Determination of 1,2-Dibromoethane and l,2-Dibromo-3-chloropropane in Water by Microextraction and Gas Chromatography: Collaborative Study

Abstract

Abstract A collaborative study of U.S. Environmental Protection Agency (EPA) method 504 for the determi nation of 1,2-dibromoethane (EDB) and 1,2-dibromo-3-chloropropane (DBCP) in aqueous samples by microextraction using gas chromatography with an electron capture detector was conducted by EPA, Environmental Monitoring Systems Laboratory, Cincinnati, OH. Ten volunteer laboratories reported data for 6 concentration levels in each of 2 water matrixes: reagent water and groundwater. The method was tested over the concentration range of 0.050–6.70 μg/L. Generally, the between-laboratory relative standard deviation ranged from 6–22%, and the withinlaboratory relative standard deviation ranged from 4–10%. The microextraction/gas chromatographic method for determination of EDB and DBCP in water has been adopted first action by AOAC INTERNATIONAL.