Sample Recollection by the CDS 7550S Automated Thermal Desorber

Abstract

This application note demonstrates the quantitative recollection of split sample to a clean sample saver tube. This is demonstrated by different split percents on the CDS 7550S automated thermal desorber for a group of VOCs with boiling point up to 218 °C.

Introduction

Gas chromatography (GC) is an analytical technique by separating a mixture of compounds for a downstream detector to identify the chemical composition of each component. Direct liquid injection intot the GC inlet is the most common method of introducing sample onto the GC column. However, in many situations, the analyte identity, analyte concentration, or the matrix are not compatible for GC analysis. To tackle this challenge, various sample introduction techniques, including Purge and Trap, Thermal Desorption, Pyrolysis, and Solid Phase Micro Extraction were developed to introduce analyte onto the GC column to achieve the best separation result.