在毛细管气相色谱法(CGC)中,采用大体积进样技术(LVI),即使用能够容纳大体积样品的进样装置以及增加可控时间的溶剂蒸汽放空装置,可以满足环境样品中超痕量组分的分析要求,简化样品浓缩步骤以及实现液相色谱(LC)与CGC的在线联用.针对分析物的性质、毛细管柱的规格和分析的目的已发展了多种LVI.本文总结了几种常见的LVI,包括柱头进样(OCI)和程序升温进样(PTV),以及近年来发展的一些新技术,如在柱同时溶剂浓缩进样、样品直接引入进样/复杂基质进样和同时溶剂冷凝无分流进样,阐述了各种进样技术的基本原理及其与样品提取、LC纯化在线联用的方法在环境分析应用中的一些最新研究进展.
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