INJECTORS
Heated Static Headspace Injector
Expected Performance
Columnoven temperatureprogram
(
Hdspace.tem
):
Initial
Hold Ramp Final
50
o
C 23.00 10.00 160
o
C
Sample:1µL100ppbBTEXPlus (vial 25% full of samplesolutionwith10µLof
100ppbBTEXPlus)VOAvial set toheat fromambient temperature to50
o
C
Column:15mMXT-VOL
Carrier:helium@10mL/min
BTEX sample results:
Component
Retention Area
Solvent
20.350 7332.0805
Benzene 21.483 266.2780
TCE
21.916 119.6645
Toluene
23.266 285.2310
PCE
24.216 98.6710
Ethyl Benzene 25.583 298.6540
Ortho Xylene 26.333 306.6115
Bromoform 26.616 24.4815
Total
8731.6720
FIDgain:HIGH
FID temp:300
o
C
FID ignitor: -400
Valve temp:120
o
C
Events:
Time Event
0.100 FON (VOAvial heater)
0.200 DON (shakersolenoid)
19.400 DOFF
19.500 FOFF
19.600 EON (purgegas)
19.700 EOFF
19.800 AON (sample loopexit
solenoid)
19.900 AOFF
20.000 GON (valveactuator)
27.000 GOFF
The following two
chromatograms were
producedinseriesbyanSRI
GC equippedwith a static
headspace injector and an
FID detector. The first
chromatogram isa100ppb
BTEXPlussample,and the
second is a water blank.
Bothwererununderidentical
conditions. Magnified for
visibility, the water blank
showsthecarryoverlevelof
the Headspace injection
system.
Water blank results:
Component
Retention Area
Solvent
20.350 137.0385
TCE
21.916 10.0770
Ortho Xylene 26.350 3.1305
Total
150.2460
(Note: this chromatogramwas generated in our
factory test lab, which has TCE contamination)
ThecarryoverppbofOrthoXylene isdetermined
by comparing the two resulting area counts:
