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Modified Active Gas Sampling (MAGS) is an environmental engineering assessment technique which rapidly detects unsaturated soil source areas impacted by volatile organic compounds. The technique was developed by HSA Engineers & Scientists in Fort Myers, Florida in 2002, led by Richard Lewis, Steven Folsom, and Brian Moore.
A sample is continuously extracted from the gas stream being monitored using a titanium probe, which is water-cooled to below 70 °C. The sample flow rate is automatically adjusted to ensure isokinetic sampling (the velocity of gas entering the sampling system is equal to the velocity of the gas in the system under test).
A residual gas analyzer (RGA) is a small and usually rugged mass spectrometer, typically designed for process control and contamination monitoring in vacuum systems.When constructed as a quadrupole mass analyzer, there exist two implementations, utilizing either an open ion source (OIS) or a closed ion source (CIS).
Standards from the American Petroleum Institute (API) 14.1 and the International Organization for Standardization (ISO) EN10715 provide guidance for gas sampling for either laboratory or online analyzers of gas streams. They also offer guidelines for managing high-pressure gases to prevent liquid dropout in the sample system during pressure ...
The carrier gas flow is not interrupted while a sample can be expanded into a previously evacuated sample loop. Upon switching, the contents of the sample loop are inserted into the carrier gas stream. P/T (purge-and-trap) system – An inert gas is bubbled through an aqueous sample causing insoluble volatile chemicals to be purged from the matrix.
The hardware (traditionally metal tubing, compression fittings, valves, regulators, rotameters and filters) associated with extractive sampling is collectively referred to as the sampling system. Sample systems are used to condition or adjust the sample conditions (pressure, amount of particulate allowed, temperature and flow) to a level ...
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