| 007-5MS |
|
| Silphenylene Polysiloxane |
Traditional
polysiloxane-type GC stationary phases degrade at
elevated temperatures. The degradation process is
well documented and consists of the thermal rearrangement
of the siloxane backbone to produce cyclic groups. These
groups are volatile and elute from the column as column
'bleed'. The silphenylene units (Fig. 1) within the
007-5MS backbone act as heat sinks and limit the
formation of the cyclic groups normally associated with
polysiloxane degradation.
Figure 1,
Silphenylene/polysilxane phase unit.
The 007-5MS
silphenylene columns offer the chromatographer a
number of advantages:
greater
thermal stability
greater
resistance to oxygen degradation
fast ramping
to elevated temperatures to purge the
column of residual components
improved
analysis of trace level compounds
less baseline
bleed equals less baseline noise, which
results in lower detection limits
increased
column lifetimes
reduced
contamination of MS sources and other GC
detector surfaces
"cleaner"
mass spectra...mass spectra with fewer
extraneous ions enables the analyst to
achieve more accurate compound
identification and a more efficient
library search
Figure 2 - 007-5MS Silphenylene Baseline Bleed
|
| A typical 007-5MS
baseline bleed is shown above in Figure 2. The
mass spectrum of the baseline bleed is shown below in
Figure 3. |
Figure 3 - 007-5MS Silphenylene Mass Spectrum
Note the low abundance of key ions.
|
| While a typical
methylpolysiloxane bleed spectrum shown below in Figure 4. yields high
abundance's of ions with m/z 207, 281, 355, the mass spectrum of the 007-5MS silphenylene
column (above, Fig. 3.) yields significantly lower
abundance of these ions. Additionally, it
is apparent from Figure 3 that there is a
reduction in the total number of ions resulting
in "cleaner" spectrum and less
background interference. |
Figure 4 -
Typical Methylpolysiloxane Mass Spectrum
|
|
007-5MS
AVAILABLE COLUMN CONFIGURATIONS
|
| I.D. (mm) |
Lengths (Meters) |
Films (microns) |
| 0.10 |
10,
15, 20, 25, 30 |
0.1,
0.25, 0.5 |
| 0.18 |
10,
15, 20, 25, 30 |
0.1,
0.25, 0.5 |
| 0.25 |
15,
25, 30, 50, 60 |
0.1,
0.25, 0.5, 1.0 |
| 0.32 |
10,
15, 25, 30, 50, 60 |
0.1,
0.25, 0.5, 1.0 |
| 0.53 |
10,
15, 25, 30 |
0.1,
0.25, 0.5, 1.0 |
|
We have now added our
complete fused silica and Ultra-ALLOY stainless steel
column price lists. The lists are sorted by I.D. then
column length. You can CLICK HERE to go directly to column pricing, or can
link to the pricing pages on the individual column
information pages.
Click HERE to go directly to the 007-1 price page.
The columns listed are
those that are commonly requested by our customers. If
you do not see the column configuration you require,
CONTACT US, we will be happy to quote.
|
007-5MS
OPERATING TEMPERATURE RANGE |
| Film
Thickness |
Temperature
Range - Programmed |
| 0.1 - 1.0um
|
-50oC
to 350oC |
|
BONDED
PHASE RETENTION INDEX |
| Phase |
benzene |
1-nitropropane |
2-pentanone |
pyridine |
butanol |
| 007-5MS
|
665.62 |
751.12 |
689.59 |
756.23 |
662.46 |
| 007-5MS
TYPICAL
TEST MIX DATA |
Column:
007-5MS, Silphenylene Siloxane
30M. x 0.25mm I.D. x 0.5um film
Cat. No.:
007-5MS-30-0.5F
|
Temperature:
115oC Isothermal
Injector: 225oC
Detector: MSD, 300oC
Transfer Line
Carrier Gas: 26 cm/sec., Helium |
|
|
Elution
Order: |
| 1. C10 |
4. 2,6-dimethylphenol |
|
2. octanol |
5. 2,4-dimethylaniline |
|
3. C8 FAME |
6. naphthalene |
|
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|
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