Amador-Hernández J, Fernández-Romero J M, Luque de Castro M D
Department of Analytical Chemistry, Faculty of Sciences, University of Córdoba, Córdoba, Spain.
Talanta. 1999 Jul 12;49(4):813-23. doi: 10.1016/s0039-9140(99)00069-7.
A commercially available supercritical fluid extractor provided with carbon dioxide was coupled to a dual-beam thermal lens spectrometer with a pumpprobe coaxial configuration, pumped by a pulsed Nd-YAG laser operating at the fundamental wavelength of 1064 nm. As a preliminary step, several compounds were studied in batch regime using carbon tetrachloride as solvent, in order to observe the influence of overtones and combinations involving distinct chemical bonds on thermal lens spectrometry (TLS). Several factors related with supercritical fluid extraction (SFE) under hydrodynamic conditions were studied in order to establish their influence both in the extraction yield and thermal lens signal magnitude obtained. The advantages and limitations of the hyphenated SFE-TLS technique proposed are discussed, and the possibility of on-line detection in SFE with a pulse thermal lens spectrometer was demonstrated.
一台配备二氧化碳的市售超临界流体萃取器与一台具有泵浦-探测同轴配置的双光束热透镜光谱仪相连，由一台工作在1064nm基波波长的脉冲Nd-YAG激光器泵浦。作为初步步骤，使用四氯化碳作为溶剂，在间歇模式下研究了几种化合物，以观察涉及不同化学键的泛音和组合对热透镜光谱法（TLS）的影响。研究了与流体动力学条件下超临界流体萃取（SFE）相关的几个因素，以确定它们对萃取产率和所获得的热透镜信号强度的影响。讨论了所提出的联用SFE-TLS技术的优点和局限性，并证明了使用脉冲热透镜光谱仪在SFE中进行在线检测的可能性。
