在气相色谱中使用在真空下运行的通过柱箱转移吸附解吸接口进行大体积进样。
Large volume injection in gas chromatography using the through oven transfer adsorption desorption interface operating under vacuum.
作者信息
Aragón Álvaro, Toledano Rosa M, Gea Sara, Cortés José M, Vázquez Ana M, Villén Jesús
机构信息
Escuela Técnica Superior de Ingenieros Agrónomos, Universidad de Castilla-La Mancha, Campus Universitario s/n, 02071 Albacete, Spain.
Escuela Técnica Superior de Ingenieros Agrónomos, Universidad de Castilla-La Mancha, Campus Universitario s/n, 02071 Albacete, Spain.
出版信息
Talanta. 2014 Jun;123:39-44. doi: 10.1016/j.talanta.2014.01.064. Epub 2014 Feb 4.
The present work describes a modification of the Through Oven Transfer Adsorption Desorption (TOTAD) interface, consisting of coupling a vacuum system to reduce the consumption of the helium needed to totally remove the eluent for large volume injection (LVI) in gas chromatography (GC). Two different retention materials in the liner of the TOTAD interface were evaluated: Tenax TA, which was seen to be unsuitable for working under vacuum conditions, and polydimethylsiloxane (PDMS), which provided satisfactory repeatability as well as a good sensitivity. No variability was observed in the retention times in either case. Solutions containing organophosphorous pesticides in two different solvents, a polar (methanol/water) and a non-polar (hexane) solvent, were used to evaluate the modification. The vacuum system coupled to the TOTAD interface allowed up to 90% helium to be saved without affecting the performance.
本研究描述了对直通加热炉转移吸附解吸（TOTAD）接口的一种改进，该改进包括连接一个真空系统，以减少在气相色谱（GC）中进行大体积进样（LVI）时完全去除洗脱液所需的氦气消耗。对TOTAD接口衬管中的两种不同保留材料进行了评估：发现Tenax TA不适合在真空条件下工作，而聚二甲基硅氧烷（PDMS）提供了令人满意的重复性以及良好的灵敏度。在这两种情况下，保留时间均未观察到变化。使用两种不同溶剂（一种极性溶剂（甲醇/水）和一种非极性溶剂（己烷））中含有有机磷农药的溶液来评估该改进。连接到TOTAD接口的真空系统可节省高达90%的氦气，且不影响性能。
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