LCGC The Peak - April 2008 - (Page 18) 18 THE PEAK APRIL 2008 (a) (b) S/N increased by 77% Figure 1: Response for a 1% rose oil injection using (a) a liner containing no glass wool and (b) a liner containing glass wool. (constant flow) Detector: MSD at 230 °C, 45-450 amu Sample: 1 % rose oil in ethyl acetate Two injections of rose oil were made, each using a different style of liner. One injection was made on a single-taper gooseneck liner without glass wool and the other on a single-taper gooseneck liner with glass wool. All other GC parameters remained constant. Results and Discussion Inlet discrimination occurs when making a split injection of a mixture containing a wide range of molecular weights because the higher molecular weight compounds are slower to volatilize and enter the gas phase nearer to the split vent. This means that a greater proportion of these slow-tovolatilize compounds are swept out of the split vent than the lighter, more volatile compounds. However, this problem sometimes can be reduced by selecting a different style of liner for the analysis. A liner without glass wool increased sample discrimination because the location of volatilization was uncontrolled (Figure 1a). When making a liquid injection, the entire sample does not volatilize fully. Upon injection, the portion of the sample containing the more volatile components vaporizes quickly and enters the column. The remaining liquid makes contact with the bottom of
Table of Contents Feed for the Digital Edition of LCGC The Peak - April 2008 LCGC The Peak - April 2008 Contents LC3LC: Comprehensive Two-Dimensional Liquid Chromatography Split Injections in Gas Chromatography: How to Reduce Inlet Discrimination A Simple and Solvent-Free Method for Determining Tetracyclines in Prawns Industry News Events Education LCGC The Peak - April 2008 LCGC The Peak - April 2008 - LCGC The Peak - April 2008 (Page 1) LCGC The Peak - April 2008 - LCGC The Peak - April 2008 (Page 2) LCGC The Peak - April 2008 - LCGC The Peak - April 2008 (Page 3) LCGC The Peak - April 2008 - Contents (Page 4) LCGC The Peak - April 2008 - Contents (Page 5) LCGC The Peak - April 2008 - Contents (Page 6) LCGC The Peak - April 2008 - LC3LC: Comprehensive Two-Dimensional Liquid Chromatography (Page 7) LCGC The Peak - April 2008 - LC3LC: Comprehensive Two-Dimensional Liquid Chromatography (Page 8) LCGC The Peak - April 2008 - LC3LC: Comprehensive Two-Dimensional Liquid Chromatography (Page 9) LCGC The Peak - April 2008 - LC3LC: Comprehensive Two-Dimensional Liquid Chromatography (Page 10) LCGC The Peak - April 2008 - LC3LC: Comprehensive Two-Dimensional Liquid Chromatography (Page 11) LCGC The Peak - April 2008 - LC3LC: Comprehensive Two-Dimensional Liquid Chromatography (Page 12) LCGC The Peak - April 2008 - LC3LC: Comprehensive Two-Dimensional Liquid Chromatography (Page 13) LCGC The Peak - April 2008 - LC3LC: Comprehensive Two-Dimensional Liquid Chromatography (Page 14) LCGC The Peak - April 2008 - LC3LC: Comprehensive Two-Dimensional Liquid Chromatography (Page 15) LCGC The Peak - April 2008 - Split Injections in Gas Chromatography: How to Reduce Inlet Discrimination (Page 16) LCGC The Peak - April 2008 - Split Injections in Gas Chromatography: How to Reduce Inlet Discrimination (Page 17) LCGC The Peak - April 2008 - Split Injections in Gas Chromatography: How to Reduce Inlet Discrimination (Page 18) LCGC The Peak - April 2008 - Split Injections in Gas Chromatography: How to Reduce Inlet Discrimination (Page 19) LCGC The Peak - April 2008 - A Simple and Solvent-Free Method for Determining Tetracyclines in Prawns (Page 20) LCGC The Peak - April 2008 - A Simple and Solvent-Free Method for Determining Tetracyclines in Prawns (Page 21) LCGC The Peak - April 2008 - A Simple and Solvent-Free Method for Determining Tetracyclines in Prawns (Page 22) LCGC The Peak - April 2008 - A Simple and Solvent-Free Method for Determining Tetracyclines in Prawns (Page 23) LCGC The Peak - April 2008 - A Simple and Solvent-Free Method for Determining Tetracyclines in Prawns (Page 24) LCGC The Peak - April 2008 - A Simple and Solvent-Free Method for Determining Tetracyclines in Prawns (Page 25) LCGC The Peak - April 2008 - A Simple and Solvent-Free Method for Determining Tetracyclines in Prawns (Page 26) LCGC The Peak - April 2008 - Industry News (Page 27) LCGC The Peak - April 2008 - Events (Page 28) LCGC The Peak - April 2008 - Events (Page 29) LCGC The Peak - April 2008 - Education (Page 30) LCGC The Peak - April 2008 - Education (Page 31) LCGC The Peak - April 2008 - Education (Page 32)
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