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Rtx®-624 Columns (fused silica)
(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
Volatiles MegaMix™,
EPA Method 624 (26 components)
2,000µg/mL each in P&T methanol, 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&T methanol, 1mL/ampul
Each 5-pk. 10-pk.
30020 30020-510 —
w/data pack
30020-500 30020-520 30120
4-bromofluorobenzene
fluorobenzene
pentafluorobenzene
624 Surrogate Standard Mix
2,000µg/mL each in P&T methanol, 1mL/ampul
Each 5-pk. 10-pk.
30243 30243-510 —
w/data pack
30243-500 30243-520 30343
1,500µg/mL each in P&T methanol, 1mL/ampul
Each 5-pk. 10-pk.
30023 30023-510 —
w/data pack
30023-500 30023-520 30123
MegaMix™ Reference Mixes
For US EPA Methods
Volatiles: 524.2, 624, 8260,
OLC 03.2, OLM 04.2, 502.2
Semivolatiles: 525.2, 625, 8270,
OLC 03.2, OLM 04.2
mixitup! Restek’s
MegaMix™
Standards
✔ Fewest mixes needed for calibration or matrix spike
✔ Maximum stability
✔ Most commonly analyzed compounds:
• 8260—76 volatile compounds in 1 mix
gases and ketones in separate mixes, for maximum stability
• 8270—76 semivolatile compounds in 1 mix
• Appendix IX—59 semivolatile compounds in 3 mixes
• 524—73 volatile compounds in 1 mix
• 525—90 semivolatile compounds in 5 mixes
• 625—54 semivolatile compounds in 1 mix
• CLP 03.2 (volatiles and semivolatiles)
• CLP 04.2 (volatiles and semivolatiles)
For details, visit our website at
Our reference materials for the method include the
recommended surrogates (cat.# 30243). The
method also requires 3 or more internal standards
that are similar in analytical behavior to the target
compounds. Our internal standard mix (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
interference with target compounds. Figure 1 shows
an analyses of all Method 624 target compounds on
a 40m x 0.18mm ID Rtx®-624 column. Total cycle
time is 17 minutes, which matches the cycle time for
the purge and trap concentrator.
By using a 40m x 0.18mm ID, 1.0µm Rtx® -624 col-
umn and Restek’s convenient, carefully formulated
reference materials, you can obtain rapid analyses
and accurate data. These practical advantages make
Restek the best source for materials for EPA Method
624, and for wastewater volatiles analyses in general.
624 Calibration Mix #1
bromochloromethane
2-bromo-1-chloropropane
1,4-dichlorobutane
624 Internal Standard Mix
Stability of 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
analyte will rapidly decompose. Restek specially prepares stable individual solutions of 2-chloroethyl vinyl ether in
neutral purge and trap methanol. These solutions are very stable and can be diluted without problems, using pure,
neutral, P&T grade methanol. Be careful when combining these solutions with other calibration materials - some
solutions can contain trace acidic impurities that will cause rapid decomposition of 2-chloroethyl vinyl ether. Be
especially cautious of calibration mixtures that contain high concentrations or a large number of chlorinated target
compounds; these often will contain sufficient trace HCl to cause stability problems with 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