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Uptake Rates for Tube-Type Axial Diffusive Samplers

Markes International Ltd
20 Jul 2015

This Application Note provides a listing of uptake rates for tube-type axial diffusive samplers, for a range of commonly used sorbents. Values are provided for hydrocarbons, halogenated compounds, esters, glycol ethers, ketones, aldehydes and alcohols, while separate lists are given for a few key compounds for exposure periods typical of workplace (8-hour) and environmental (24-hour to 4-week) monitoring scenarios.

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Sorbent sampling tubes

Markes International Ltd

Thermal desorption sorbent sampling tubes for air sampling. Backed up by fast and friendly service, Markes’ tubes provide optimum sampling and analytical performance. Our range includes everything from cost-effective packages of industry-standard tubes to the last word in sorbent tube innovation. Features: Our industry-standard (3½-inch (89 mm) long x ¼-inch (6.4 mm) o.d.) sorbent tubes are available in stainless steel, inert-coated stainless steel and glass. Compatible with thermal desorption instruments manufactured by Markes International, PerkinElmer and Shimadzu. All tubes are permanently labelled with a unique serial number, barcode and sampling flow arrow, so that they are easy to use and track. Further labelling options for tube tracking – includes laser-etching, banding and RFID-tagging (TubeTAG™). Diffusion-locking SafeLok™ options for additional peace of mind. Stringent quality control – our tubes are packed to a tolerance of ±2.5% or better. Application-specific sorbent tubes – optimally packed for applications ranging from air toxics to material emssions testing. Our sorbent tubes can also be ordered conditioned and capped, so that they’re ready for use on arrival. All our sorbent tubes can be supplied: empty for you to pack yourself (or for direct desorption); pre-packed with one sorbent bed for diffusive (passive) monitoring applications; or pre-packed with up to three sorbent beds for pumped (active) monitoring applications. We also supply 4½-inch DAAMS tubes (regular and high-flow, in any of the above materials) – contact us for details.

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Sample PreparationSample preparation can improve the quality and speed of separation techniques. Products to assist sample preparation include filtration equipment, evaporators, membranes and sieves.Labware and Lab SuppliesLabware and lab supplies include various forms of glassware, plasticware, reagents and personal protective equipment (PPE) and are used across all scientific laboratories, enabling daily tasks to be performed. Explore a range of flasks and beakers, petri dishes, carboys and storage bottles. Labware such as condensers, desiccators and burettes are also available for more specific tasks. Find the best labware and lab supplies in our peer-reviewed product directory: compare products, check customer reviews and receive pricing direct from manufacturers.Sample ManagementSample management systems include sample storage devices such as freezers and plate storers, sample environment enclosures and sample organization, retrieval and sorter systems. Useful system features include high-throughput, automation, robotic arms, automated liquid handling and associated database systems. Accessories in sample management include barcode scanners, heat sealers and tubes.Environmental Monitoring and TestingEnvironmental monitoring and testing uses handheld portable analyzers, kits, spectrometers or chromatography systems for air, water, soil, food and other sample testing. Useful features of analyzers such as BOD and COD include portability, easy calibration, automation and sensitivity.  Environmental test kits for pH, water, moisture, etc, should be accurate, sensitive, reliable, fast and easy to use.Safety EquipmentLaboratory safety equipment is essential to the effective operation of all laboratories and is required to minimize the risk of harm during experiments. Safety equipment includes radiation safety, radioactive / hazardous waste disposal, alarms and personal safety.Air SamplingAir sampling is described as the technique used to capture air for the subsequent purpose of analyzing, typically by thermal desorption, the presence of trace particulates, such as volatile organic compounds (VOCs).Laboratory SafetyLaboratory safety is essential to the effective operation of all laboratories and is required to minimize the risk of harm during experiments. Guidelines, regulations, and equipment should be available in all laboratories to ensure that the working environment is safe and secure.Environmental AnalysisEnvironmental analysis describes a variety of tests that determine the effect of chemicals, processes and particulates such as persistent organic pollutants (POPs) have on the environment.Sample ProcessingSample processing is required to prepare samples prior to analysis. Technologies used for sample processing include homogenizers, grinders, mills and mixers.Axial Diffusion

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