Time integrated sampling of TO14 compounds into stainless steel canisters was evaluated under a variety of conditions. Four different flow controllers were tested at temperatures ranging from 4 deg. C to 40 deg. C to determine how well they maintained a constant flow rate despite changes in ambient temperatures. The three flow controllers with fixed restrictors maintained a relatively constant flow rate over the temperatures tested, while the flow controller with a variable flow restrictor showed an increase in flow of 1300% as the temperature was raised from 4-40 deg. C. The effect water has on recovery was also studied by sampling under dry conditions (RH=10%) and more normal conditions (RH=50%).
Finally, individual parts that make up a passive canister sampler were evaluated to determine how each affects the recovery of TO14 analytes. Recoveries increased as flow path cleanliness improved and adsorptive surfaces were eliminated. The greatest improvements in recovery were obtained by electropolishing the inside of inlet tubing, and by replacing the 2um stainless steel inlet filter with a deactivated glass frit.
This is the complete Entech 2018 Catalog. You can download the PDF or use our Flipbook viewer (below) for a smoother experience. Please note that not all sampling products are included. The Entech store is the best place to find photos and descriptions of every product we carry.
Entech’s Silonite™ (Silonite™ VS Summa) canisters feature a large volume capacity for detection of volatile chemicals down to the low part per trillion range. An inert and durable internal Silonite™ coating provides a high-quality, long-term sample storage solution. Losses in the valve are avoided by using our new Toxic Organics Valve™ (TOV-2™) which includes Entech’s new “sure-seal” technology and low carryover, replaceable nickel ferrules. An integrated valve guard is securely welded to the canister for superior light-weight valve protection without any stresses to the valve stem associated with heavy “strapped-type” valve guards. These canisters are certified to meet or exceed the technical specifications required for EPA methods TO-14a and TO-15. High-quality performance is verified for EVERY canister with our demanding chemical inertness tests.
MiniCansTM are the next generation of air sampling canisters from Entech. Designed for tool-free operation and advanced robotic analyzers, Silonite® treated MiniCans™ allow the recovery of a wider range of compounds than any other sampling canister – including semi-volatiles up through the full diesel range and C25hydrocarbons.
More and more attention is now being given to monitoring levels of volatile chemicals from PPM down to sub-PPB levels, as chronic exposure even at low levels may lead to a number of different health conditions, including cancer.
Volatile and Semi-volatile chemicals both in our outdoor and indoor air must be considered in determining overall human exposure.Measurement of these chemicals in air is usually performed by Gas Chromatography / Mass Spectrometry to quantify concentration levels of individual compounds to determine the overall exposure risks.
Usually, levels are too low for direct GCMS detection, requiring sample enrichment or pre-concentration for detection down to PPB (parts per billion) and sub-PPB levels. “Whole Air” field collection of air samples into inert canisters continues to be the Gold Standard for obtaining accurate air monitoring results, using evacuated containers which are opened in the field to collect the air sample, followed by laboratory analysis under reliable and controlled conditions.
Alternative approaches using thermal desorption tubes modify the sample in the field, exposing the collected chemicals to a more reactive environment which often results in inconsistent recovery during thermal desorption in the laboratory.
Entech is the world leader in providing canister monitoring technology based on US EPA Methods TO-14A and TO-15. Virtually hundreds of volatile and semi-volatile compounds can be recovered using this approach, making canisters the most universal technique for measuring virtually every GC compatible airborne compound of interest. Entech places a proprietary ceramic called Silonite™ on the inside of sampling canisters to make them extremely inert, allowing the recovery of more compounds than any other air sampling device.
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