NEMI Method Summary

Method Summary Information

Method Number: 6420B Media: WATER
Revision: Standard Methods Online
Method Source: Standard Methods
Subcategory: ORGANIC Analytes in this method
Official Name: Liquid-Liquid Extraction Gas Chromatographic Method
Descriptive Name Phenols in Water by Liquid-Liquid Extraction GC
Source Info: Standard Methods Online is jointly produced by the American Public Health Association (APHA), the American Water Works Association (AWWA), and the Water Environment Federation (WEF).
These organizations may be contacted by phone for more information on Standard Methods Online:
APHA: (301) 893-1894
AWWA: (800) 926-7337, (1-303-794-7711, outside U.S. / Canada)
WEF: (800) 666-0206 (1-703-684-2452 outside U.S. / Canada)
Citation: Standard Methods Online
 
Brief Method
Summary:
 A measured volume of sample is acidified and extracted with methylene chloride. The extract is dried and exchanged to 2-propanol during concentration. The extract is separated by GC and phenols are measured with a FID.
Scope And
Application:
 Phenols
Applicable
Conc Range:
 None given
Interferences: Method interferences may be caused by contaminants in solvents, reagents, glassware, and other sample-processing hardware that lead to discrete artifiacts and/or elevated base lines in detector output.
QC Requirements: Include method blanks, an initial demonstration of laboratory capability and detection limits, assessment of the internal standard recovery, determination of surrogate compound recoveries, evaluation of calibration data and curves, sample matrix additions, and precision of replicate sample analysis.
Sample Handling: Collect grab samples in 1-L amber glass bottles fitted with a screw cap lined with TFE. Foil may be substituted for TFE if the sample is not corrosive. If amber bottles are not available, protect samples from light. Wash and rinse bottle and cap liner with acetone or methylene chloride, and dry before use. Follow conventional sampling practices but do not rinse bottle with sample. Collect composite samples in refrigerated glass containers.
Fill sample bottles and, if residual chlorine is present, add 80 mg sodium thiosulfate per liter of sample and mix well. Ice all samples or refrigerate at 4oC from time of collection until extraction.
Max Holding Time:
 Extract samples within 7 d of collection and analyze completely within 40 d of extraction.
 
Relative Cost: $201 to $400
URL to obtain ordering information for this method:
http://www.standardmethods.org/
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