Method 1664A – Implementation and Use
Freon had been used exclusively as the extraction solvent for oil and grease analysis for decades. However, Freon is an ozone-depleting chemical. To protect the ozone layer, EPA developed method 1664A, which substituted n-Hexane as the extraction solvent. The HRSD CEL started to implement method 1664A in 2000 and completely switched by early 2006. Automated SPE has yielded quality results on a consistent basis. Only two OPRs failed for SGT-HEM and one OPR failed for HEM. 87% of matrix spikes were within the acceptance criteria. 1664A implementation studies indicated that significant amount of HEM and SGT-HEM loss with Freon procedure was through both extraction and evaporation processes. A historical data comparison between 1664A and the Freon method show that the results obtained from 1664A are comparable to the Freon method for some industrial discharges. However, for other industrial categories, differences may be significant. Overall recovery is improved using method 1664A.
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Document Type: Research Article
Publication date: 2008-01-01
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