Method Classification
Chemical extraction techniques for gas chromatography-mass spectrometry isolate volatile and semi-volatile organic compounds from textile substrates to identify restricted substances. Performing a gc-ms extraction involves utilizing organic solvents under heat or agitation to draw synthetic finishes and contaminants from the yarn matrix. This step isolates the target compounds from the raw polymer.
Phase Separation
Liquid solvents such as dichloromethane or hexane penetrate the swollen fibre structure to dissolve plasticizers and residues. When the solvent interacts with the substrate, it draws out target analytes into the liquid phase. Gravity filtration then separates the extract from the solid textile debris, leaving a clear solution.
This solution undergoes concentration under a stream of nitrogen to increase the detection limit of the analytes.
System Protection
Analytical columns demand the absence of high-molecular-weight polymers to prevent irreversible contamination and signal drift. Refining the extract before analysis protects the injection port and column of the chromatograph from non-volatile polymers. This purification ensures consistent ionization and high resolution during mass analysis.
Compliance Standard
Restricted substance lists define the maximum allowable limits of chemical residues in finished garments. Standardized laboratory workflows measure the recovered compound concentrations against these regulatory thresholds. Accurate quantification protects consumer health and verifies that mill finishes comply with global eco-labels.
