EPA Method 8111

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EPA Method 8111:
Haloethers by Gas Chromatography

Summary:
Samples are extracted and cleaned up (according to sample matrix) and the solvent appropriately exchanged. The samples are directly injected into a gas chromatograph where they are analyzed using a wide-bore capillary column and an electron capture detector.

Scope:
This method determines the concentration of haloethers in water, soil, and waste samples by using wide-bore open-tubular, capillary-column gas chromatography procedures while utilizing either single-column/single detector or dual column/dual-detector approaches.

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

Interferences:
(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 using this procedure, in which case, they must be reported as coeluting. The samples may be reanalyzed by GC/MS. Dichlorobenzenes are known to coelute with haloethers under certain conditions, in which case, it may be necessary to analyze the extract with two different column packings to resolve all of the compounds.(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.(D) Method interferences: Contaminants in solvents, reagents, glassware, and other sample processing hardware may lead to elevated baselines and/or other interferences in the gas chromatograms. Routine analysis of reagent blanks should be performed as a check for method interferences.(E) Refer to Methods 3500, 3600, and 8000.

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. In addition, refer to Method 8000, Section 8.0 for QC procedures on preparation and analysis.

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.

Media:
VARIOUS

Subcategory:
Organic

Concentration:
Not Available.

Sample Prep:
3500, 3510, 3520, 3600, 3620, 3640, 3660

Precision:
Precisions and accuracy values are based on the analyses of spiked sandy loam soils.

Detection:
None.

Revision Number:
Revision 0, December 1996