595
GC CHROMATOGRAMS |
ENVIRONMENTAL
Gasol ine Range Organics (GRO)
Volatile Petroleum Hydrocarbons (VPH)
Massachusetts Department of Environmental Protection
Rtx®-502.2
PID
min.
4
8
12
16
20
24
28
32
1. methanol
2. methyl
tert
-butyl ether (60ng)
3. benzene (20ng)
4. toluene
5. ethylbenzene (20ng)
6.
p
+
m
-xylene (40ng ea.)
7.
o
-xylene (40ng)
8. 1,2,4-trimethylbenzene (40ng)
9. naphthalene (40ng)
10. 2,5-dibromotoluene (SS)
2
1
3
4
5
6
7
8
9
10
Column:
Rtx
®
-502.2, 105m, 0.53mm ID, 3.0µm (cat.# 10910)
Conc.:
on-column at levels listed
Oven temp:
45°C to 90°C @ 3°C/min., to 140° @ 5°C/min.,
to 230°C @ 45°C/min. (hold 8 min.)
Carrier gas:
helium @ 15mL/min. Tekmar Model LSC 2000
Trap:
BTEX
Purge:
helium @ 40mL/min. for 11 min.
Dry purge:
2 min.
Desorb preheat:
245°C
Desorb:
2 min. @ 250°C
Bake:
6 min. @ 260°C
Chromatograms courtesy of Severn Trent Laboratories, Burlington, VT.
1. methanol
2.
n
-pentane (40ng)
3. 2-methylpentane (60ng)
4. methyl
tert
-butyl ether (60ng)
5. 2,2,4-trimethylpentane (60ng)
6. benzene (20ng)
7. toluene (60ng)
8.
n
-nonane (40ng)
9. ethylbenzene (20ng)
10.
p
+
m
-xylene (40ng ea.)
11.
o
-xylene (40ng)
12. 1,2,4-trimethylbenzene (40ng)
13. naphthalene (40ng)
14. 2,5-dibromotoluene (SS)
FID
GC_EV00063
For VPH analysis on an Rtx®-502.2 column, use PID for aromatic
compounds and FID for aliphatic compounds.
2
1
3
4
5
6
7
8 9
10
11
12
13
14
min.
4
8
12
16
20
24
28
32
free
literature
Optimizing Massachusetts Volatile Petroleum
Hydrocarbon GC Analysis
Massachusetts VPH affords more reliable quantification
of volatile petroleum hydrocarbons, relative to older
“analytical window”methods, and has been adopted
by other states and in Canada. This 2-page note offers
valuable tips for selecting a trap and a capillary GC
column compatible with the methodology. Reference
mixes specifically designed for MA VPH are described.
Download your free copy from
Applications Note
lit. cat.# 59150
Website :
E-mail :
TelNo : 03 9762 2034 . . . in AUSTRALIA
Mar 2011
