Our 20-page technical guide describes the
components of a passive sampling train, and
presents procedures for sampling, for cleaning,
and for certifying the sampling train and canister.
Request lit. cat.#59977A.
• 13 •
2003
Volume 3
800-356-1688
SilcoCan
™
Canisters
Ideal for Low-Level (1ppb-20ppb)
Reactive Sulfur Compounds
Reference
1
Stability studyof Low-Level (1ppb-20ppb)Reactive Sulfurs in SilcoCan
™
Canisters.
RestekCorporation, 2001.
Availableon request: lit. cat.#59347.
SilcoCan
™
Air SamplingCanisters
SilcoCan
™
Canisterswith
Vacuum/PressureGauge
volume
qty.
cat.#
1L
ea.
24112
3L
ea.
24113
6L
ea.
24114
15L
ea.
24115
Feature
High-purity,
2
⁄
3
-turn valvewith stainless steel valve diaphragms.
Vacuum/pressure gauge (optional).
Variety of sizes.
Temperature stability to250°C.
Silcosteel
®
valve available (add suffix “-650” to cat. #).
No sample adsorption, formore accurate results; easy touse.
Silcosteel
®
coated.
Inert surface, ideal for containing low-level sulfur compounds.
Indicates internal conditions.
Meet extensive range of samplingneeds.
Canbe cleaned at higher temperature, producing a cleaner can.
Completely passive sample pathway ensures sample stability.
Analysis of low-level sulfur volatile organic com-
pounds (VOCs), such as hydrogen sulfide (H
2
S),
methyl mercaptan (CH
3
SH), ethyl mercaptan
(C
2
H
5
SH), and dimethyl disulfide (CH
3
SSCH
3
) is
important because of health concerns and odor
complaints nearmanufacturing sites and refineries.
Collection andmeasurement of these compounds in
the atmosphere is very difficult because of their low
concentrations and high reactivity. Sulfur VOCs can
react not only with each other, but alsowith the
Benefit
vessels inwhich they are collected. This causes low
recoveries. SilcoCan
™
airmonitoring canisters,
which feature a Silcosteel
®
-treated surface, ensure
stability of low-level sulfur VOCs.
We evaluated the stability of sulfur VOCs in
SilcoCan
™
canisters at very low levels (1–20ppbv)
for six days.
1
Comparison of dry vs. humidified
standards demonstrates the ability of SilcoCan
™
canisters to store low-level sulfur VOCs in real-world
conditions (Figure 1). Electropolished canisters
allowed rapid degradation of hydrogen sulfide,
methyl mercaptan, and ethyl mercaptan during a
similar study.
When you need to perform sensitive airmonitoring
analyses for sulfur VOCs, use SilcoCan
™
canisters to
collect and store your samples.
Rtx
®
-1, 60m, 0.53mm ID, 7.0µm (cat.# 10193)
GC:
Agilent 5890GC
Det.:
SieversModel 355 SCD
Oven Temp.:
30°C (hold 1.0min.) to
180°C@ 10°C/min. (hold 5min.)
FlowRate:
8.5mL/min.
Sample:
1mL (sample loop)
Standards: 2mL of 100ppm stock sulfur standard added to each precleaned and evacuated canister, then pressurized to 30psigwith ultra-pure nitrogen.
The resultant concentrations are listed in Applications Note #59347. Humidified standardsmade by injecting evacuated canisters with 100µL of deionized
water prior to adding 2mL aliquot of stock standard (50%RH).
Dry SilcoCan
™
(n=18)
HumidifiedSilcoCan
™
(n=5)
Electropolished canister (n=2)
●
◆
▲
Figure1
- SilcoCan
™
canisters effectively store low-level organic sulfur compounds under real-world conditions.
Time (Days)
Time (Days)
Percent Recovery
Percent Recovery
2
H S
1L
ea.
24116
3L
ea.
24117
6L
ea.
24118
15L
ea.
24119
By Donna Lidgett, Air Sampling ProductsMarketingManager
✔
Stable, long-term storage of sulfur volatile organic compounds.
✔
More accurate data thanwith electropolished canisters.
Percent Recovery
Time (Days)
