Innovative Chromatography Products
To help labs improve analytical speed and accuracy, Restek has developed LC columns and instrument conditions that reliably provide baseline separation of commonly analyzed DNPH derivatives of aldehydes and ketones in air samples in just minutes. Using these products and procedures assures fast, accurate determination of aldehydes and ketones in air and offers an opportunity for improved sample throughput compared to typical methods.
This issue of Airmail includes a fast, sensitive analysis of TO-15 volatiles on a 30 m column, as well as an update on opportunities for air labs to collaborate with the EPA to meet Agency measuring and monitoring needs. Also features Tedlar bags. (PDF - 867kB)
This issue of Airmail includes a 16 min GC analysis of TO-15 volatiles on a 30 m column, as well as an update on EPA guidance documents on vapor intrusion. Also features gas standards. (PDF - 1025kB)
This issue of Airmail discusses the increasing interest in testing volatile methylsiloxane (VMS) compounds in biogas using a new whole air canister-based GC-MS method developed for trimethyl silanol (TMS). Also features an air sampling canister weight comparison. (PDF - 1073kB)
This 4-page newsletter includes an update on possible changes to the U.S. EPA Photochemical Assessment Monitoring Stations (PAMS) program, as well as a new single column method for PAMS testing that can significantly simplify analysis. Also features tips on extending canister lifetime and information on the powerful TO-Clean high-capacity canister cleaning system. (PDF - 624kB)
Quickly and precisely verify flow rates generated by vacuum or pressure before going into the field. These compact, convenient units are ideal for real-time calibration of air flow controllers, passive sampling kits, air canisters, sampling pumps, and more. (PDF - 701kB)
Despite the growing popularity of electronic cigarettes, relatively little work has been done to characterize their vapor. In this study, we developed a quick, simple thermal desorption device for sampling vapor, as well as methods for analyzing vapor and solutions to determine nicotine content (GC-FID) and impurity profiles (GC-MS). This novel approach, which utilizes an Rtx-VMS column, provides detectable levels of volatile organic compounds (VOCs) and semivolatile organic compounds (SVOCs) from a single 40 mL puff. (PDF - 873kB)
The Aura personal air sampler from Restek is setting a brand new benchmark in sampling technology. This innovative passive sampling device is designed to meet OSHA and NIOSH requirements, while overcoming the limitations of sorbent tubes and badges. The Aura sampler offers broader utility and a wider effective range with no risk of breakthrough. (PDF - 1143kB)
Confirming sample port integrity with a leak detector is a simple, cost-effective alternative to lab analysis of tracer gas in vapor intrusion VOC samples. Prevent resampling of soil vapors by confirming sample port integrity in the field prior to sampling.
Early detection of structural mold is critically important to protecting human health and property values. Restek SilcoCan™ canisters allow low levels of microbial volatile organic compounds (MVOCs) to be detected in air samples before mold can be seen, providing an opportunity for structural repair and safer living conditions. The inertness of these canisters provides an exceptional storage environment, particularly for polar and high boiling point compounds.
Gas sampling bags can be a cost-effective alternative to canisters and thermal desorption tubes for many air monitoring applications, including VOCs and permanent gases. This 4-page flyer provides general guidelines, product specifications, and recommended applications. (PDF - 953kB)
Ambient air sampling involves collecting a representative sample of ambient air for analysis. There are two general approaches: 1) “whole air” sampling with canisters or Tedlar bags and 2) “in-field concentration” sampling using sorbent tubes or cold traps. In this guide, we focus on collecting whole air samples in canisters, a flexible technique with many applications. (PDF - 1408kB)
Cut cleaning time in half with a TO-Clean air canister cleaning system. This high-capacity unit hold twice as many air cans as similar products and is fully automated and easy to use. You can create and save custom cleaning programs that ensure consistency and make operation as easy as pressing start and walking away. (PDF - 930kB)
Labs analyzing VOCs in air can nearly double sample throughput while meeting all Method TO-15 performance requirements by adopting Restek’s short column approach. As shown here, the use of an Rxi-5Sil MS column (30 m x 0.32 mm ID, 1.00 µm) allows all requirements to be met in almost half the time required by typical 60 m setups. (PDF - 984kB)
The NJ Low Level TO-15 air testing method is based on U.S. EPA Method TO-15, but it has some differences that make it quite challenging. The broader calibration range (0.2–40 ppbv) is particularly difficult to meet. In this application note, we focus on the method’s analytical requirements and demonstrate how to meet them using a Markes Unity with CIA Advantage and a 30 m Rtx-VMS column.
VOC testing laboratories can expand into new markets using existing air sampling canisters and thermal desorption tubes, due to the broad applicability of these techniques.
Optimize Analysis of Polar and Coeluting VOCs in Whole Air Canister Samples Using an Rtx®-VMS GC Column
Since Method TO-15 is a performance-based method for analyzing VOCs in whole air canister samples, labs have the option to use any GC column that meets performance criteria. Shorter columns can be used to reduce analysis times and stationary phases that separate difficult coelutions can be selected. After evaluation of a wide variety of columns, the Rtx®-VMS column offers the best overall performance and is particularly recommended when polar or coeluting compounds are included in the list of target analytes.
The efficacy of using a Nutech preconcentrator and a 30 m analytical column for VOC analysis of air samples according to Method TO-15 was evaluated. Results demonstrate that method criteria were easily met and in much faster analysis times than typical methods based on 60 m columns.
Introduce your air sampling canisters to Restek air valve excellence (RAVE). RAVE valves feature proven long life, leak-free performance, and effortless operation. Now standard on our full line of SilcoCan, TO-Can, and miniature air cans, these newly redesigned valves are also great for upgrading existing canisters. Now also available: RAVEn valves for Entech cans! (PDF - 2389kB)
This 4-page newsletter includes an analysis of Massachusetts DEP air-phase petroleum hydrocarbons, as well as an update on the U.S. EPA Photochemical Assessment Monitoring Stations (PAMS) program. Also features Tedlar bags and air canisters. (PDF - 774kB)
Restek-exclusive Ultra-Clean resin is a great alternative to XAD-2 resin for sampling semivolatiles. Learn more about how our GC-tested resin, as well as our polyurethane foam (PUF) plugs, can help you with your ambient, indoor, and industrial hygiene air-sampling applications. (PDF - 656kB)
TO-Can air sampling canisters are electropolished and extensively cleaned, to provide a high-quality, passivated surface for improved stability of analytes listed in USEPA Method TO-15 (ambient air monitoring). For reactive compounds, such as sulfur-containing components, SilcoCan canisters are your best choice our exclusive Siltek® surface treatment ensures exceptional inertness and maximum sample stability, even for 1-20ppb sulfur compounds.
Restek offers sampling options for every thermal desorption application, including grab and time-integrated sampling, single-tube pumps, multi-tube sequential samplers, and manual or battery-operated powered units. (PDF - 1102kB)
Air sampling canisters from Restek are durable, easy to use, and highly inert. They weigh just grams more than canisters from other vendors and cost the same to ship. Check out this weight and cost comparison to see for yourself! (PDF - 1795kB)
Restek offers Rocker and Chemker vacuum pumps and accessories. Perfect for a wide range of applications, these pumps are quiet, reliable, and available in oil-free and chemical-resistant options (PDF - 883kB)
Storage Stability of 66 Volatile Organic Compounds (VOCs) in Silicon-Lined Air Canisters for 30 Days
The recoveries of 66 volatile organic compounds (VOCs) typically analyzed as part of the EPA Method TO-15 were evaluated for two commercially available silicon-lined (SL) air canisters. For the majority of the 66 VOCs, there were no appreciable differences in recoveries and stabilities between the canisters for both dry and humid conditions over 30 days of storage. Acrolein, dibromochloromethane, and bromoform were the only three compounds that appear to be unstable in both SL canister types; however, only under the humid (93% RH) condition.
This flyer give an overview of TD sampling and describes many applications that can be sampled using this versatile technique. Includes a comparison of tube and canister sampling, to help you determine which VOC sampling technique is best for you. (PDF - 177kB)
Thermal Desorption: A Practical Applications Guide: I. Environmental Air Monitoring and Occupational Health & Safety
Thermal desorption is now recognized as the technique of choice for environmental air monitoring and occupational health and safety. This 28-page publication from Markes International Ltd. presents several real world thermal desorption applications. (PDF - 1137kB)
Thermal Desorption: A Practical Applications Guide: II. Residual Volatiles & Materials Emissions Testing
Thermal desorption is a convenient, fully automated alternative to solvent extraction for measuring residual volatiles. This 32-page publication from Markes International Ltd. details the testing of a wide variety of products using thermal desorption. (PDF - 1480kB)
Whole Air Canister Sampling and Preconcentration GC-MS Analysis for pptv Levels of Trimethylsilanol in Semiconductor Cleanroom Air
Issues with trimethylsilanol scanner haze and optics haze have created a need for trace-level methods in the semiconductor industry. The whole air canister-based GC-MS method developed here couples pptv level sensitivity with near instant grab samples, allowing for the rapid screening of cleanrooms.