A Summa canister is a stainless steel container that has had the internal surfaces specially passivated using a “Summa” process. This process combines an electropolishing step with a chemical deactivation step to produce a surface that is nearly chemically inert.
How do you collect soil gas samples?
Soil gas samples should be collected in areas above where volatile chemical contamination in the soil or groundwater has been identified. Soil gas samples must be collected from a depth at least three feet below the ground surface or building foundation, but above the saturated zone.
How do you use a Tedlar bag?
Open the plastic valve on the Tedlar bag slowly and fill the bag until it is about half full. Close valve and disconnect the bag. Label the bag with the sample identification and other information desired. Keep bags out of sunlight to present degradation of the sample.
What is Silonite?
Silonite™ is a ceramic coating treatment developed by Entech to provide an extremely inert surface for chromatography applications. Silonite™ creates an ultra-smooth surface which reduces the potential for chemical adsorption.
How is soil-gas measured?
A Gas Vapor Probe provides the most scientific method for measuring soil gases.
What is soil-gas survey?
Soil-gas surveys are defined as the collection, analysis, and interpretation of soil-gas data. Passive soil-gas surveys take several days or weeks to complete and are most useful where semivolatile organic compounds (SVOCs) are suspected or when soils prevent sufficient air flow for active sampling.
Can Tedlar bags be reused?
Yes, it is possible to reuse bags for some applications. evacuated and thoroughly cleaned and flushed after each use with purified air or nitrogen before reuse.
What are Tedlar bags?
Tedlar Sampling Bags Sampling bags are a low-cost, whole-air sampling device for high-level VOCs and permanent gases. Several EPA, NIOSH, and OSHA methods exist for bag sampling for a variety of applications: stationary sources emissions; workplace atmospheres; ambient, indoor air quality; and breath analysis.
What is a summa canister?
What are Summa Canisters? A Summa canister is constructed of specially treated stainless steel designed for collecting a whole air sample. Compared to Tedlar® bags and Sorbent Tubes, a Summa canister is far superior to use and does not require a separate pump.
Why choose branded safe storage boxes for Summa canisters?
Unique to the industry our branded safe storage boxes provide peace of mind that your summa canister will be protected during transportation from your site to our laboratory. What are Summa Canisters? A Summa canister is constructed of specially treated stainless steel designed for collecting a whole air sample.
What are the manufacturing challenges of the Summa® nicrox canisters?
SUMMA® manufacturing challenges: The NiCrOx canister coating quality is subject to bath degradation from increased levels of iron released from previous canisters. In addition, glycols used in the bath are difficult to completely remove from the surface, creating aldehyde and alkene breakdown products to appear over time.
How is the canister prepared for sampling?
The canister is prepared for sampling by evacuating the contents to a vacuum of approximately 29.9 inches of Mercury (in Hg). Opening the stainless steel bellows valve allows the air sample to enter the canister. Flow controllers can be utilized to restrict the flow and allow for collection at a desired flow rate or over a desired range.
