• Extremely lowbleed, ideal for high-sensitivityGC/MS (stable to340oC).
• Excellent resolution for semivolatile compounds inwater, including envi-
ronmental pollutants - pesticides - PCBs.
• Proprietary low-polarityphase, similar toDB®-XLB.
Compared to columns produced througholder synthesis technologies, ultra-
low-bleedRtx®-XLB columns help ensure better detection limits and greater
instrument stability in semivolatiles analysis. If noisy baselines are keeping
you from taking full advantage of your high sensitivity system, or if semi-
volatile analytes are causing detectionor resolutiondifficulties, anRtx®-XLB
column is your best choice for solving the problem.
MaximizePerformance fromHigh-SensitivityGC/MSSystems
Recent improvements toGC/MS systemsdesignhavegreatly increased instru-
ment sensitivity.Consequently,columnbleed levels that formerlywereaccept-
able now oftenprevent an analyst from taking full advantage of the capabili-
ties of the system.
To address the growing need for ultra-low-bleed columns, Restek has devel-
opedRtx®-XLB columns.Throughanewapproach topolymer synthesis, and
state-of-the-art tubing deactivation, these columns minimize interference
withhigh temperature analyses of highmolecular weight active compounds:
our bleed specification forRtx®-XLB columns is less than6pA at 340
º
C!
Figure1 shows thebleed fromanRtx®-XLBcolumnat 330
º
C, theending tem-
perature in US EPA Method 525 analysis of semivolatile pollutants, as
observed with anAgilent 6890/5973 GC/MS. Clearly, column bleed is not a
factor in this analysis.
Rtx®-XLB 30m, 0.25mm ID, 0.25µm (cat.# 12823)
Sample:
US EPAMethod 525 standards, 1µL, 2.5ng per analyte on-column
See Figure 2 for conditions.
111
112
113
114
115
116,117
118
Ultra-Low-BleedRtx®-XLBColumns
Figure1
AnRtx®-XLB columnexhibits less than6pAbleed—
evenat 330°C.
