NEMI Method Summary

Method Summary Information

Method Number: D5812 Media: WATER
Revision: 1996
Method Source: ASTM International
Subcategory: ORGANIC Analytes in this method
Official Name: Standard Test Method for Determination of Organochlorine Pesticides in Water by Capillary Column Gas Chromatography
Descriptive Name Organochlorine Pesticides in Water by Capillary Column by GC/ECD
Source Info: ASTM International
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Citation: ASTM Volume 11.02
 
Brief Method
Summary:
 Pesticides in a water sample are extracted with methylene chloride (CH2Cl2) using a separatory funnel. The extract is dried, concentrated, exchanged to methyl tert-butyl ether (MTBE), and concentrated to 5 mL. Analysis is performed on a gas chromatograph equipped with an electron capture detector (ECD).
Scope And
Application:
 This test method covers the capillary gas chromatographic determination of various organochlorine pesticides, including some of their degradation products and related compounds in finished drinking water. This test method is not limited to this particular aqueous matrix; however, its applicability to other aqueous matrices must be determined.
Applicable
Conc Range:
 Varies by analyte (ug/L).
Interferences: Glassware must be cleaned scrupulously as soon as possible after use. The use of high-purity reagents and solvents helps minimize interference problems. Purification of solvents by distillation in all-glass systems may be required. Phthalate esters, found frequently in plastics, paints, and other common laboratory items, produce a positive response on an electron capture detector. Interfering contamination may occur when a sample containing low concentrations of analytes is analyzed immediately following a sample containing relatively high concentrations of analytes. Matrix interferences may be caused by contaminants that are coextracted from the sample. Also, note that all of the analytes listed in the Scope are not resolved from each other on any one column; that is, one analyte of interest may be an interferant for another analyte of interest. Caution must be taken in the determination of endrin since it has been reported that the splitless injector may cause endrin degradation Variable amounts of pesticides and PCBs from aqueous solutions may adhere to glass surfaces. It is recommended that sample transfers and glass surface contacts be minimized to the extent possible. Aldrin and methoxychlor are oxidized by chlorine rapidly.
QC Requirements: Minimum of IDLC, IPC, LRBs, LFM; if available - QCSs
Sample Handling: Collect the sample in accordance with either Specification D 1192 or Practices D 3370, whichever is applicable. Glass bottles (1-L recommended) equipped with TFE-fluorocarbon or aluminum foil-lined screw caps, prepared in accordance with Practices D 3694, are used for sample collection. Fill a sufficient number of sample bottles with sample to permit the running of duplicates, spikes, and reanalyses.
Max Holding Time:
 Extract within 7 days of sample collection. Analyze within 14 days of sample extraction.
 
Relative Cost: $201 to $400
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