用溶胶-凝胶(sol-gel)技术制备了羟基-苯并冠醚毛细管气相色谱固定相,并测定了它的色谱性能.结果表明该柱具有柱效高>3 000/m、热稳定性好(330 ℃)和去活能力强的优点.与溶胶-凝胶羟基硅油柱相比,该柱具有良好的选择性.一些芳香族位置异构体如二甲苯、二氯苯、硝基甲苯和硝基氯苯在溶胶-凝胶羟基-苯并冠醚柱上得到了很好的分离.该柱具有很高的柱容量,一些不能在冠醚聚硅氧烷上分离的小分子化合物,如小分子醇、酯、酮、短链脂肪酸和挥发性的胺,在溶胶-凝胶冠醚柱上有很好的分离.
A new kind of crown ether, OH-dibenzo-14-crown-4 (OH-DB14C4), is preparedand coated onto the fused silica capillary by sol-gel process. Chromatographiccharacteristics including column efficiency (>3 000 plates/m), thermal stability(to 330 ℃) and ability of deactivation are studied. The selectivity of newstationary phase is superior to sol-gel OH-terminal silicone oil (OH-TSO) forpositional isomers of some aromatic compounds such as xylene, dichlorobenzene,nitrotoluene, nitrochlorobenzene. The new stationary phase has high sample capacityfor separation of small molecular mass compounds: low-molecular-mass alcohols,ethers and ketones, short-chain fatty acids and volatile amines.
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