C45
Applications - Purge & Trap
Scientific Instrument Services, Inc.
™
FAX: 908-806-6631www.sisweb.com/catalog/08/C45
Sparging Gas
Dry Purge Gas
S.S. Purging
Head Assembly
GLT Desorption Tube
Adsorbent Packing
Adaptor Fitting
Sparging
Needle
5 ml Test tube
with liquid
sample
Needle Adaptor
781007
2000000
4000000
6000000
8000000
1e+07
1.2e+07
1.4e+07
1.6e+07
1.8e+07
2e+07
2.2e+07
2.4e+07
0
4
8
12
16
20
24
28
32
36
40
44
48
Purge and Trap of Liquids
T
he Short Path Thermal Desorption System can be used
for the analysis of volatile organics (VOC's) in commer-
cial water based products including liquid formulations,
colloidal suspensions, and liquid pastes. Using the S.I.S. Purge
and Trap System for the purging of the volatiles from the liquid
based samples followed by trapping on GLT desorption traps
packed with Tenax or other suitable resins, the samples thus col-
lected can be analyzed using the Short Path Thermal Desorption
System. Using this technique it is possible to detect and identify
various flavors, fragrances, off-odors, and manufacturing by-prod-
ucts in a wide diversity of liquid matrix samples.
2
4
6
8
10
12
14
16
18
20
22
24
26
1
2
3
4
5
6
1. Benzene
2. Toluene
3. 2- Bromo-1 chlor-propane
4. m-Xylene
5. p-isopropyltoluene
6. naphthalene
2000000
4000000
6000000
8000000
1e+07
1.2e+07
1.4e+07
1.6e+07
1.8e+07
2e+07
2.2e+07
2.4e+07
0
Sample: 50 ml of water spiked with several aromatics at 20 ppm was purged with 300 ml of high
purity He at 20 ml/min and a dry purge of 20 ml/min. The volatiles were trapped on Tenax traps.
Thermal Desorption: Block temperature: 150°C, Purge flow:2.0 ml/min He,
Desorption time: 10.0 min. Initial column trap temperature: -40°C
Column: DB-5, 25 meter x 0.25 mm I.D., 0.25 u film, -40° to 280°C at 10°/min.
Sample: Toothpaste was diluted with water (1:5) and then 5.0 ml of this solution was purged with
120 ml of high purity He at 20 ml/min and a dry purge of 20 ml/min
Thermal Desorption: Block temperature: 150°C, Purge flow:2.0 ml/min He,
Desorption time: 10.0 min. Initial column trap temperature: -40°C
Column: DB-5, 25 meter x 0.25 mm I.D., 0.25 u film, -40° to 280°C at 10°/min.
1. 2-Propanol,
2-methyl
2. 2-Butanone
3. Benzene
4. 1-Butanol
5. Toluene
6. Heptanone
7. 1,2-dimethyl
Benzene
8. 2-Heptanone
10.00
15.00
20.00
25.00
30.00
35.00
40.00
1000000
2000000
3000000
4000000
5000000
6000000
7000000
8000000
9000000
1e+07
1.1e+07
Time
9. n-Butyl,Propionate
10. 2-methyl-Decane
11. 3,3,8-trimethyl-Decane
12. 3,3,6-trimethyl-Decane
13. n-Butyl n-Butyrate
1
2
3
4
5
6
10
7
8
9
11
12
13
Sample: 1.0 ml latex Enamel paint was purged with 150 ml of high purity He at 15 ml/min
and dry purge of 15 ml/min.
Thermal Desorption: Block temperature: 150°C, Purge flow:2.0 ml/min He,
Desorption time: 10.0 min. Initial column trap temperature: -40°C
Column: DB-5, 25 meter x 0.25 mm I.D., 0.25 u film, -40° to 280°C at 10°/min.
Sample: 5.0 ml Olive Oil was purged with 2000 ml of high purity He at 20 ml/min
and dry purge of 20 ml/min. The volatiles were trapped on Tenax traps.
Thermal Desorption: Block temperature: 150°C, Purge flow:2.0 ml/min He,
Desorption time: 10.0 min. Initial column trap temperature: -40°C
Column: DB-5, 25 meter x 0.25 mm I.D., 0.25 u film, -40° to 280°C at 10°/min.
4.00
7.00
8.00
9.00
10.00 11.00
12.00 13.00 14.00 15.00 16.00 17.00 18.00
19.00
200000
400000
600000
800000
1000000
1100000
1200000
1600000
2000000
2100000
2200000
0
Time
1. Hexane
2. Ethyl Acetate
3. Benzene
4. Heptane
5. Toluene
6. 1-Octene
7. Octene
8. 2-Octene, (Z)
9. 2-Octene
10. Styrene
1
2
3
5
6
7
8
9
10
4
Volatile Organics
in Water
Toothpaste
Olive Oil
VOC's in
Latex Paint
Purge and Trap System
GLT Desorption Tube
Adsorbent Packing
Adapter Fitting
Needle Adapter
Dry Purge Gas
Sparging
Needle
S.S. Purging
Head Assembly
5 ml Test Tube
with Liquid
Sample
Sparging Gas
1000000
2000000
3000000
4000000
5000000
6000000
7000000
8000000
9000000
1e+07
1.1e+07
1.2e+07
1.3e+07
1.4e+07
0
16.00
18.00
20.00
22.00
24.00
26.00
28.00
30.00
32.00
34.00
Time
1. Ethyl Acetate
2. Ethyl Propionate
3. Ethyl Butyrate
4. Benzaldehyde
5. Ethyl Caproate
6. 1-Limonene
7. Propyl Acetate
8. Capraldehyde
1
4
3
5
6
7
8
2
Sample: 25 ml of Brand A of a Wine Cooler was purged with 300 ml of high purity He at
30 ml/min and a dry purge of 30 ml/min. The volatiles were trapped on Tenax traps.
Sample Split Ratio: 20:1
Thermal Desorption: Block temperature: 150°C, Purge flow:2.0 ml/min He,
Desorption time: 10.0 min. Initial column trap temperature: -40°C
Column: DB-5, 25 meter x 0.25 mm I.D., 0.25 u film, -40° to 280°C at 10°/min.
14
12. Linalool
13. Benzyl Acetate
14. Linalyl Acetate
15. Neryl Acetate
16. Geranyl Acetate
17. alpha-Copaene
18. Trans-
Caryophyllene
6500000
6000000
5500000
5000000
4500000
4000000
3500000
3000000
2500000
2000000
1500000
1000000
500000
0
6.00
8.00
10.00
12.00
14.00
16.00
18.00
20.00
22.00
24.00
Time
1
2
3
4
5
6
7
8
9
10
13
16
18
12
1. 2-Butanone
2. 2-Pentanone
3. 1,4-Dioxane
4. 2-Hexanone
5. Ethylbenzene
6. alpha-Pinene (-)-
7. Camphene
8. Benzaldehyde
9. 2-beta-Pinene
10. 1-Limonene
11. gamma-Terpinene
11
15
17
Sample: 5.0 ml of Liquid Shampoo was purged by passing 200ml of high purity He over the
surface of the liquid shampoo at the rate of 20 ml/min. and a dry purge of 20 ml/min
(Dynamic Headspace Purge). The volatiles were trapped on Tenax traps.
Thermal Desorption: Block temperature: 150°C, Purge flow:2.0 ml/min He,
Desorption time: 10.0 min. Initial column trap temperature: -40°C
Column: DB-5, 25 meter x 0.25 mm I.D., 0.25 u film, -40° to 280°C at 10°/min.
Shampoo
Wine Cooler
Brand A
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