Introduction
Achieving optimal sensitivity in GC/MS analysis requires careful attention to potential sources of contamination throughout the analytical workflow. This application note outlines best practices for minimizing background interference when working with trace-level analysis.
Common Sources of Contamination
Understanding where contamination originates is the first step in eliminating it:
- Vial and closure manufacturing residues
- Septa bleed and outgassing
- Sample preparation reagents
- Environmental contamination during handling
Best Practices for Vial Selection
Choose ultra-clean certified vials specifically designed for GC/MS applications. Look for products that have been tested and certified for low extractables and leachables. NOKE LAB Ultra-Clean vials undergo multi-stage cleaning processes to minimize background interference.
Septa Considerations
Select low-bleed septa materials appropriate for your temperature range. Pre-condition septa when working at elevated temperatures. Consider bonded cap technology to eliminate adhesive-related contamination.
Conclusion
By implementing these best practices and selecting appropriate consumables, laboratories can achieve consistently lower backgrounds and improved detection limits in their GC/MS workflows.
