Applications and Reference Materials
for SIS Short Path Thermal Desorption Systems
Analysis of Black Tea by Purge and Trap Thermal Desorption
- Comparison of Cryo-Trap Temperatures
Short Path
Thermal Desorption Techniques
- Direct Thermal Extraction - Analysis of low moisture
solid matrix samples by thermally extracting the volatile and
semi-volatile organics directly from the solid matrix without
the use of solvents or other sample preparation. A fast, efficient
method for analyzing solid samples. Applications notes
describe the analysis of Food and Pharmaceutical Packaging, Plastics
and Food Products.
- Air Sampling - Analysis of indoor and outdoor air by
trapping the volatile organics in air on an adsorbent trap and
then using the thermal desorption system to desorb the organics
into the GC for analysis. See our application notes on
air inside Airplanes and Restaurants.
- Dynamic Headspace Purging - Analysis of the volatile
organics from large solid or liquid samples, such as vegetation,
arson analysis, flowers and growing plants using adsorbent traps
to trap the volatiles for subsequent thermal desorption analysis.
See the application notes
and application notes
on Arson analysis, Flowers and Pear Tree Leaves.
- Purge and Trap - The purging of volatiles from liquid
samples using clean carrier gases, trapping the volatiles on adsorbent
resins traps for analysis via the thermal desorption system. Application notes include
Cola Beverages, Wines, Milk,
Olive Oil and Paints.
- Purge and Trap of Solid Samples - Clean carrier gas
is used to purge the volatiles from solid matrix samples, trapping
the organics on an adsorbent resins trap for analysis via the
thermal desorption system. Application notes
include the analysis of wood, soil, peaches and
food products.
- Direct Analysis of Liquid Samples - Liquid samples
such as oils or perfumes can be directly injected into adsorbent
resin traps. The samples can be subsequently thermally desorbed
into the GC for analysis. Either the high or low volatiles can
be selectively prevented from entering the GC with this technique.
An application of this technique is the analysis of the volatiles
in Olive oils.
- Quantification - All the above techniques can be used
to quantitate the volatiles in these samples. The preferred technique
is to use deuterated internal standards for these methods. Several
application notes
are available describing the quantification of BHT in Food Products,
Naphthalene in Pharmaceuticals, and volatiles in beverages and
commercial carpeting.
Areas of
Application
- Environmental
- Analysis of the Volatiles in Air, Water and Soil.
- Food Science Applications
- Analysis of the volatiles in beverages, spices, olive oil,
wines, mushrooms, peaches,
cranberries, coffee and milk.
- Flavor and Fragrance - The analysis of flavors and
fragrances in food products,
perfumes, flowers and colognes have been studied with this technique.
- Pharmaceuticals -
The analysis of residual solvents in pharmaceuticals is an excellent
application of the Direct Thermal Extraction Technique in which
volatiles are thermally extracted directly from solid pharmaceutical
samples without the use of solvents or other sample preparation.
- Forensic - In
addition the arson analysis of crime scene evidence, thermal desorption
has been used for the analysis of residual volatiles in street
drugs, comparison of plastics and the analysis of stains on forensic
evidence.
- Packaging Materials
- The direct thermal extraction technique is a very efficient
method for the analysis of the residual volatiles and surface
contamination of plastics and packaging materials for the food
and pharmaceutical industries. With the increased use of recycled
plastics this technique will prove invaluable for the analysis
of these samples.
- Synthetic Fibers and Plastics
- The direct thermal extraction technique is a very efficient
method for the analysis of the residual volatiles and surface
contamination of plastics. Several application notes are available.
Applications Notes
-
Elimination of Memory Peaks from Thermal Desorption
A feature article describing sources
of GC contamination. This article fully describes methods to minimize
or eliminate GC and Thermal desorption system background noise
or peaks. Many users often blame Tenax® adsorbent resins for background
peaks in GC Thermal Desorption applications. However our studies
have shown this background does not normally originate from the
Tenax but from the GC injection port and capillary column. Utilizing
a high temperature flow conditioning of the GC injection port
as well as proper care and maintenance of the GC and thermal desorption
system background peaks can be minimized.
-
Selection and Use of Adsorbent Resins for Purge and Trap Thermal Desorption Appliations
This article can help you determine which adsorbent resins to
use for your application. This paper describes the parameters
which must be considered when selecting an adsorbent resin for
n application. Breakthrough volume charts are included for hydrocarbons
and alcohols on a wide range of organics. A unique Breakthrough
Volume Histogram Chart has been developed to enable you to quickly
and easily select the resin required for your application.
-
Adsorbent Resins
A complete collection of SIS publications on adsorbent resins,
breakthrough volumes, selection of resins, conditioning of desorption
tubes and much more.
Full List of Thermal Desorption Application Notes
Table of Contents
Thermal Desorption & Cryo-Trap Notes
Thermal Desorption - Direct Thermal Extraction
Thermal Desorption - Environmental
Thermal Desorption - Headspace
Thermal Desorption - Purge and Trap
Thermal Desorption - Pharmaceuticals
Thermal Desorption - Forensics
Thermal Desorption - Food Science
Thermal Desorption - Absorbent Resins
Full list of SISWEB application notes.
Tenax® is a registered trademark of Buchem BV.
SilTite™ FingerTite, the next generation GC capillary ferrule system without the use of any tools.
(25% discount until Oct 31)
Direct Replacement for the Heated Capillary in the Thermo-Fisher Scientific TSQ & LCQ Mass Spectrometers now available
- Ideal for use in analytical instrumentation
- Will improve your laboratory workflow and reporting confidence in many ways
DigiVac Bench Top Vacuum Gauges
- Vacuum instrumentation with everything you need to go to work
Imtakt HPLC Columns
-offer a wide variety of unique stationary phases in their HPLC
columns
Programmable syringe pumps for controlled flow. Model NE-300 priced at only $275.00
NEW: Wiley 9th Edition - 660,000-850,000
spectra (a 65% increase). 
NEW: Tal-Aviv Isotope
Abundance Analysis (IAA) Software - strengthens NIST MS library
search identification via isotopic abundance analysis. 
NEW: Agilent 5973/75 Replacement Source
Heater and Temperature Sensor 
NEW: SIS™ Direct Replacement
Filament for the Amatek/Dycor RGA Leak Detectors and Quadrupoles
(p/n 95381VE), which tests have shown increase service life. 
NEW: SIS™
Replacement Filter Elements For Edwards Oil Mist Eliminators -
Save up to 25% off the price of comparable Edwards replacement
elements. 
Identify mass spectra via library
search with the fully-evaluated, most widely used mass spectral
reference library, compiled by the National Institute of Standards
and Technology (NIST). 
View and capture images or video at
20x/400x power on a PC computer via attached USB cable. 