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Environmental Reference Standards
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Method 532 (Phenylurea Pesticides)
Hydroguard® MXT® Guard/Retention Gap Columns/Transfer Lines
Use guard columns to:
• Reduce effects of dirty samples on column performance.
• Reduce downtime and maintenance.
Diameters greater than 0.10mm are tested with the Grob test mix to ensure high inertness.
- Extend analytical column lifetime by preventing degradation by harsh “steam-cleaning” water injections.
- Maximum temperature: 430°C.
When transfer lines from purge & trap systems, air monitoring equipment, or other instruments carry condensed water vapor, deactivated column tubing quickly becomes active because of the creation of free silanol groups. These silanol groups adsorb active oxygenated compounds such as alcohols and diols.
Restek chemists have addressed this concern and found a solution--the Hydroguard® deactivation process. A unique deactivation chemistry creates a high-density surface that is not readily attacked by aggressive hydrolysis. The high-density surface coverage of the Hydroguard® deactivation layer effectively prevents water vapor from reaching the fused silica surface beneath. Use Hydroguard® tubing for connecting GCs to:
• Purge & trap systems.
• Headspace analyzers.
• Air analysis equipment and concentrator units.
*30- and 60-meter lengths are banded in 5-meter sections.
†Recommendation: Cut 60m guard columns into shorter lengths. Using full length may cause peak distortion.
