908-788-5550

Thermal Desorption Sample Collection System

Thermal Desorption Sample Collection System
Hover over image to zoom

Description

This Sample Collection System permits the purging of volatiles and semi-volatile components present in solid materials and their trapping on Desorption Tubes packed with an adsorbent resin for subsequent analysis by desorption utilizing the Short Path Thermal Desorption System. Volatiles can be collected from sample sizes ranging from less than 0.5 gram up to 20 grams.

This technique for collecting volatiles from samples for analysis is used:

(1) To permit the analysis of trace components in larger sample sizes than could be analyzed by Direct Thermal Desorption in the Short Path Thermal Desorption System. Soil samples up to 20 grams can be sampled in the 0.5" diameter tubes.

(2) To permit the analysis of volatiles from organic samples containing high concentrations of water. Water is not retained by many adsorbents (such as Tenax®) whereas other organic volatiles would be trapped by the adsorbents. Water interferes with the GC analysis by forming plugs to block carrier gas flow through the GC columns when the GC oven is maintained at subambient temperatures during the initial desorption of samples into the GC.

(3) To permit the analysis of volatiles emitted from the samples at different temperatures by collecting the volatiles onto Desorption Tubes at increased temperatures. It is therefore possible to set up studies to determine the temperatures of emission of volatiles and semi-volatiles from materials such as carpet fibers, packaging materials, building products, etc.

Samples to be analyzed are placed inside glass or stainless steel tubes and held in place by glass wool plugs. The system is designed to sample from 0.5" diameter glass tubes, and also from 0.25" diameter glass tubes with optional adaptors. Sample tubes are 14.0" long each. When ready for sample collecting, the long tube containing the sample is placed in the sample Collection Oven, fitted at one end with a supply of carrier gas to flush out the residues, and fitted at the opposite end with a preconditioned Desorption Tube with adsorbent resin. The Oven is set for the desired temperature and the desired components are collected onto the Desorption Tubes. Oven temperatures can range from room temperature up to 250 °C. The temperature used, as well as the time of sampling, depends on the nature of the samples being analyzed and the requirements of the analyst. Soil samples are typically analyzed at 80 °C and sampled for 30 to 60 minutes.

The Sample Collection System consists of a sample tube oven with ports for four 0.5" diameter sample tubes. Up to four samples can be collected simultaneously with the system. Four rotameters regulate the gas flow through each of the samples independently of one another. A precision Temperature Controller provides accurate control of the temperature of the Sample Collection Oven up to 250 °C. A digital readout indicates the actual oven temperature. The actual Sample Collection Oven consists of a large aluminum plate with holes drilled for the sample tubes and is heated by cartridge heaters. Heat transfer to the sample tubes occurs via direct thermal transfer from the aluminum block to the sample tubes. Temperatures can be maintained within 1% of the full scale reading.

Sample Collection System for the Collection of Volatiles from Solid Samples

On the front of the Sample Collection System four quick disconnect fittings connect to a 1/8 inch flexible transfer line to provide gas flow through each of the sample tubes and Desorption Tubes during sampling. By providing gas flow from a carrier gas such as Nitrogen or Helium through the heated sample tubes and the Desorption Tubes while sampling, the volatiles and semi-volatiles will be purged from the sample and will be trapped by the adsorbent in the Desorption Tube. A single 1/8 inch fitting on the back of the System is provided for the attachment of the gas from its source.

Dimensions

Sample Collecting Oven Accessories

Fittings

Sample Collecting Oven Fittings

*Note- Custom size sample collecting ovens can be manufactured by S.I.S. on special request. Call or write with your requirements for a quotation.

* For internal standard loading through a septum onto glass sample tubes see page 27 for more details.

0.5in O.D.x 0.36in I.D.x 14in long img=
Part No. Description Picture Stock/
Lead Time
Price
EA
Order
782050 Sample Collection Oven for 4 samples with 4 rotameters, 4 - 0.5in ports , 4 - 0.5in glass sample with fittings, tubes, (4 - 782071, 2 - 782072, and 2 - 782075) 4 - Desorption Tube Caps with holes thumbnail 0*Lead time for this non-stock item is approximately 28 days. $4325.00
Qty
Accessories
782061 Sample Tube, Glass, 0.5in O.D. x 0.36in I.D. x 14in long thumbnail 22$15.25
Qty
782062 Sample Tube, Glass, 0.25in O.D. x 0.15in I.D. x 14in long thumbnail 0Lead time for this non-stock item is approximately 3 days. $15.25
Qty
782063 Sample Tube, Stainless Steel 0Lead time for this non-stock item is approximately 3 days. $36.75
Qty
782064 Sample Tube, Stainless Steel, 0.25in O.D.x 0.15in I.D.x 14in long thumbnail 0Standard lead-time for non-stock items is approximately two weeks depending on the item. $36.75
Qty
782065 Reducing Adaptor Vespel, 0.5in to 0.25in sample tube thumbnail 0Standard lead-time for non-stock items is approximately two weeks depending on the item. $81.90
Qty
782066 Reducing Adaptor PTFE, 0.5in to 0.25in sample tube 0Standard lead-time for non-stock items is approximately two weeks depending on the item. $25.20
Qty
782071 S.S. Connector, 0.5 in to 1/8 in Swagelok thumbnail 24 hours§Lead time for this non-stock item is approximately 24 hours. $38.50
Qty
782072 SS Desorption Tube to 0.5in Swagelok Connector thumbnail 0Standard lead-time for non-stock items is approximately two weeks depending on the item. $95.00
Qty
782073 S.S. Connector, 0.25 in to 1/8 in Swagelok thumbnail 24 hours§Lead time for this non-stock item is approximately 24 hours. $25.20
Qty
782074 SS Desorption Tube to 0.25in Swagelok Connector thumbnail 0Standard lead-time for non-stock items is approximately two weeks depending on the item. $64.00
Qty
782081 0.5in PTFE Seal 24 hours§Lead time for this non-stock item is approximately 24 hours. $8.95
Qty
782082 0.25in PTFE Seal 24 hours§Lead time for this non-stock item is approximately 24 hours. $7.50
Qty
782075 SS Desorption Tube to 0.5in Swagelok Connector with 1/16in side purge port thumbnail 0Standard lead-time for non-stock items is approximately two weeks depending on the item. $173.00
Qty
782076 SS Desorption Tube to 0.25in Swagelok Connector with 1/16in side purge port thumbnail 0Standard lead-time for non-stock items is approximately two weeks depending on the item. $178.00
Qty
781007 S.S. Desorption Tube Cap with 0.040in hole for conditioning Silco Coated tube thumbnail 103$9.95
Qty
782077 Injection Head with Septum for 1/4in tubes 0Standard lead-time for non-stock items is approximately two weeks depending on the item. $247.00
Qty
782078 Injection Head with Septum for 1/2in tubes thumbnail 0Standard lead-time for non-stock items is approximately two weeks depending on the item. $247.00
Qty
Tenax® is a registered trademark of Buchem BV.
Popular Items also Purchased
  • Short Path Thermal Desorption Accessories Supply KitShort Path Thermal Desorption Accessories Supply Kit
    When ordering the Short Path Thermal Desorption System, a wide range of systems and accessories are available depending on the application requirements of the user.
  • Short Path Thermal Desorption TubesShort Path Thermal Desorption Tubes
    After conditioning and sample loading, the ends of the tubes are fitted with stainless steel caps with seals to maintain the integrity of the medium and sample.
  • Purge and Trap Stainless Steel Purge HeadsPurge and Trap Stainless Steel Purge Heads
    The top fitting of both purge heads consists of a 1/16" fitting for the attachment of the sparging needle followed by needle adaptor to seal the needle in place and provide for the attachment of the purging gas line.
  • Seals for SIS Thermal Desorption TubesSeals for SIS Thermal Desorption Tubes
    Seals are utilized in a variety of locations in the Short Path Thermal Desorption Unit.
  • Thermal Desorption Sample LoaderThermal Desorption Sample Loader
    This device is used to inject or load liquid samples directly into the S.I.S. Thermal Desorption Tubes, forcing the syringe contents onto the adsorbent resins in the desorption tube without any loss of sample due to back evaporation.
  • Wheaton Purge and Trap SystemWheaton Purge and Trap System
    The Wheaton Purge and Trap Apparatus is widely used for the isolation of pollutants in soil, sediment, waste water, and other solid and liquid samples by purging a clean gas over and thru the sample contained therein and trapping the purged volatiles on adsorbent traps.
  • Desorption Tube FittingsDesorption Tube Fittings
    Fittings to connect our 1/4" O.D. GLT desorption tubes to your particular application.