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Compound Concentration
1. C7 61%
2. ethanol 10%
3. benzene 5%
4. 2-butanol (IS) 4%
5. toluene 20%
Column: D3606 TCEP Column Set-Up (Column 1: 5', 1/8" OD, 10% OV 101 on Chromosorb PAW 80/100, Column 2: 5', 1 /8" OD, 20%
TCEP on Chromosorb PAW 80/100, and Column 3: 15', 1/8" OD, 15% Carbowax 1540 on Chromosorb W); Instrument: Agilent
6890; Sample: mixed standard prepared in C7; Inj.: 1 µL, direct; Inj. temp.: 200 °C; Carrier gas: helium, constant flow; Flow
rate: 26 mL/min.; Oven temp.: 135 °C, isothermal; Det.: TCD @ 200 °C
Poor resolution; ethanol
tails into benzene.
GC_PC01105
Figure 1 TCEP columns often fail to adequately resolve benzene from ethanol,
resulting in poor quantitative results
Compound Concentration
1. C7 61%
2. ethanol 10%
3. benzene 5%
4. 2-butanol (IS) 4%
5. toluene 20%
Column: D3606 Application Column (2 column set, cat.# 83606) (Column 1: nonpolar Rtx®-1, 6' (1.8 m), 1/8" OD, 2.0 mm ID and
Column 2: proprietary packing material, 16' (4.9 m), 1/8" OD, 2.0 mm ID); Instrument: Wasson 3606/5599 combo 6890N GC;
Sample: mixed standard prepared in C7; Inj.: 1 µL, direct; Inj. temp.: 200 °C; Backflush time: 3 min.; Carrier gas: helium, con-
stant flow; Flow rate: 25 mL/min.; Oven temp.: 135 °C, isothermal ; Det.: TCD @ 200 °C
GC_PC01103
Baseline resolution of
ethanol and benzene!
Figure 2 Restek's new D3606 column set accurately and reliably separates benzene
from ethanol, improving quantitative accuracy.
2.5 5.0 7.5 12.5 15.0 17.5
Time (Min)
10.0
GC_PC01096
1
2
3
4
Compound Concentration
1. ethanol 9.94 volume %
2. benzene 1.14 volume %
3. 2-butanol (IS) 4.01 volume %
4. toluene 9.93 volume %
Column: D3606 Application Column (2 column set, cat.# 83606-800) (Column 1: 6' (1.8 m), 1/8" OD, 2.0 mm ID, nonpolar Rtx®-1
and Column 2: 16' (4.9 m), 1/8" OD, 2.0 mm ID, proprietary packing material); Sample: gasoline; Inj.: 1 µL; Backflush: 3.0 min.;
Carrier gas: helium; Flow rate: 20.4 mL/min.; Oven temp.: 135 °C; Det.: TCD; Courtesy of Joaquin Lubkowitz, Separation
Systems, Gulf Breeze, Florida
Figure 3 Ethanol and benzene are reliably resolved in commercial gasoline by
beta testers using the D3606 column set.
Using Restek gas filters is an easy way
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13
Restek Super-Clean
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• High-purity output ensures 99.9999% pure
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• All traps measure 105/8" x 1 3/4" (27 x 4.4 cm).
• Each base plate unit measures 4" x 4" x 17/8"
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Description qty. cat.#
Carrier Gas Cleaning Kit
Includes: mounting base plate,
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oxygen/moisture/hydrocarbon
Triple Gas Filter kit 22019
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