ethylene oxide plus solvents: an application note
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7/28/2019 Ethylene Oxide plus solvents: An Application Note
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PID GC-301C APPLICATION NOTE #102: ETHYLENE
OXIDE + SOLVENTS May 20101
GC-301C
Application
Note #102
Ethylene Oxide
+ solvents
ETHYLENE OXIDE @ PPB LEVELS IN THE PRESENCE OF 1,000 PPM SOLVENTS FACEBOOK.COM/PIDANALYZERS
This application note concerns the
detection of ethylene oxide in workplace
atmospheres where a number of gases &
solvents coexist. The OSHA Permissible
Exposure Limit (PEL) for ethylene oxide
(ETO) is 1.0 ppm since ETO may causecancer. The recommended method for
ETO is Gas Chromatography
(GC)/Photoionization Detector (PID)
(OSHA Method 1910.1047 App D).
This was a manufacturing application
where more than 25 solvents were
present including alcohols, ketones,
aldehydes, aliphatic and aromatic
hydrocarbons. We tested the 301C GC
with a PID (10.6 eV) with solvents > 100
times the ETO concentration. With our
normal pre column, we could separatemany of the solvents. Fig. 1 is the
chromatogram for ETO (30M x 0.32
mmm capillary column) with 1,000 ppm
ethanol and 10 ppm ETO with our
normal precolumn. Note that ETO and
ethanol are separated but the ethanol
peak is off scale. With our novel
precolumn, shown in Fig. 2, the
ethanol peak is
totally eliminated. None of the other
solvents tested produced any peaks but
several had impurity peaks that were
resolved by the analytical column.
After the injection, the precolumn wasbackflushed to prevent any high MW
peaks from interfering with the next run.
The Peak Works software has a
programmable sample ahead feature
that starts sampling the next point as
soon as the sample is injected on the
column. This means that the analytical
time is the time per point.
All of the data including the
chromatogram is saved on an 8 GByte
memory stick. For more info, see the
GC301C brochure.
Fig. 1 ETO and 1,000 ppm Ethanol with
normal + special precolumns
The lower chromatogram is 10 ppm ETO
1,000 ppm Ethanol. Note that the large p
is well separated from the ETO but with
special precolumn (upper) the 1000 ppmblocked from the analytical column an
there are no peaks from the solvent.
Written by: Dr. Jack Driscoll, PID Analyzers, LLC, 2 Washington Circle, Sandwich, MA 02563 T: 774 413 5281