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.
Pyrolysis is a thermal decomposition process of organic material at elevated temperatures in an anaerobic environment. It involves the cleavage of large complex molecules into smaller, more analytically useful fragments by the thermal energy.As an analogy, 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 comparable to 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 Analytical released the first commercial analytical pyrolyzer (Model 100) in late 60s, and has been proudly making world’s best pyrolyzers for over 50 years. Our products have evolved through 6 generations and represent the industries highest standard. CDS pyrolyzers can be used in universities, forensic labs, labs, government settings, and more for all your polymer research needs. They are also compatible with all major brands of GC/MS including: Agilent, Bruker, Thermo, PerkinElmer, and Shimadzu.
Purge and Trap:
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.
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 VOC’s 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 compounds 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.)
Distributor Resmi Indonesia
Company: PT. Saranalab Mandiri Analitika
Phone : 021 82736962