NEMI Method Summary

Method Summary Information

Method Number: 8081B Media: VARIOUS
Revision: Revision 2, November 2000
Method Source: U.S. EPA Office of Solid Waste
Subcategory: ORGANIC Analytes in this method
Official Name: Organochlorine Pesticides by Gas Chromatography
Descriptive Name Organochlorine Pesticides by GC-ECD
Source Info: U.S. EPA Office of Solid Waste (OSW) Methods Team
Ariel Rios Bldg. (5307W)
1200 Pennsylvania Ave. NW
Washington, DC 20460
Phone: 703-308-8855
Fax: 703-308-0511
Citation: SW-846 Update IVB
155545 Byte file
Brief Method
Summary:
 A measured volume or weight of sample (approximately 1 L for liquids, 2 to 30 g for solids) is extracted using the appropriate matrix-specific sample extraction technique. A variety of cleanup steps may be applied to the extract, depending on the nature of the matrix interferences and the target analytes. Suggested cleanups include alumina (Method 3610), Florisil (Method 3620), silica gel (Method 3630), gel permeation chromatography (Method 3640), and sulfur (Method 3660). After cleanup, the extract is analyzed by injecting a measured aliquot into a gas chromatograph with either a narrow-bore or wide-bore fused-silica capillary column, and either an electron capture detector (GC/ECD) or an electrolytic conductivity detector (GC/ELCD).
Scope And
Application:
 Method 8081 may be used to determine the concentrations of various organochlorine pesticides in extracts from solid and liquid matrices, using fused-silica, open-tubular, capillary columns with electron capture detectors (ECD) or electrolytic conductivity detectors (ELCD).
Applicable
Conc Range:
 None given.
Interferences: (1) Contamination of samples, solvent, and carrier gases with target analytes (especially compounds common to environmental laboratories, like methylene chloride).
(2) Contamination of samples with sulfur (primarily present in base-neutral fractions).
(3) Septum bleed (compounds from the injection septum are analyzed with the sample).
(4) Column bleed (compounds from column coating break down, decreasing column efficiency).
(5) Ghost peaks (compounds adsorb strongly to the column and carry over to later runs).
(6) Coelution of species.
(7) Coextracted contaminants.
(8) Phthalate esters interfere with detection of pesticides via electron capture detector.
QC Requirements: (see ch.1, SW-846 Methods 3500, 8000), CV, calibration standard, initial demonstration of proficiency, MB, MS, MSD, LD, LCS, and the addition of surrogates to each field sample and QC sample, CS (after 20 samples)
Sample Handling: Store the extract in the refrigerator and analyze it within 40 days of extraction. See SW-846, Chapter 4, Organic Analytes, Section 4. See SW-846 Chapter Four for information.
Max 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.
 
Relative Cost: $201 to $400
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