functional monomer,ethylene glycol dimethacrylate...Microwave irradiation was firstly attempted to prepare molecularly imprinted polymers(MIPs)monoliths,which were in situ prepared rapidly with methacrylic acid(MAA)as a functional monomer,ethylene glycol dimethacrylate(EDMA)as a cross-linking agent,toluene and isooctane as the porogenic solvents and AIBN as an initiator.The baseline separation of isomers of hydroxybenzoic acid was achieved on these monolithic columns with 4-HBA as the template,but not on the blank polymer.Furthermore,some neutral compounds could also be baseline-separated on the imprinted polymer columns in the modes of pressure-driven capillary electrochromatography and low-pressure driven capillary electrochromatography.It was shown that the monoliths were not only used as the molecularly imprinted polymers but also as the reverse phase chromatographic material.展开更多
A novel monolithic stationary phase with long alkyl chain ligands was introduced and evaluated in pressurized capillary electrochromatography(p-CEC) by using a mixture of neutral and charged compounds. The capillary m...A novel monolithic stationary phase with long alkyl chain ligands was introduced and evaluated in pressurized capillary electrochromatography(p-CEC) by using a mixture of neutral and charged compounds. The capillary monolithic-column was prepared by in situ copolymerization of ethylene dimethacrylate,alkyl alcohol and 2-acrylamido-2-methyl-1-propanesulfonic acid in a quadruple porogenic solvent consisting of 1,4-butanediol/cyclohexanol/docecanol/water. Effects of experimental parameters in p-CEC,such as pressure and electrical field strength,on the separation were investigated. The baseline separation of the components in the mixture was achieved. The monolithic column can be used as an alternative to the conventional capillary column such as the reversed phase ODS.展开更多
文摘利用热导检测器（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。
文摘Microwave irradiation was firstly attempted to prepare molecularly imprinted polymers(MIPs)monoliths,which were in situ prepared rapidly with methacrylic acid(MAA)as a functional monomer,ethylene glycol dimethacrylate(EDMA)as a cross-linking agent,toluene and isooctane as the porogenic solvents and AIBN as an initiator.The baseline separation of isomers of hydroxybenzoic acid was achieved on these monolithic columns with 4-HBA as the template,but not on the blank polymer.Furthermore,some neutral compounds could also be baseline-separated on the imprinted polymer columns in the modes of pressure-driven capillary electrochromatography and low-pressure driven capillary electrochromatography.It was shown that the monoliths were not only used as the molecularly imprinted polymers but also as the reverse phase chromatographic material.
文摘A novel monolithic stationary phase with long alkyl chain ligands was introduced and evaluated in pressurized capillary electrochromatography(p-CEC) by using a mixture of neutral and charged compounds. The capillary monolithic-column was prepared by in situ copolymerization of ethylene dimethacrylate,alkyl alcohol and 2-acrylamido-2-methyl-1-propanesulfonic acid in a quadruple porogenic solvent consisting of 1,4-butanediol/cyclohexanol/docecanol/water. Effects of experimental parameters in p-CEC,such as pressure and electrical field strength,on the separation were investigated. The baseline separation of the components in the mixture was achieved. The monolithic column can be used as an alternative to the conventional capillary column such as the reversed phase ODS.
