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Improved Performance And Dynamic Range For EPA Method TO-15 using the Entech 7200 and Agilent 7890B/5977 GCMS
Canister sampling and analysis for measurement of volatile chemicals is finding use in a growing number of diversified applications. This has required air laboratories to accommodate an even wider dynamic range of sample concentrations, and a growing list of compounds to include those once thought to be incompatible with canister sampling techniques. New materials for the internal lining of canisters and field sampling systems, as well as laboratory analyzers optimized using 3D Computer Assisted Design software have provided the improved performance needed to meet these challenges.
A new Air Toxics TO-15 Analyzer based on the Entech 7200 Preconcentrator and Agilent 7890B/5977 GCMS system is demonstrated here which improves productivity and analytical accuracy. Every aspect of the sample preparation process has been optimized to improve linearity, recovery, sensitivity, and dynamic range. Linear calibrations that meet TO-15 criteria are now possible over a dynamic range of 100-2000 fold, reducing the number of dilutions necessary, while lowering detection limits to meet today’s State driven Low Level TO - 15 Method requirements . Improvements in recovery and linearity also reduce the downtime previously caused by systems that were only marginally meeting required method linearity criteria. The following application note will describe the new advancements in the 7200/7890B/5977 TO15 Analyzer that have resulted in a dramatic improvement over prior technology.
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