• 9 •
Rtx®-624Columns (fusedsilica)
(Crossbond
®
6% cyanopropylphenyl/94% dimethyl polysiloxane)
benzene
bromodichloromethane
bromoform
carbon tetrachloride
chlorobenzene
2-chloroethyl vinyl ether
chloroform
dibromochloromethane
1,2-dichlorobenzene
1,3-dichlorobenzene
1,4-dichlorobenzene
1,1-dichloroethane
1,2-dichloroethane
1,1-dichloroethylene
trans
-1,2-dichloroethylene
1,2-dichloropropane
cis
-1,3-dichloropropylene
trans
-1,3-dichloropropylene
ethylbenzene
methylene chloride
(dichloromethane)
1,1,2,2-tetrachloroethane
tetrachloroethylene
toluene
1,1,1-trichloroethane
1,1,2-trichloroethane
trichloroethylene
VolatilesMegaMix™,
EPAMethod624
(26components)
2,000µg/mL each in P&Tmethanol, 1mL/ampul
Each
5-pk.
10-pk.
30497
30497-510
—
w/data pack
30497-500
30497-520
30597
bromomethane
chloroethane
chloromethane
trichlorofluoromethane
vinyl chloride
2,000µg/mL each in P&Tmethanol, 1mL/ampul
Each
5-pk.
10-pk.
30020
30020-510
—
w/data pack
30020-500
30020-520
30120
4-bromofluorobenzene
fluorobenzene
pentafluorobenzene
624SurrogateStandardMix
2,000µg/mL each in P&Tmethanol, 1mL/ampul
Each
5-pk.
10-pk.
30243
30243-510
—
w/data pack
30243-500
30243-520
30343
1,500µg/mL each in P&Tmethanol, 1mL/ampul
Each
5-pk.
10-pk.
30023
30023-510
—
w/data pack
30023-500
30023-520
30123
MegaMix™ReferenceMixes
ForUSEPAMethods
Volatiles: 524.2, 624, 8260,
OLC03.2,OLM04.2, 502.2
Semivolatiles: 525.2, 625, 8270,
OLC03.2,OLM04.2
mix
it
up!
Restek’s
MegaMix
™
Standards
✔
Fewest mixes needed for calibration ormatrix spike
✔
Maximum stability
✔
Most commonly analyzed compounds:
• 8260—76 volatile compounds in 1mix
gases and ketones in separatemixes, formaximum stability
• 8270—76 semivolatile compounds in 1mix
• Appendix IX—59 semivolatile compounds in 3mixes
• 524—73 volatile compounds in 1mix
• 525—90 semivolatile compounds in 5mixes
• 625—54 semivolatile compounds in 1mix
• CLP 03.2 (volatiles and semivolatiles)
• CLP 04.2 (volatiles and semivolatiles)
Fordetails, visitourwebsiteatwww.restekcorp.com
Our referencematerials for themethod include the
recommended surrogates (cat.# 30243). The
method also requires 3 ormore internal standards
that are similar in analytical behavior to the target
compounds. Our internal standardmix (cat.#
30023) includes recommended compounds and sat-
isfies this requirement.
Based on a cyanopropylphenyl/dimethyl polysiloxane
phase, our Rtx
®
-624 column has unique polarity,
and provides excellent separation of the target com-
pounds. By using a short, narrow bore column
(40m x 0.18mm ID, 1.0µm phase)we reduced
analyses time and improved resolution. This particu-
lar column configuration also eliminates non-target
interferencewith target compounds. Figure 1 shows
an analyses of all Method 624 target compounds on
a 40m x 0.18mm IDRtx
®
-624 column. Total cycle
time is 17minutes, whichmatches the cycle time for
the purge and trap concentrator.
By using a 40m x 0.18mm ID, 1.0µmRtx
®
-624 col-
umn andRestek’s convenient, carefully formulated
referencematerials, you can obtain rapid analyses
and accurate data. These practical advantagesmake
Restek the best source formaterials for EPAMethod
624, and for wastewater volatiles analyses in general.
624CalibrationMix#1
bromochloromethane
2-bromo-1-chloropropane
1,4-dichlorobutane
624 InternalStandardMix
Stabilityof 2-Chloroethyl vinyl ether
2-Chloroethyl vinyl ether is stable in neutral pH and in slightly basic solutions. If the solution is slightly acidic, the
analytewill rapidly decompose. Restek specially prepares stable individual solutions of 2-chloroethyl vinyl ether in
neutral purge and trapmethanol.These solutions are very stable and can be dilutedwithout problems, using pure,
neutral, P&T grademethanol. Be careful when combining these solutionswith other calibrationmaterials - some
solutions can contain trace acidic impurities that will cause rapid decomposition of 2-chloroethyl vinyl ether. Be
especially cautious of calibrationmixtures that contain high concentrations or a large number of chlorinated target
compounds; these oftenwill contain sufficient traceHCl to cause stability problemswith 2-chloroethyl vinyl ether.
Tech
Tip
!
HOT
ID df (µm)
temp. limits
20-Meter
40-Meter
0.18mm 1.00 -20 to 240°C
40924
40925
ID df (µm)
temp. limits
30-Meter
60-Meter
75-Meter
105-Meter
0.25mm 1.40
-20 to 240°C 10968
10969
0.32mm 1.80
-20 to 240°C 10970
10972
0.45mm 2.55
-20 to 240°C
10982
0.53mm 3.00
-20 to 240°C 10971
10973
10974
10975
