Air Monitoring / Soil Vapor Intrusion

PAMS & Air Toxics (TO Methods) Sampling

Entech's Silonite™ technology is at the heart of our 1800 dual channel sampler. Unpassivated stainless steel sampling systems can result in compound losses in excess of 80% in down the pipe studies. Only Entech's Silonite™ coated stainless steel flow path makes a sampler as inert as Entech's Silonite™ coated stainless steel canisters. more...

PAMS, Air Toxics (TO Methods) & Soil Vapor Analysis

Entech's Silonite™ technology is at the heart of our 7100A Preconcentrator. The ultra inert flowpath is ideal for PAMS, TO14 & TO15. So inert, even formaldehyde (a TO15 listed compound) can be recovered and analyzed from Entech's Silonite™ coated stainless steel canisters, without dirivization. This can eliminate the need for separate TO11 sampling and analysis. more...

Landfill Gas

Landfill gas can be collected and analyzed using Entech MiniCan samplers. "No pump" sampling is performed using the self-contained vacuum in the MiniCan, which considerably simplifies the sampling process relative to Tedlar bags. Sample holding times are up to several weeks due to the dense, inert Silonite™ coating used to line the inside of MiniCans.

Soil Gas

Soil gas samples can be collected in Entech MiniCans to determine concentrations of organic compounds and solvents which could ultimately end up in water supplies without redemption. MiniCans are compatible with all soil probes from Entech. Solvent Enhancement Enclosure (SEE) can also be used to concentrate surface gases before sampling.

Sulfur Analysis

Sulfur compounds can be collected in Silonite™ coated stainless steel canisters and stored up to several weeks without significant loss while awaiting analysis. Evacuated canisters are easy to use, eliminating the need for power during the sampling process. Sample collection can be performed quickly (grab sample) or over a several hour period to find average concentrations. If required detection limits are in the high PPB to PPM range, Canisters can be analyzed using loop injection sample introduction into GCs with sulfur specific detectors. For low and sub-PPB level measurements, the 7100 Preconcentrator can concentrate up to 1000 cc of sample, allowing detection by either sulfur specific detectors or by mass spectrometry. Most sulfur compounds can be monitored down to or below their odor threshold.

MiniCans have quick connect fittings that reduce the time needed to make connections to samplers, analyzers, and cleaners, especially when large numbers of samples are involved. The rugged construction makes the MiniCan ideal not only for environmental sampling, but also as a replacement for more fragile glass bottle samplers and absorptive Tedlar bags used in refineries and chemical research facilities.

Example Chromatograms

Process Monitoring - Volatile Sulfur in Process Gas

Sulfur gases are a byproduct of petroleum refining and must be monitored in many product, waste, and exhaust streams. Stack emission of sulfur compounds can lower pH of surrounding streams and lakes through the generation of acid rain. Transmission of sulfur compounds in feed streams to petrochemical refining operations can result in shortened catalyst lifetimes due to the poisoning effect brought on by sulfur compounds.

Entech has developed a new coating called Silonite™ that allows sampling cylinders to collect and store process gases for later analysis of their sulfur content. Hydrogen sulfide, COS, Mercaptans, and Sulfides are all stable in these coated stainless steel vessels to fully eliminate contact with the underlying stainless steel.