EPA Method 529

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EPA Method 529:
DETERMINATION OF EXPLOSIVES AND RELATED COMPOUNDS IN DRINKING WATER BY SOLID PHASE EXTRACTION AND CAPILLARY COLUMN GAS CHROMATOGRAPHY/MASS SPECTROMETRY (GC/MS)

Summary:
Analytes and surrogates are extracted by passing a 1 L water sample through a solid phase extraction (SPE) cartridge containing 500 mg of a divinylbenzene/vinylpyrrolidone copolymer or a 47 mm disk containing a reverse phase sulfonated polystyrene divinylbenzene phase. The organic compounds are eluted from the solid phase with a small quantity of ethyl acetate. The sample components are separated, identified, and measured by injecting an aliquot of the concentrated extract into a high resolution fused silica capillary column of a GC/MS system with a programmed temperature vaporizing (PTV) injector. Compounds eluting from the GC column are identified by comparing their measured mass spectra and retention times to reference spectra and retention times in a data base. Analysis may be performed using either full scan or selected ion monitoring (SIM) mass spectrometry. Reference spectra and retention times for analytes are obtained by the measurement of calibration standards under the same conditions used for samples. The concentration of each identified component is measured by relating the MS response of the quantitation ion(s) produced by that compound to the MS response of the quantitation ion(s) produced by a compound that is used as an internal standard. Surrogate analytes, whose concentrations are known in every sample, are measured with the same internal standard calibration procedure.

Scope:
This method provides procedures for the determination of explosives and related compounds in finished drinking water. The method may be applicable to untreated source waters and other types of water samples, but it has not been evaluated for these uses. The method is applicable to a variety of explosives that are efficiently partitioned from the water sample onto a solid phase extraction (SPE) sorbent, and sufficiently volatile and thermally stable for gas chromatography.

Test Description:
Explosives and Related Compounds in DW by Solid Phase Extraction and Capillary Column GC/MS