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Pages in this section: C42 C43 C44 C45 C46 (all shown below)
background image
Applications - Direct Thermal Extraction
C42
Scientific Instrument Services, Inc.
™
Phone: 908-788-5550
www.sisweb.com/catalog/08/C42
To MS
or GC
Detector
GC Injection
Port
Capillary
Column
Cryo Trap
Sample
on Column
Temperature
Program for
GC Oven
Analysis
GC Oven
Sample
Heating
Blocks
Cross Section
of GLT
Desorption Tube
Inert
Glass
Lining
Needle
Silanized
Glass
Wool Plug
Solid Sample
1-500 mg or
adsorbent
resin
Silanized
Glass Wool
Plug
Carrier
Gas
Flow
Terpines
MW=136
Hydroxy-Terpines
MW=154
8e+07
7 .5e+07
7e+07
6 .5e+07
6e+07
5 .5e+07
5e+07
4 .5e+07
4e+07
3 .5e+07
3e+07
2 .5e+07
2e+07
1 .5e+07
1e+07
5000000
58.00
56.00
54.00
52.00
50.00
48.00
46.00
44.00
42.00
40.00
38.00
36.00
34.00
32.00
30.00
Time
Sesqui-Terpenes
MW=204
Technique: Direct Thermal Extraction of Solid Samples
Sample: 2.0 mg. crushed black pepper was placed inside the GLT desorption tube
Thermal Desorption: Block temperature: 150°C, Purge flow: 2.0 ml/min He,
Desorption time: 6.0 min. Initial column trap temperature: -40°C
Column: DB-5, 60 meter x 0.25 mm I.D., 0.25 u film, -40° to 280°C at 10°/min.
0
T i m e
1
4
3
5
6
7
8
2
10.00
12.00
14.00
16.00
18.00
20.00
22.00
24.00
26.00
28.00
2 0 0 0 0 0 0
3 0 0 0 0 0 0
4 0 0 0 0 0 0
5 0 0 0 0 0 0
6 0 0 0 0 0 0
7 0 0 0 0 0 0
8 0 0 0 0 0 0
9 0 0 0 0 0 0
1 e + 0 7
1 . 1 e + 0 7
1 . 2 e + 0 7
1 . 3 e + 0 7
1 . 4 e + 0 7
1 . 5 e + 0 7
1 . 6 e + 0 7
1 0 0 0 0 0 0
5. Gamma Terpinene
6. Methyl Salicylate
7. Eugenal
8. BHT - 160 ppm
1. Ethyl Butyrate
2. Isoamyl Acetate
3. Beta Pinene
4. Limonene
Technique: Direct Thermal Extraction of Solid Samples
Sample: 8.3 mg. of thinly sliced gum was placed inside the GLT desorption tube
Thermal Desorption: Block temperature: 100°C, Purge flow: 2.0 ml/min He,
Desorption time: 10.0 min. Initial column trap temperature: -40°C
Column: DB5-MS, 30 meter x 0.25 mm I.D., 0.25 u film, -40° to 280°C at 10° /min.
2
4
6
8
10
12
14
16
18
20
22
24
1
Limonene
8e+07
7 .5e+07
7e+07
6 .5e+07
6e+07
5 .5e+07
5e+07
4 .5e+07
4e+07
3 .5e+07
3e+07
2 .5e+07
2e+07
1 .5e+07
1e+07
5000000
Technique: Direct Thermal Extraction of Solid Samples
Sample: 2.0 mg. of candy was placed inside the GLT desorption tube
Thermal Desorption: Block temperature: 150°C, Purge flow: 2.0 ml/min He,
Desorption time: 6.0 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.
T
he technique of Direct Thermal Extraction permits the
analysis of solid samples without any prior solvent
extraction or other sample preparation. Solid samples
between 1 and 500 milligrams are placed directly inside the GLT
desorption tube between two glass wool plugs. The desorption
tube needle is attached to one end of the sample tube. The
desorption tube with sample enclosed is then attached to the
Short Path Thermal Desorption System, purged with carrier gas
to remove all traces of oxygen and injected into the GC injection
port. The preheated heater blocks are closed around the
desorption tube thereby permitting the thermal extraction of the
volatiles and semi-volatiles present into the GC injection port.
After the desorption is complete, these components, which have
been trapped on the front of the GC column, are eluted and
separated via a temperature program of the GC oven. This
technique is useful for the analysis and quantification of a wide
variety of low moisture content solid samples including
vegetation, food products, pharmaceuticals, building materials,
forensic samples and packaging products. By the proper
selection of the desorption block temperature, the number and
molecular weight distributions of components in the samples can
be selected.The following three pages show applications of the
Direct Thermal Extraction technique for the analysis of the
volatiles and semi-volatiles in a wide range of sample matrices.
Food Products
The natural and artificial flavors, preservatives, oils, and other
volatile and semi-volatile components in low moisture content
food samples can be readily extracted and identified via the Direct
Thermal Extraction Technique.
Black Pepper
Fruit Flavored
Chewing Gum
Sugar Candy
Terpenes
MW=136
Hydroxy-Terpenes
MW=154
Sesqui-Terpenes
MW=204
See WEB Site for complete
Application Notes
background image
C43
Applications - Direct Thermal Extraction
Scientific Instrument Services, Inc.
™
FAX: 908-806-6631www.sisweb.com/catalog/08/C43
1
2
3
22.00
24.00
26.00
28.00
30.00
32.00
34.00
36.00
38.00
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
Time
0
5
1. Acetic Acid
2. Phenol
3. 1,2,3- Propane
triol monoacetate
4. triacetin
5. styrene
4
Pharmaceuticals
The residual solvents, manufacturing precursors, contami-
nants and decomposition products in pharmaceutical samples
can be easily detected and identified using the Direct Thermal
Extraction Technique.
Sample: 2.0 mg. crushed aspirin was placed inside the GLT desorption tube
Thermal Desorption: Block temperature: 100°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.
Aspirin
1 0 0 0 0 0 0
2 0 0 0 0 0 0
3 0 0 0 0 0 0
4 0 0 0 0 0 0
5 0 0 0 0 0 0
6 0 0 0 0 0 0
7 0 0 0 0 0 0
8 0 0 0 0 0 0
9 0 0 0 0 0 0
1 e + 0 7
1 . 1 e + 0 7
1 . 2 e + 0 7
2 2 . 0 0
2 4 . 0 0
2 4 . 0 0
2 8 . 0 0
3 0 . 0 0
3 2 . 0 0
3 4 . 0 0
3 6 . 0 0
3 8 . 0 0
4 0 . 0 0
4 2 . 0 0
4 4 . 0 0
Ti m e
1. BHT
1
Commercial Products
A wide range of solid matrix commercial products including
packaging materials, building products, manufactured materials,
and natural products can be analyzed using the Direct Thermal
Extraction Technique.
34. 00
32. 00
30. 00
28. 00
26. 00
24. 00
22. 00
20. 00
100000
200000
300000
400000
500000
600000
700000
800000
900000
Butyl Carbitol
BHT
CH3 COO (CH7)3 CH3
OH
Time
CH3 COOH
Sample: 10.0 mg. of a 3 year old Tablet was placed inside the GLT desorption tube
Thermal Desorption: Block temperature: 125°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: 2.0 mg. of rubber from a new automobile tire was placed inside the GLT desorption tube
Thermal Desorption: Block temperature: 125°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.
Automobile Tire
Penicillin
Sample: 2.0 sq. mm. of a transparent tape was placed inside the GLT desorption tube
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. BHT
1
16.00
18.00
20.00
22.00
24.00
26.00
28.00
30.00
32.00
34.00
36.00
38.00
0
2000000
4000000
6000000
8000000
1e+07
1.2e+07
1.4e+07
1.6e+07
1.8e+07
2e+07
2.2e+07
Time
1 0 0 0 0 0 0
2 0 0 0 0 0 0
3 0 0 0 0 0 0
4 0 0 0 0 0 0
5 0 0 0 0 0 0
6 0 0 0 0 0 0
7 0 0 0 0 0 0
8 0 0 0 0 0 0
9 0 0 0 0 0 0
1 e + 0 7
1 . 1 e + 0 7
2 2 . 0 0
2 4 . 0 0
2 6 . 0 0
2 8 . 0 0
3 0 . 0 0
3 2 . 0 0
3 4 . 0 0
3 6 . 0 0
3 8 . 0 0
4 0 . 0 0
4 2 . 0 0
4 4 . 0 0
0
1. THC
1
Residue equivalent to
a 90% evaporated
gasoline sample
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
2
4
6
8
10
12
14
16
18
20
22
24
26
500000
1000000
1500000
2000000
2500000
3000000
3500000
0
20.00
25.00
30.00
35.00
40.00
45.00
Time
Plastic Food Wrap
Marijuana
Arson Wick
Recycled Cardboard
Plastics and Packaging Materials
Packing materials including plastics provide a unique appli-
cation of the Direct Thermal Extraction Technique to analyze the
surface contaminants on these materials.
Forensic Applications
The Direct Thermal Extraction Technique can be used to ana-
lyze and compare forensic samples ranging from vegetation to
physical evidence.
Sample: 2.0 sq. in. piece of a clear plastic food wrap was placed inside the GLT desorption tube.
Thermal Desorption: Block temperature: 100°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: 250 sq. mm. of recycled cardboard was placed inside the GLT desorption tube.
Thermal Desorption: Block temperature: 200°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: 2 small threads from a Molotov cocktail were placed inside the GLT desorption tube.
Thermal Desorption: Block temperature: 150°C, Purge flow: 6.0 ml/min He,
Desorption time: 10.0 min. Initial column trap temperature: -10°C
Column: SPB, 30 meter x 0.75 mm I.D., 1.0 u film, -10° to 250°C at 12°/min.
Sample: 3.0 mg. of marijuana was placed inside the GLT desorption tube. Data courtesy NJSP.
Thermal Desorption: Block temperature: 200°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.
2000000
4000000
6000000
8000000
1e+07
1.2e+07
1.4e+07
1.6e+07
1.8e+07
2e+07
0
16.00
1 8 . 0 0
2 0 . 0 0
2 2 . 0 0
2 4 . 0 0
2 6 . 0 0
2 8 . 0 0
3 0 . 0 0
3 2 . 0 0
3 4 . 0 0
3 6 . 0 0
3 8 . 0 0
1. 2-ethyl hexanol
2. 3-ethyloctane
3. diethyl phthalate
4. dibutyl phthalate
5. Bis (2-ethyl hexyl)-
phthalate
6. Dimethylsqualene
7. Dioctyl phthalate
1
2
3
4
5
6
7
8
background image
Applications - Thermal Desorption
C44
Scientific Instrument Services, Inc.
™
Phone: 908-788-5550
www.sisweb.com/catalog/08/C44
1. benzene
2. toluene
3. tetra chloro ethane
4. 2- Fluorocarboxaldehyde
5. ethyl benzene
6.00
7.00
8.00
9.00
10.00
11.00
12.00
13.00
200000
400000
600000
800000
1000000
1200000
1400000
1600000
1800000
2000000
2200000
2400000
2600000
2800000
3000000
0
Time
2
3
4
6
7
1
5
6. xylene
7. xylene
8. xylene
1. Diallyl Sulfide
2. 2,5 Dimethyl
Thiophene
3. Methyl,
Allyl Disulfide
4. P-Cymene
5.Diallyl Disulfide
1
2
5
5 : 0 0
1 0 : 0 0
1 5 : 0 0
2 0 : 0 0
2 5 : 0 0
3 0 : 0 0
3 5 : 0 0
0 . 0
0 . 5
1 . 0
4
3
Technique: Sampler Oven for Larger Solid Samples
Sample: 1.0 gram garlic was flushed with N
2
(50°C) in the sampler oven and the
eluted compounds trapped on a Tenax trap. Data courtesy CAFT, Rutgers University.
Thermal Desorption: Block temperature: 220°C, Purge flow:10.0 ml/min He,
Desorption time: 5.0 min. Initial column trap temperature: Injection Port Split: 10:1
Column: 60 meter x 0.32 mm I.D. DB-1, 0.25u film, -20°C to 280°C at 10°C /min.
Technique: Sampler Oven for Larger Solid Samples
Sample: 2.0 gram soil was flushed with N
2
(70°C) in the sampler oven and the
eluted compounds trapped on a Tenax trap.
Thermal Desorption: Block temperature: 220°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. Hexanal
2. Methyl Pyrazine
3. 2-Pentyl Furan
4. Nonanal
1 .0
0 .5
0 .0
5 :00
10 :00
15 :00
20 :00
25 :00
30 :00
35 :00
40 :00
1
2
3
4
Technique: Sampler Oven for Larger Solid Samples
Sample: 10.0 gram corn meal was flushed with N
2
(160°C) in the sampler oven and the
eluted compounds trapped on a Tenax trap. Data courtesy CAFT, Rutgers University.
Thermal Desorption: Block temperature: 220°C, Purge flow:10.0 ml/min He,
Desorption time: 5.0 min. Initial column trap temperature: Injection Port Split: 10:1
Column: 60 meter x 0.32 mm I.D. DB-1, 0.25u film, -20° to 40°C at 10°/min., then to
280° at 4° / min.
Technique: Sampler Oven for Larger Solid Samples
Sample: 0.5 gram cherry wood was flushed with N
2
(70°C) in the sampler oven and the
eluted compounds trapped on a Tenax trap.
Thermal Desorption: Block temperature: 220°C, Purge flow:10.0 ml/min He,
Desorption time: 5.0 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.,
3e+07
2.5e+07
2e+07
1.5e+07
1e+07
5000000
6.00
8.00
10.00
12.00
14.00
16.00
18.00
20.00
22.00
24.00
26.00
terpenes
sesqui
terpenes
Time
1. Alpha Creosol
2. toluene
1
2
Corn Meal
Garlic
Soil
Wood Sample
Sample Collection System
T
he Sample Collection System permits the analysis of
solid samples which are too large to fit inside the GLT
desorption tubes directly. For instance when analyzing for
residual concentrations in the ppm and ppb range, and for the
analysis of samples which contain appreciable concentrations of
water which would form ice plugs if desorbed directly into the GC
column. Samples from 0.5 to 50 grams in size are placed inside a
long glass tube between two glass wool plugs. The tube is insert-
ed into the Solid Sampler oven, which can be heated to any tem-
perature up to 250°C, depending on the boiling point of the residual
volatiles the analyst wishes to detect. Carrier gas is purged in one
end of the heated tube and a desorption tube packed with Tenax or
other suitable adsorbent resin is attached at the opposite end. The
packed desorption tube has been previously cleaned and condi-
tioned to remove any contaminants from the adsorbent resins. If
the sample contains appreciable amounts of water, an optional dry
purge or makeup gas may be added just before the desorption
tube. This gas prevents the saturation of the adsorbent packing
with water and helps purge the water from the adsorbent resin
(Tenax has a low affinity for water). Samples are normally purged
with high purity Nitrogen or Helium at flow rates of 10 to 60 ml/min
for 10 to 60 minutes. The oven temperature is normally maintained
at 50 to 80°C for most volatiles such as benzene and toluene but
can be raised to higher temperatures for higher molecular weight
compounds.
Dry Make Up
Gas Flow (Opitional)
Carrier Gas
Flow
Sample
Heater Block
GLT Desorption
Tube
with Tenax
S.S. Connector, 0.5" to
Desorption Tube
with Purge Gas Inlet
S.S. Connector, 0.5"
to 1/8" Swagelok
Sample for
Analysis
Quartz Wool
Plug
1/4" or 1/2" x 14" Long Glass Tube
background image
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
background image
Applications - Environmental, Plants & Commercial
C46
Scientific Instrument Services, Inc.
™
Phone: 908-788-5550
www.sisweb.com/catalog/08/C46
Air Sampling from Plants and Commercial Products
Technique: Dynamic Headspace Purging
Sample: The volatiles from a Chrysanthemum flower in a Wheaton Purge and Trap
Apparatus were trapped on Tenax traps.
Thermal Desorption: Block temperature: 200°C, Purge flow1.5 ml/min He,
Desorption time: 5.0 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.
Technique: Air Sampling of Volatiles from Adsorbent Traps
Sample: A 70 liter sample of air from leaves of a Bartlett Pear Tree were pumped through a
Tenax GLT desorption trap using a portable pump. Data Courtesy CAFT, Rutgers Univ.
Thermal Desorption: Block temperature: 200°C, Purge flow10.0 ml/min He,
Desorption time: 10.0 min. Initial column trap temperature: -40°C
Column: DB-1, 60 meter x 0.32 mm I.D., 0.25 u film, -20° to 280°C at 10°/min.
M
any plants and animals as well as commercial products may produce odors or volatile emissions which can be trapped on
adsorbent traps and then analyzed via the Short Path Thermal Desorption System. The air from the samples or materials is
passed through the GLT desorption tube which has been packed with Tenax or some other adsorbent resin.
1 . 0
0 . 5
0 . 0
10 : 00
20 : 00
30 : 00
40 : 00
50 : 00
60 : 00
70 : 00
80 : 00
90 : 00
100 : 00
1. 2-Trans Hexenol
2. 2- Trans Hexenyl Acetate
2
1
500000
1000000
1500000
2000000
2500000
3000000
3500000
4000000
4500000
5000000
5500000
6000000
0
6.00
8.00
10.00
12.00
14.00
16.00
18.00
20.00
22.00
24.00
Time
4
1. 2 propanone
2. methyl benzene
3. pinene
4. camphor
1
2
3
Chrysanthemum
Bartlett Pear Tree Leaves
Air Sampling - Environmental Monitoring
T
he Volatiles present in the environmental air can be readily analyzed using the Short Path Thermal Desorption System. The air
to be analyzed is pumped through a GLT desorption tube which has been previously packed with an adsorbent resin such as
Tenax.Any of a wide variety of small air pumps (vacuum) that are commercially available can be used to pump the air through
the desorption tube.
48.00
46.00
44.00
42.00
40.00
38.00
36.00
34.00
32.00
30.00
28.00
26.00
24.00
22.00
1. Methylbenzene
2. Dimethylbenzene
3. Trimethylbenzene
4. Diethylbenzene
5. Methylnaphthalene
5 . 5e+07
5e+07
4e+07
4 . 5e+07
3 . 5e+07
3e+07
2 . 5e+07
2e+07
1 . 5e+07
1e+07
5000000
0
Time
1
2
3
5
4
Technique: Air Sampling of Volatiles from Adsorbent Traps
Sample: A 70 liter sample of air from a residential garage (December) was pumped through
a Tenax GLT desorption trap.
Thermal Desorption: Block temperature: 250°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.
2 0 : 0 0
3 0 : 0 0
4 0 : 0 0
5 0 : 0 0
6 0 : 0 0
7 0 : 0 0
8 0 : 0 0
1 0 : 0 0
1 . 0
0 . 5
0 . 0
Technique: Air Sampling of Volatiles from Adsorbent Traps
Sample: A 100 liter sample of air from a New York City Energy Efficient Skyscraper
was pumped through a Tenax GLT desorption trap. Data Courtesy CAFT Rutgers Univ.
Thermal Desorption: Block temperature: 250°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 40° at 10°/min, 40° to 280° at 4°/min
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
26
24
22
20
18
1
6
14
12
10
8
6
4
2
Technique: Air Sampling of Volatiles from Adsorbent Traps
Sample: A 1.0 liter sample of air from a container spiked with gasoline was pumped
through a Tenax GLT desorption trap. Data Courtesy NJSP.
Thermal Desorption: Block temperature: 250°C, Purge flow: 6.0 ml/min He,
Desorption time: 10.0 min. Initial column trap temperature: -40°C
Column: SPB-1, 30 meter x 0.75 mm I.D.,1.0 u film,-40° to 250°C at 12°/min.
Garage Air
Energy Efficient NYC Skyscraper
Forensic Arson
Analysis - Gasoline
Air Sampling Pump
GLT Desorption Tube
packed with Adsorbent Resin
Adapter Fitting
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