NEMI Method Summary

Method Summary Information

Method Number: O-1104 Media: WATER
Revision: 1983
Method Source: U.S. Geological Survey (USGS)
Subcategory: ORGANIC Analytes in this method
Official Name: Organochlorine and organophosphorous compounds,dissolved, gas chromatographic
Descriptive Name Organochlorine and organophosphorous compounds, dissolved
Source Info: USGS Branch of Information Services
Box 25286, MS 417
Federal Center
Denver, CO 80225-0286
Phone: 303-202-4700
Citation: USGS Methods, Volume A3
149020 Byte file
Brief Method
Summary:
 Approximately one liter of water is filtered through a 0.7 micron glass fiber filter. Organochlorine and organophosphorous compounds are extracted from the filtered water with hexane. Organophosphorous compounds are determined on a gas chromatograph with flame photometric detectors. The extracts are then purified using adsorption chromatography on an alumina column. If PCB's, PCN's, and toxaphene are present, the extracts are further purified using a silica gel column. The organochlorine compounds are then determined by gas chromatography using electron capture detectors.
Scope And
Application:
 This method is suitable for the determination of organochlorine insecticides, polychlorinated biphenyls (PCB's), polychlorinated naphthalenes (PCN's), and organophosphorous insecticides in filtered water containing at least 0.01ug/L of the analyte.
Applicable
Conc Range:
 0.01ug/l-0.6ug/l (undiluted)
Interferences: Compounds having chemical and physical properties similar to the compound of interest may cause interference. Sulfur and organosulfur compounds will interfere, but these substances can be removed by treating the final extracts with mercury; however, the mercury treatment will also remove organophosphorous compounds.
QC Requirements: Reagent water blank for each batch of samples. Calibrate daily with two point calibration.
Sample Handling: Description: 1 L Glass bottle, amber
Treatment and Preservation: Bottle baked at 450 deg C by laboratory. DO NOT RINSE BOTTLE. Do not fill bottle beyond shoulder, as reagents must be added to the sample at the laboratory before analyses. Chill sample and maintain at 4 deg C; ship immediately.
Max Holding Time:
 Seven days from collection to extraction.
 
Relative Cost: $201 to $400
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