Restek ESSENTIALS 2010-2012 - page 11

UsingLargeVolume
Injection inanUnmodified
SplitlessGC Inlet
go to www.restek.com/gc formoregreat applications 10
Rxi®-624SilMSColumns (fused silica) (midpolarityCrossbond®
silarylenephase; similar to6%cyanopropylphenyl/94%dimethyl polysiloxane)
Description temp. limits qty. cat.#
30m,0.25mm ID, 1.40μm -20 to300/320 °C ea. 13868
Rxi®Guard/RetentionGapColumns (fused silica)
Description ea. 6-pk.
5m,0.25mm ID,0.37±0.04mmOD 10029 10029-600
10m,0.25mm ID,0.37±0.04mmOD 10059 10059-600
Sky®4.0mm IDSingleTaper InletLiner w/Wool
IDxODxLength ea. 5-pk. 25pk.
4.0mmx6.5mmx78.5mm 23303.1 23303.5 23303.25
ForAgilentGCsequippedwith split/splitless inlets
EZTwistTop®Split/Splitless InjectionPort forAgilent 7890GCs
Description kit
InjectionPortAssemblyKit,SiltekTreated
Includes: Siltekweldment, Siltekshellweldment, 2weldmentO-rings, SiltekDualVespelRing inlet seal, septum
nut, reducingnut, stainlesssteel capillarynut forusewith 1/16" ferrules, andweldment removal tool
22178
All cartridgesaremanufacturedusinghighdensitypolypropyleneandhavepolyethylene fritsunlessotherwisenoted.Cartridges
maybeprocessedbyanyoneorall of these techniques:positivepressure, sidearmflask, centrifuge, orvacuummanifold.
SPECartridges
Description TubeVolume,BedWeight qty. cat.#
EPAMethods521&522
Activatedcharcoal packing. 6mL, 2g 30-pk. 26032
• Newsolution fromRestekoffersnear100% recovery
of1,4-dioxane indrinkingwater.
• Reliablydetects1,4-dioxanewellbelowEPA
suggested reporting levels.
• Requiresnospecializedequipmentor changes
tostandard laboratory instrumentation.
LowerDetection
Limitsof
1,4-Dioxane in
DrinkingWater
ByChrisRattray, JackCochran, andChrisEnglish
Abstract
Concurrent solvent recondensation–
large volume splitless injection (CSR-
LVSI) for gas chromatography typically
requires a special injection port such as
a programmable temperature vaporizer
(PTV).The techniquedescribedhere for
the analysis of 1,4-dioxane in drinking
water uses an unmodified split/splitless
inlet with CSR-LVSI to lower reporting
limitswithout concentrating the extract.
This CSR-LVSI technique improves de-
tectability with no specialized equip-
ment or changes to standard laboratory
instrumentation.
Conclusion
Concurrent solvent recondensation–
large volume splitless injection with an
unmodifiedAgilent split/splitlessGC in-
lethasbeen shown tobea technicallyvi-
able approachwith potential advantages
for EPA Method 522 dioxane analysis.
The solvent recondensation focuses the
solutes into a tight band on the column,
which improves chromatography. At the
same time, this technique increases the
amount of analyte transferred to the col-
umn. Using CSR-LVSI with a standard
inlet, as shown here, provides a cost-ef-
fective way tomeet ever decreasing de-
tection andquantitation limits.
ReferenceStandards:USEPAMethods
Standards
Conc. InSolventandVolume: Tetrahydrofuran-d8 1,4-Dioxane-d8 1,4-Dioxane
2,000μg/mL inP&Tmethanol, 1mL/ampul 30112 (ea.) 30614 (ea.) 30287 (ea.)
Also, visit www.restek.com/press-tight
forUniversal Press-Tight®Connectorsand
www.restek.com/flip f or FlipSeal™ Inlet Seals
Visit
www.restek.com/dioxa ne
to read thecomplete
applicationnote!
OurCSR-LVSIworkbuildsonworkbychemistsatThermoScientific (P.Magni,
T. Porzano,ConcurrentSolventRecondensationLargeSampleVolume
Splitless Injection, J. Sep. Sci. 26 (2003)1491). PatentNo:US6,955,709B2.