Figure3
Stabilityof sulfur compounds is
remarkable inSulfinert®-treated cylinders.
Sulfinert®-TreatedSwagelok®SampleCylinders
• Stable storage of sulfur compounds at ppb levels.
• D.O.T. rated to1800psi at room temperature.
• Highquality cylindersmanufacturedby Swagelok
®
.
Sulfinert
®
-treated gas sampling equipment is ideal for collecting and storing
samplescontainingppb levelsof sulfurcompounds, suchasnatural gasorbev-
erage-grade carbon dioxide. Sulfinert
®
treatment ensures that sulfur com-
pounds or other highly active compounds remain stable during transport
from the field to the laboratory. These cylinders are made from 304 grade
stainless steel with
1
/
4
" femaleNPT threads onboth ends.
Size
qty.
cat.#
75cc
ea.
24130
150cc
ea.
24131
300cc
ea.
24132
500cc
ea.
24133
1000cc
ea.
24134
2250cc
ea.
21394
■
Sulfinert
®
cylinder 3
●
Sulfinert
®
cylinder 2
▲
Sulfinert
®
cylinder 1
MethylMercaptan
120
100
80
0
0
10
20
30
40
50
60
●
▲
▲
■
■
time (hours)
recovery (%)
CarbonylSulfide
120
100
80
0
0
10
20
30
40
50
60
●
●
▲
▲
■
■
time (hours)
recovery (%)
HydrogenSulfide
120
100
80
0
10
20
30
40
50
60
●
●
▲
▲
■
time (hours)
recovery (%)
0
EthylMercaptan
120
100
80
0
0
10
20
30
40
50
60
●
▲
▲
■
time (hours)
recovery (%)
■
DimethylDisulfide
120
100
80
0
0
10
20
30
40
50
60
●
■
time (hours)
recovery (%)
▲
■
●
●
●
●
●
●
●
●
■
▲
Sulfinert®-TreatedRuptureDiscTee
2850psig rating, 1/4"NPT connections.
Description
qty.
cat.#
Sulfinert
®
RuptureDiscTee (
1
/
4
" NPT connections)
ea.
21396
Replacement RuptureDisc (not Sulfinert
®
-treated)
ea.
24298
CleaningSampleCylinders
Optimumperformance of Silcosteel
®
or Sulfinert
®
treated surfaces canbe
maintainedby cleaning themwith a varietyof neutral solvents.An increase
in surface activity,with the potential of physical damage to the coating, can
occur if the surface is exposed tooxygenated steam.Therefore,we donot
recommend exposing Silcosteel
®
or Sulfinert
®
treated surfaces to steam envi-
ronments in the presence of air or oxygen.However, Sulfinert
®
or Silcosteel
®
surfaces have been successfully cleanedusingnitrogen-enriched steam.
Sulfinert®-TreatedAlta-RobbinsSampleCylinderValves
• All wettedparts are Sulfinert
®
-treated for inertness.
• CompatiblewithSulfinert
®
-treated Swagelok
®
sample cylinders.
• Large, durable,Kel-F
®
seat ensures leak-free operation.
*Specify dip tube length or% outagewhen ordering (maximum length= 5.25"/ 13.3cm)
Description
qty.
cat.#
1
/
4
" NPT Exit
ea.
21400
1
/
4
" Compression Exit
ea.
21401
1
/
4
" NPTwithDipTube*
ea.
21402
1
/
4
" NPTwith 2850psi RuptureDisk
ea.
21403
Results
As shown inFigure 3, Sulfinert
®
-treated cylinders and accessorieswere inert
to reactive sulfur compounds over the 54-hour test period.Hydrogen sulfide
exhibited greater than85% recoveryover the test period;methylmercaptan,
ethylmercaptan, carbonyl sulfide, anddimethyl disulfide exhibited greater
than90% recovery.
Conclusion
This investigation confirms theuse of Sulfinert
®
-treated sample cylinders
and transfer lines greatly increases the storage time for reactive sulfur com-
pounds, ensuringmore accurate analyses.
Figure2
17ppbv sulfur standardsonan
Rtx®-1 columnwithSCDdetection.
1. hydrogen sulfide
2. carbonyl sulfide
3. methyl mercaptan
4. ethyl mercaptan
5. dimethyl sulfide
6. dimethyl disulfide
Column:
Rtx
®
-1 60m, 0.53mm ID, 7.0µm (cat.# 10193)
Oven temp.: 30°C (hold 1min.) to 180°C@ 10°C/min. (hold 5min.)
Carrier gas: helium
Flow rate:
8.5mL/min.
1
2
3
4
6
5
min.
5
GC_AR00477
