EPA Method 8091

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EPA Method 8091:
Nitroaromatics and Cyclic Ketones by Gas Chromatography

Samples are extracted and cleaned up (according to sample matrix) and then are directly injected into a gas chromatograph to be analyzed by wide bore capillary columns with either an electron capture detector or nitrogen-phosphorous detector.

This method determines the concentration of nitroaromatics and cyclic ketones in water, soil, and waste matrices by using wide-bore, open-tubular, capillary column gas chromatography with either electron capture detection or nitrogen-phosphorus detection.

SW-846 Online: Test Methods for Evaluating Solid Waste, Physical/Chemical Methods

(A) Memory Interferences: Carryover may occur whenever high and low concentration samples are analyzed in sequence. For prevention, rinse the sample syringe between samples with solvent. Also, unusually concentrated samples should be followed by the analysis of a solvent blank. Additional solvent blanks interspersed with the sample extracts should be analyzed whenever a solvent blank indicates cross-contamination.(B) Coeluting Compounds: Some compounds coelute on either one or both columns, in which case, they must be reported as coeluting. The samples may be reanalyzed by GC/MS.(C) Electronegative Compound Interferences: Interferences may be caused by halogenated compounds, phthalates, and other oxygenated compounds, in which case, second column or GC/MS confirmation is necessary to ensure proper analyte identification.

QC Requirements:
Refer to Chapter One and Methods 8000, 3500, and 5000 for specific QC procedures. Procedures include: validation of sample preparation, introduction, and analysis, initial demonstration of proficiency, calibration verification, evaluation of retention times, analysis of method blanks, matrix spikes, duplicates, surrogates, and laboratory control samples.

Maximum Holding Time:
Aqueous samples - 7 days (sample), 40 days (extract). Solid samples - 14 days (sample), 40 (extract). Also, see SW-846 Chapter Four for information.



Not Available.

Sample Prep:
Methods 3500, 3510, 3520, 3600, 3620, 36

Precision and accuracy values are based on the analyses of 5 samples.


Revision Number:
Revision 0, December 1996