The Column - September 2007 - (Page 19)
September 2007 www.thecolumn.eu.com The Column Servos and Geissler Detecting Solvent Residues in Packaging Foils using Headspace GC 1Shimadzu Ulrich Servos1 and Margit Geissler,2 Deutschland GmbH, Duisburg, Germany, 2Shimadzu Europa GmbH, Duisburg, Germany. Headspace techniques can often replace time-consuming and complex sample pretreatment methods. This approach has been successfully applied to determine solvent residues in printed packaging foil. Headspace sampling set new standards for the gas chromatographic analysis of volatile compounds. The first headspace application was the determination of alcohol in blood. Gas-phase sampling led to lower sample contamination onto a separation column when compared with the injection of a liquid blood matrix. Many types of headspace autosamplers are currently available. They mainly differ from each other in the way that sample handling is performed. Generally, a part of the gas phase resulting from the incubation of a sample is transferred — via a gastight syringe, sample loop or constant pressure valve — from the sample vial to the gas chromatography (GC) system for separation and analysis. Consistent automation of the incubation and sampling steps is crucial to obtain reproducible analytical results. This technique is commonly used in polymer chemistry, pharmaceutical analysis and food technology. In many instances, headspace techniques are used to replace time-consuming and complex sample pretreatment procedures. The following application describes the determination of solvent residues in a printed packaging foil. Instrumentation A headspace sampler HT200H (HTA, Brescia, Italy) was used to apply the syringe technique, which can handle up to 40 headspace vials (10 mL or 20 mL vials with crimped aluminium Table 1: Results of solvent residue analysis with total evaporation method. Measuring value (mg) Measuring value 1 Measuring value 2 Measuring value 3 Measuring value 4 Mean value RSD (%) Ethanol 0.2485 0.2443 0.2470 0.2486 0.2471 0.8100 n-Propanol 0.0836 0.0821 0.0830 0.0835 0.0831 0.8300 i-Propanol 0.0413 0.0405 0.0410 0.0413 0.0410 0.9200 Ethyl acetate 0.4725 0.4637 0.4691 0.4712 0.4169 0.8300 Toluene 0.0091 0.0089 0.0090 0.0091 0.0090 1.0600 Authors: Ulrich Servos and Margit Geissler E-mail: info@shimadzu.de 19
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Table of Contents for the Digital Edition of The Column - September 2007
Contents
News
High-Speed Amino Acid Analysis of Beverages
Has Chromatography Been Helped by the Internet?
Market Trends and Analysis
Detecting Solvent Residues in Packaging Foils Using Headspace GC
ExTech 2007 Report
My Name Is Earl
The Column - September 2007
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