Rtx-5MS Cat#s : Rtx-5SIL MS Cat#s

GC/MS Grade columns are specifically designed for the ultimate GC performance !

• to minimise column bleed - more attention is given to effective cross-linking of bondedd liquid phases for increased stability at high column temperatures.

• MS is more senstive to bleed with spurious peaks often confusing MS spectra and compound indentification at high sensitivity / detection limits- high temperature phases help to clean up the system by bakingthe column out in between GC runs.

• Effective column deactivation is essential so peaks are not changed during the chromatography causing misidentification.

GC/MS Columns - low bleed - high max temperature use - small ID,  thin film
 5% phenyl siloxane type is the most universally used column and the column phase of "first choice" for many sample "screening" applications

Rtx-5 MS Rtx-5 MS
see comparison of bleed on different columns pic

Every Column manufacturer claims to have the lowest bleed capillary column for GC/MS.
Restek claims to be the "low bleed leader in GC/MS with the Rtx-5MS column introduced in 1996 an extension of technology used in the Restek XTI-5 range - they also offer proof and guarantee the performance !

Rtx-5Sil MS Rtx-5Sil MS these are "state-of-the-art columns bar NONE !

In 2000 Restek released an even more improved GC/MS column
 Rtx-5Sil MS column utilising an improved silarylene polymer
almost identical selectivity to standard DB5 MS, HP-5TA etc

these columns are rated for use at column temperatures up to 360 degC

Both Rtx-5 MS and Rtx-5Sil MS are ideal general purpose GC/MS columns suitable for a wide range of applications; semi-volatiles, acidic, basic and neutral compounds from solid wastes, soils, water or air ranging in polarity from chlorophenols to high boiling PAHs
- these columns are optimised for GC/MS applications - Read about them ! Try them out !

Other GC/MS Columns . . .

Stx-1HT
Stx-1 Column

for even higher temperature applications Restek has released (2001) a new high temperature low bleed column

• 380 degC column ( <10pa on an FID at 380deg-C

• Siltek deactivated for enhanced inertness

• dimethyl siloxane polarity ie similar to Rtx-1, BP-1 etc

• uses rugged high temperature tubing with high temp polyimide coating

see also Restek 2001 catalog for other MS grade columns 22-23

Rtx-1 MS, Rtx-35 MS, Rtx-200 MS

Restek also are innovative and specialise in optimising columns for GC/MS applications
RTX-VMS Rtx-VMS for analysis of Volatiles

ValcoBond MS Grade Columns
 

VB-1, VB-5, VB-35, VB-50
GUARANTEED at about 2/3 the list price of other similar columns

GC/MS Innovations

Integra-Guard
Intregra Guard
Integra

Many practical chromatographers particularly GC/MS use Guard Columns or "retention gaps" ie uncoated section of column connected to the main column to minimise effects of dirty sample, solvent shock on the front of the column
The Integra-Guard columns is an integral uncoated section of the main column and avoids the need for potentially troublesome connectors which may tend to leak air and need to be conditioned to "glue-in" the standard Presstight connedctors

Siltek Deactivation
Siltek
see article on Minimize Breakdown of Chlorinated Pesticides RtxADV-Sprg-4

Don't forget ! - even with the best of columns - the inertness of the injection system and liners/glass wool (if used) is equally important
Siltek is the ultimate deactivation technique for glass liners and glass wool.
For ultimate inertness of the GC/MS Silcosteel-treatment ofinjection port and HP inlet seals is also recommended. Silcosteel MS interface lines are also popular

Are you sick of changing columns in your GC/MS and the down-time involved ?
Restek has the answer - ez-VENT2000 interface simplifies the task

"popular" GC/MS Columns

Restek 30m 0.25mm 0.25um
Rtx-5 MS  #12623
w/ 5m Integra-Guard #12623-124
Rtx-5Sil MS 12723
w/ 5m Integra-Guard #12723-124
10m Integra-Guard use suffix -127
Rtx-XLB 20m 0.18mm ID 0.18um #42802
Fast Sensitive Analysis of Semivolatiles in Water
Adv 2004

ValcoBond VB-1 30m 0.25mm 0.25um
#CFS-BO3025-025B

• NEW 2004 Uni-Molecular VB-1 VB-1 UniMol

• Ultra Low Bleed 380 deg-C 5pA

• New Metal columns to 450 deg-C

Why 0.25mm columns ? - these are a reasonable compromise for pressure drop and column efficiency
0.25um ? -  thin film 0.25um and small ID minimise flow rates and help reduce column bleed

• 30m length - are generally satisfactory if the column outler is at approx atmospheric pressure ie with a jet seperator or interface device such as the Restek ez-VENT 2000.

• 60m - are preferred for direct insertion of the column into the ion source - 10 to 25% of the column is then under partial vacuum and non-ideal chromatography conditions

GC/MS Parts - HP/Agilent MSD GC-MS Parts

• MSD Conversion Fitting -.Improved version

• MSD Source Nut - standard

• Channeltron 5778 Electron Multiplier for Agilent 5971A, 5972A MSD and GCD

• ez-VENT GC - GC/MS Interface for quick interchange of columns without MS downtime

  Restek GC/MS Grade Columns

IMPORTANT
Testing GC Columns for GC/MS AppNote 3p
Low Bleed : GC/MS System MUST be free of air leaks

 Rtx-5Sil MS :Improving throughput of semivolatile GC/MS analysis DJVu AppNote #59125
Technical Guide to Preparing & Analysing Semivolatiles #59411
Monitoring Volatile Compounds in Food Contact Packaging Using P&T GC/MS and Rtx-5MS Capillary Columns #59348
PRES -Fast Analysis of Semivolatiles : US EPA 8270
Fast Sensitive Analysis of Semivolatiles in Water Adv 2004

Introducing Rtx5-Sil MS
DJVu 4p

the Most Universlly Popular Phase - for most applications

2005 Brochure DJVu
enhanced 4p DJVu

But What's happened to J&W and their DB-5MS ?
Well J&W has been taken over by HP who sold off their Instrument Division to Agilent
Rob Woelab the "technical" brains behind J&W ie the W of J&W has gone .
He has set up ValcoBond under VICI-Valco Corp
These ValcoBond columns are DIRECT EQUIVALENTs to J&W columns
 - the technology IS identical ! see ValcoBond Web Section
Chromalytic Technology is proud to also be distributors for ValcoBond

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