Chemical Analysis
Analytical protocols for identifying volatile and semi-volatile organic compounds provide a baseline for chemical safety in textile finishing. Use of gc-ms screening allows laboratories to separate complex mixtures into individual components through gas chromatography before identifying them with mass spectrometry. This process detects plasticizers, solvents, pesticides, and flame retardants that may remain after fabric processing.
Instrumental Operation
Gas chromatography separates vaporized components based on their affinity for a stationary phase within a column. Once separated, the molecules enter a mass spectrometer where they are fragmented by electron impact and identified by their unique mass-to-charge ratios. The gc-ms screening identifies substances like ortho-phthalates or residual organic solvents at parts per million levels.
A carrier gas moves the sample through the system at a controlled flow rate to ensure precise retention times. This precision allows for the identification of trace impurities that might otherwise go unnoticed.
Detection Range
Qualitative identification relies on comparing the resulting spectra against established libraries containing thousands of chemical signatures. While quantitative gc-ms screening determines the exact concentration of a substance, its primary strength lies in discovering unknown contaminants. This makes it a standard tool for restricted substance list audits.
Boundary Condition
Volatile substances that do not degrade at high temperatures are the only candidates for this method. Compounds with high molecular weights or those that are thermally unstable require liquid chromatography instead of gc-ms screening to avoid sample breakdown.
