CDS Analytical

CDS Analytical, LLC. has been a leader in the design and manufacture of laboratory instruments for sample preparation and analysis for four decades. Best known in the field of analytical pyrolysis, CDS has supplied instrumentation for a wide range of additional analyses including catalyst screening, reaction optimization, organic headspace analysis, and environmental testing.
Incorporated as Chemical Data Systems, Inc., CDS introduced its first product, the Pyroprobe, in 1969. The Pyroprobe was used with pyrolysis-gas chromatography to analyze solids. In 1977, CDS produced the 310 Sample Concentrator, a manual purge and trap instrument for environmental analysis. Later we introduced the first microprocessor controlled purge and trap instrument, the CDS Model 320. By the mid-1990s CDS recognized the need for laboratory automation and developed the AS-2500 Pyrolysis Autosampler.
At the start of the new Millennium, CDS Analytical, Inc. and Dynatherm Analytical Instruments Inc. combined forces, adding additional thermal sampling instrumentation to the CDS product line. Dynatherm instruments provide laboratory personnel with the means to collect trace organic chemicals from air, water, and soil samples, as well as diverse food products such as coffee, grains, juices, chocolate, flavorings, and their packaging materials.
In years to come CDS Analytical will continue to support customers by developing the next wave of sample introduction instruments.
For more information please visit CDS Analytical

Instruments

  • Why Pyrolysis
    Pyrolysis, coupled with GC (Py-GC), GC/MS (Py-GC/MS), Direct MS or FT-IR, permits the analysis of samples which were previously unsuitable for analysis without lengthy extractions or derivatizations.
    What is Pyrolysis?
    Pyrolysis is simply the breaking apart of large complex molecules into smaller, more analytically useful fragments by the application of heat.
    When a Mass Spectrometer shatters compounds using electron impact, the compound is fragmented in a reproducible way, the ions are separated by the MS and the result is a spectrum which is both qualitative and quantitative. Pyrolysis works in much the same way. By applying heat to a sample that is greater than the energy of specific bonds, the molecule will fragment in a reproducible way. The fragments are then separated by the analytical column to produce the chromatogram (pyrogram) which contains both qualitative and quantitative information. The number of peaks, the resolution by capillary GC, and the relative intensities of the peaks permit discrimination among many similar formulations, making pyrolysis a powerful tool in the identification of unknown samples.
    CDS pyrolyzers can be used in university, forensic labs, labs, government settings, and more for all your polymer research needs. They are also compatible with all major brands of GCMS including: Agilent, Bruker, PerkinElmer, and Shimadzu.
  • Why Thermal Desorption
    Thermal desorption encompasses two primary functions; sample collection/concentration, and transfer to a detector.
    The use of adsorbents and large sample volumes to collect vapor phase compounds, (such as pollutants in air or residual components from solids), facilitates accurate analysis even when sample levels are very low.
    Organics are concentrated on sorbent media while the sample matrix, air or water, is discarded. In much the same way as a vacuum cleaner filters dust from air as it sweeps over a surface, Dynatherm instruments capture compounds of interest on adsorbent material packed in glass cartridges. Collected chemicals are then introduced into another analytical instrument, typically a gas chromatograph, where they are separated, measured, and identified.
    Thermal desorption uses heat, (instead of solvent extraction), to release organic compounds from the adsorbent and transfer the entire collected sample to a gas chromatograph for analysis. This eliminates extraction time, (typically 12-24 hours), a solvent peak in the chromatogram (which can mask compounds of interest), and waste solvent disposal, an increasing expense in many labs.
    The process is flexible and convenient. For example, an investigator equipped with a battery-powered sampler can quickly collect liters of air on a sorbent tube and bring it to the lab for analysis. Alternatively, the thermal desorber/GC instruments can be mobilized for direct source sampling in the field.
    When samples are collected in areas of high humidity, two-stage sorbent trapping and thermal desorption effectively eliminate water interferences and enhance analysis of polar compounds in the sample stream. (Other collection techniques, such as canister sampling, must limit sampling volumes to control the amount of water transferred to the GC, which tends to lower sensitivity as well as restrict recovery of polar compounds.)
  • Why Purge & Trap
    Purge-and-trap is the ideal method for extracting and concentrating volatile organic compounds (VOCs) from liquids & solids for analysis by GC or GC/MS. The US EPA specifies environmental methods utilizing purge-and-trap for the analysis of VOCs from soil, sediment (SW-846 method 8260), and water samples EPA methods 524 and 624). The technique can also be used to extract VOCs from foods and beverages.
    This procedure is particularly useful for concentrating VOCs that are insoluble or poorly soluble in water and have boiling points less than 200C. The purge-and-trap procedure involves purging a sample with an inert gas, such as nitrogen or helium at ambient temperature (water) or slightly elevated temperatures (soil). This liberates the VOCs, which are efficiently transferred from the aqueous (or solid) phase to the vapor phase. During this purge step, the inert gas is swept to an analytical trap containing a solid sorbent which retain the VOCs. The trap is then desorbed and the VOCs are transferred to the GC for analysis.
  • Why Dynamic Headspace
    Headspace sampling is a means of introducing volatile compounds associated with a sample material without the use of solvent extraction. In static headspace, the sample is sealed into a vessel, warmed, and then a sample of the atmosphere surrounding the sample is withdrawn and injected into the injection port of the GC.
    Dynamic headspace sampling is a technique which uses a flow of carrier gas through the sample vessel to increase the headspace sample size, and thus the sensitivity of the technique. Instead of allowing the sample to come to equilibrium in a sealed container, the sample is warmed and the headspace atmosphere is constantly purged out of the sample vessel and through a trap.
    Here the analytes are collected, as in a purge and trap analysis, while the carrier gas is vented. After the collection step, the trap is heated and backflushed to transfer the adsorbed compounds to the GC for analysis. Since no solvents were used to prepare the sample for the GC, there is no solvent peak, no dilution of the compounds of interest, and no waste solvent to discard.
  • Pyroprobe 5000
  • Pyroprobe 5150
  • Pyroprobe 5200
  • Test Tube Desorber Accessory 5200
  • Pyroprobe 5200 High Pressure Reactor
  • AS 5250 Pyrolysis Autosampler
  • 5250T Trapping Pyrolysis Autosampler
  • Accessories
  • Thermal Desorption Autosampler 7500
  • ACEM 9300 Series
  • ACEM 9350
  • A/DAM-SVS Agilent/Dynatherm Agent Monitor
  • Tube Conditioner
  • CDS 8000
  • CDS 7000 E
  • CDS 7300 Autosampler
  • CDS 7400 Autosampler
  • CDS 7500 Autosampler
  • CDS 8000
  • Dynamic Headspace Vessels
  • 8400 Autosampler
  • 5500 Fixed Gas Analyzer