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For laboratories analyzing everything from air quality to flavors and fragrances, thermal desorption offers a faster, easier, more cost-efficient way to prepare samples for GC or GC/MS analysis. Ideal for the trace-level measurement of volatile organic compounds (VOCs)—as well as most semi-volatile chemicals—thermal desorption lets you avoid time-consuming, manual, solvent-based sample preparation in favor of a simple, streamlined, automated approach. It also delivers the added benefits of superior throughput and enhanced sensitivity.
In today’s budget-constrained, yet highly competitive laboratory environments, the samples you’re being asked to analyze - whether food, pharmaceutical, petrochemical, or environmental - are increasingly difficult. But for some labs, having a dedicated GC for every application isn’t an option. For them, a GC that can do it all isn’t just a nice-to have, it’s a necessity.
Pesticides can adversely affect human health through the food we consume but can also leach into soil and groundwater and impact us through the environment. To keep up with a complex and constantly changing regulatory environment, your pesticide analysis solution needs to keep up with your burgeoning sample load.
Although it was built for portability and speed, the low thermal mass (LTM) capillary GC provides equivalent chromatographic resolution and performance to a benchtop system. The miniature size is achieved by replacing a conventional convectively-heated column oven with a low thermal mass (LTM) column bundle with direct-contact electrical resistive heating. LTM GC uses a small diameter, metal capillary GC column, which is bundled with resistive heating and temperature-sensing wires that are braided Superior technology • Small diameter LTM capillary GC for high speed, high resolution separation of chemical analytes • Rapid temperature programming delivers analysis times of under three min. • Sensitive and selective mass-based detection of a wide range of chemicals • Easy to operate with a color touch-screen display and simple navigation buttons Figure 1. The Torion T-9 Low Thermal Mass Capillary GC is fast and operates reliably. Injection Port with Removable Liner LTM Capillary Column Bundle Cooling Fan Electronic Pressure Control GC Electronic Board together with insulator strands. This design provides for greater heating and cooling speeds and very low power consumption
The analysis of C2 to C12 volatile organic ozone-precursor compounds can present a serious technical challenge to the analytical chemist. Low concentrations in the atmosphere coupled with the need to monitor frequently to assess diurnal variations means that a preconcentration step of the sample before analysis by thermal desorption is required. While the samples can be collected in the field and returned to the laboratory, remote, field-based analysis is desired which allows reduced data turnaround time, minimizes sample collection hardware and permits the presence or absence of VOCs to be correlated with meteorological data. In the field, low-molecular-weight C2 VOCs can be trapped on solid adsorbents if those adsorbents are cryogenically cooled.
As an alternative to tetraethyl lead, t-Butyl methyl ether (MTBE) has been widely used as an octane enhancer for gasoline. Studies have found increasingly high levels of MTBE in groundwater, often a result of accidental spills or leaking underground storage tanks. In this paper, a method for the determination of MTBE in water and soil was established using the PerkinElmer Clarus® 690 GC/FID with the TurboMatrix™ HS-40 Trap.
This application note presents a fast and robust liquid chromatography method to simultaneously test nine widely used additives. Among the additives tested are: preservatives (benzoic acid, sorbic acid, dehydroacetic acid and methylparaben); artificial sweeteners (acesulfame potassium, saccharin and aspartame); flavoring agent (quinine); and a stimulant (caffeine).
This analysis focuses on the detection of trace level semi-volatile organic compounds in extracts from solid waste matrices, soils, air sampling media and water samples. The method lists over 200 compounds however a majority of laboratories target between 60 and 90 for most analyses. The study presented here demonstrates the PerkinElmer® Clarus® SQ 8 GC/MS, not only meets the method requirements but provides users flexibility to satisfy their individual productivity demands. An extended calibration range is presented as are the advantages of the Clarifi™ detector.
Volatile Organic Compounds (VOCs) have been identified as a major source of air pollution, and as such, have been regulated as a cause of both primary and secondary pollution, such as photochemistry smog. The U.S. Environmental Protection Agency (U.S. EPA) regulates 189 hazardous air pollutants under the Clean Air Act (CAA) of 1990, 51% of which are VOCs. The CAA offers further regulation and guidance for the monitoring of VOCs and ozone pollution in ambient air with a list of 57 ozone-precursor target analytes monitored under U.S. EPA’s Technical Assistance Document for Sampling and Analysis of Ozone Precursors, EPA/600-R-98/161 (1998)1, as well as the requirement of states to establish Photochemical Assessment Monitoring Stations (PAMS). This paper details an application for VOC monitoring with an extended target compound list utilizing a PerkinElmer TurboMatrix™ 300 TD and PerkinElmer Clarus® 580 GC. The application note demonstrates results with good repeatability, linearity and detection limits.
Liquid chromatography-tandem mass spectrometry (LC/MS/MS) has become the method of choice for pesticide The state of Oregon has issued regulatory limits for 59 pesticide residues in both cannabis flower and concentrates, while other states have come up with
The synthesis of active pharmaceutical ingredients (API) may require multiple reaction steps that produce undesirable reaction byproducts or utilize various solvents that have to be removed from the finished product. These solvents and byproducts may be measured with headspace gas chromatography for those volatile residual organic solvents according to the USP chapter 467 method. Method USP 467 classifies residual solvents into three classes according to toxicity; class 1 solvents are to be avoided unless there is strong justification, class 2 solvents are those that should be limited due to toxicity concerns.
Chlorophenols are by-products of the drinking water purification process and are also widely used as wood preservatives, herbicides and pesticides. In this study, the derivatization and extraction happened in the headspace vials during the vial thermostatting step. The derivatization reaction is affected by temperature and time, therefore the thermostat time and oven temperature of the headspace sampler were investigated for optimum derivitization/extraction conditions.