Intelligent Design Eliminates Potential Cross-Contamination in Gas Sorption Instruments
Intelligent design of vacuum systems permits the optimization of instrument performance and cost of on-board outgassing instruments. Potential sources of sample contamination and crosscontamination are reliably and consistently eliminated through the use of modern and patented vacuum system features. Standard features that ensure the absence of cross-contamination in gas sorption instruments designed with on-board outgassing units are described and include providing equivalent outgassing levels during sample treatment and analysis and achieving significant savings in equipment cost, bench space, and maintenance functions
Proper sample outgassing is an essential component of high-quality gas sorption analyses. The goal of sample degassing is to remove contaminants, mainly moisture and hydrocarbons, from solid surfaces prior to their analysis (Figure 1). Contaminants present during analyses could otherwise affect the access of adsorbents to the surface and pores of the solid. Outgassing can be accomplished using flow or vacuum methods. This report focuses on instrument design aspects necessary to eliminate the potential for sample contamination and cross-contamination during on-board vacuum outgassing.
Vacuum Outgassing Modes and Sources of Sample Contamination
Samples can be vacuum outgassed in three modes:
- Off-line, in independent outgassing units
- In-situ, by outgassing the sample in the analysis station itself
- On-board, sharing a common vacuum system for separate outgassing and analysis
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