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Gas chromatography is one of the fundamental analytical tools that compose the modern analytical lab, along with Mass Spectroscoy, Spectroscopy and Microscopy. However, like everything else, it does have several limitations, including lack of sensitivity, inability to tolerate water injections, and the sample must be in the vapor state. These limitations all come into play when studying aqueous samples in drinking and waste water and beverages.

Purge and Trap, invented in the 60s in response to the Clean Water Act, is the most effective method to answer these challenges for extracting and concentrating volatile organic compounds (VOC) from liquids and solids. The Purge and Trap process involves purging the sample with an inert gas in a sealed environment (sparge vessle) at the appropriate temperature. The gas going through the sample will establish thermal equilibrium with VOCs in the sample, therefore transferring the VOCs from an aqueous state to a vapor. After eliminating the moisture through the wet trap, the gas is then swept to an analytical trap that absorbs and retains the VOCs, where they are transferred to the Gas Chromatograph for further analysis.

CDS analytical instruments are designed around a few core concepts including EPA regulation compliance, reliability, expandability, dependability and competitive pricing. It has been acknowledged as the industry workhorse for decades. To further unleash the full power of your GC systems, we designed a full suite of products including standalone autosamplers (7350 and 7450 series) and an industry first Purge and Trap tool for the popular CTC PAL systems.

Available models

CDS
CDS 7000E
Programmable time's
0 - 999.9 minutes
Trap
0.3 cm OD x 28.5 cm length
Transfer line
1.5m stainless steel clad fused silica, in flexible heated jacket.
Desorb pre-heat option
Yes
Valve oven
350°C
Transfer line
375°C
Wet trap
Wet trap
425°C
425°C
Desorption trap
425°C
Adsorbent trap
Vocarb or Tenax
Weight
8.6 kg
Dimension (W x H x D)
25 x 44 x 46 cm
Options
Heated Sparger Vessel
Electronic Mass Flow Controller
Electronic Mass Flow Controller

CDS's reliable Purge and Trap concentrator

The CDS-7000E was acknowledged as a workhorse in the industry for decades as the most cost-effective Purge and Trap concentrator. The 7000 E features our patented foam sensor, a newly redesigned wet trap for moisture control, and our original exchangeable sample pneumatics system, all providing the highest available performance and unrivalled chromatographic resolution.

Key features

  • Valve Oven Reaching as High as 350 °C
  • Silconert 2000 Coated Sample Pathway
  • Optional Soil Transfer Line
  • Hydroguard Wet Trap
  • Quick Access Panel
  • Patented Foam Sensor
  • Compatible with 5 ml and 25 ml Sparge Vessels
  • Powerful and User-Friendly PC Interface
CDS 7000C PAL System Purge and Trap Plugin
CDS 7000C
Programmable time's
0 - 999.9 minutes
Trap
0.3 cm OD x 28.5 cm length
Transfer line
1.5m stainless steel clad fused silica, in flexible heated jacket.
Desorb pre-heat option
Yes
Valve oven
350°C
Transfer line
375°C
Wet trap
Wet trap
425°C
425°C
Desorption trap
425°C
Adsorbent trap
Vocarb or Tenax
Weight
9.5 kg
Dimension (W x H x D)
18 x 50 x 33 cm
Options
Hot Water Rinse Module
Internal Standard Module
Internal Standard Module
Heated Sparge Vessle
Heated Sparge Vessle
Electronic Mass Flow Controller
Electronic Mass Flow Controller

World's first Purge and Trap tool for CTC PAL autosamplers.

The 7000C delivers the same combination of quality that made the 7000E such a reliable instrument, but with plug and play connectivity to the worlds leading autosampler platform - the CTC PAL Robotic systems. The 7000C features our industry standard foam sensor, a newly designed wet trap and our distinguished exchangeable sample pneumatics systems, all providing the highest available performance and unrivaled chromotographic resolution.

Key features

  • Valve Oven Reaching as High as 350 °C
  • Silconert 2000 Coated Sample Pathway
  • Plug and Play Connectivity with CTC PAL
  • Hydroguard Wet Trap
  • Quick Access Panel
  • Patented Foam Sensor
  • Compatible with 5 ml and 25 ml Sparge Vessels
  • Acquisition Software with Boosted Productivity
CDS’s2nd generation Purge and Trap autosampler (water only) with improved precision.
CDS 7350
Sample positions
72
Sampling volume
5 ml/25 ml
Internal standard
2 µl
Sample pathway
PEEK
Water mode
Yes
Soil mode
No
Soil heating temperature
-
Magnetic stirrer
-
Placement accuracy (3D)
1 mm
Weight
23 kg
Dimension (W x H x D)
56.9 x 48.2 x 62.2 cm
Options
-

CDS’s2nd generation Purge and Trap autosampler (water only) with improved precision.

The 7350 autosampler is a competitively priced, 72 position autosampler for EPA methods 524, 624 and 8260 waters, and built on our 2nd generation autosampler with a more precise handling for sample loading. A perfect match for the 7000 Purge & Trap concentrator.

Key features

  • 72 positions autosampler for 40 ml VOC vials in three separated racks
  • Equipped with a 5 ml reservoir for internal standard addition
  • Accommodate 5 mL (default) and 25 mL (optional) sample transfer
  • Position accuracy is improved by 50% to 1 mm (X, Y and Z) 3D placement accuracy due to a high precision drive mechanism
  • Alignment calibration in under 10 minutes
  • Extend the life of the system by using SMART acceleration control to lower the impact on the driving mechanism by 40%
  • The chemically inert sample pathway guarantees the success of your purge and trap testing even with challenging liquid samples
  • The sampling double-jacketed needle could be configured to reach the bottom of the VOC vial to perform multiple aliquots runs from the same sample
CDS
CDS 7450
Sample positions
72
Sampling volume
5 ml/25 ml
Internal standard
2 µl
Sample pathway
PEEK
Water mode
Yes
Soil mode
Yes
Soil heating temperature
80 °C
Magnetic stirrer
Speed adjustable
Placement accuracy (3D)
1 mm
Weight
24 kg
Dimension (W x H x D)
56.9
Options
Thermal desorption module

CDS's 2nd generation Purge and Trap autosampler for both water and soil samples.

The 7450 autosampler is a 72 position autosampler with dynamic headspace sampling function for EPA methods 524, 624 and 8260 (both water and soil), and built on our 2nd generation autosampler with a more precise handling for sample loading. A perfect match for the 7000E Purge & Trap concentrator.

Key features

  • 72 positions autosampler for 40 ml VOC vials in three separated racks
  • Equipped with a 5 ml reservoir for internal standard addition
  • Accommodate 5 mL (default) and 25 mL (optional) sample transfer
  • Equipped with a soil tower for dynamic headspace sampling in compliance with EPA 8260 soil samples
  • The soil tower is equipped with a water station to process water samples, and a separate  needle is used for soil samples to prevent carry over
  • The magnetic stirrer drives the magnetic bar in the soil vial based on EPA 5030 and 5035 sampling requirements for soil samples
  • Position accuracy is improved by 50% to 1 mm (X, Y and Z) 3D placement accuracy due to a high precision drive mechanism
  • Alignment calibration in under 10 minutes
  • Extend the life of the system by using SMART acceleration control to lower the impact on the driving mechanism by 40%
  • The chemically inert sample pathway guarantees the success of your purge and trap testing even with challenging liquid samples
  • The highly reliable VOC vial gripper has an optical sensor as a safety measurement to give you peace of mind when transferring samples to the soil tower.
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CDS AnalyticalCDS Analytical is a leading global provider of innovative thermal sample preparation instrumentation for the analytical laboratory. For over 35 years our exclusive focus has been on conceiving, designing, manufacturing, and supporting leading edge instruments. CDS offers a complete suite of diverse front-end GC equipment including pyrolyzers, purge and trap, headspace, and thermal desorption systems. These robust, field-tested products provide the entire range of temperature, heating rate, and multiple step manipulations required by today's most demanding analytical laboratories. With a well-established leadership role with pyrolyzers and other introduction systems, as well as broad market penetration on a global scale, CDS continues to be innovative and dynamic, and will pioneer the next wave of sample introduction instrumentation.
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