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A NEW SW-846 METHOD FOR THE ANALYSIS OF TOXAPHENE AND TOXAPHENE CONGENERS IN SOLID AND AQUEOUS SAMPLES USING GAS CHROMATOGRAPHY / NEGATIVE ION MASS SPECTROMETRY

Contact
SCOTT SIVERTSEN
phone: 7063558869
fax: 706-355-8857
email: sivertsen.scott@epa.gov

Description:

US EPA SW-846 methods have typically relied on dual column gas chromatography coupled with electron capture detection (GC-ECD) for analysis of low concentrations of organochlorine pesticides, including toxaphene, in environmental samples. Toxaphene is one of the most widely applied pesticides in the world and is a complex mixture of predominately polychlorinated camphenes estimated at 800-plus congeners. Once in the environment, toxaphene degradation begins. Weathered residues in environmental samples may not match laboratory standards. Adding to this complexity, degradation can result in metabolites not present in laboratory standards. To tackle the complexity of GC ECD toxaphene analysis, the US EPA is investigating an alternate determinative technique. The Agency is presently validating a method utilizing gas chromatography coupled with detection by low resolution methane negative ion mass spectrometry (GC NIMS) which uses scan or selected ion monitoring (SIM). Initial target analytes in the method are environmentally relevant toxaphene congeners as well as technical toxaphene. Using SIM, we were able to obtain congener limits of detection ranging from 0.00020-0.0026 µg/L for water and 0.0070-0.047 µg/kg for soils. This method is performance-based and allows for inclusion of other toxaphene congeners in extracts from solid and liquid matrices plus organochlorine pesticides routinely analyzed by Method 8081A.

Purpose/Objective:

The determination of toxaphene has typically been performed using GC-ECD. While GC-ECD is quite sensitive to electron-capturing species, it is also non-specific in its response, resulting in potential matrix interference. To tackle the complexity of GC-ECD toxaphene analysis, the US EPA is investigating an alternate determinative technique.

Record Details:

Record Type: DOCUMENT (PAPER IN NON-EPA PROCEEDINGS)
Start Date: 08/01/2008
Completion Date: 08/01/2008
Record Last Revised: 11/04/2008
Record Created: 10/29/2008
Record Released: 10/29/2008
OMB Category: Other
Record ID: 200297

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY
REGION 04
OFFICE OF REGIONAL ADMINISTRATOR
SCIENCE AND ECOSYSTEMS SUPPORT DIVISION
ANALYTICAL SUPPORT BRANCH

Citation:

SIVERTSEN, S. A NEW SW-846 METHOD FOR THE ANALYSIS OF TOXAPHENE AND TOXAPHENE CONGENERS IN SOLID AND AQUEOUS SAMPLES USING GAS CHROMATOGRAPHY / NEGATIVE ION MASS SPECTROMETRY. In Proceedings, National Environmental Monitoring Conference, WASHINGTON, DC, August 11 - 15, 2008.

URLs/Downloads:

NEMC PROCEEDINGS  Exit EPA's Web Site

 


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