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  _____     ______   ______      ___     _    _   
 / ____||  /_   _// |      \\   / _ \\  | |  | || 
/ //---`'   -| ||-  |  --  //  / //\ \\ | |/\| || 
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  `----`   `-----`  `------`  `-`   `-` `-`   `-`

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Text this: Trace analysis by combined use of off-line solid-phase extraction, on- column sample focusing and U-shape flow cell in capillary liquid chromatography