EPA Method 3520C

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EPA Method 3520C:
Continuous Liquid-Liquid Extraction of Organics. Official Name: EPA Method 3520C, Continuous Liquid-Liquid Extraction

Summary:
A measured volume of sample, usually 1L, is placed into a continuous liquid-liquid extractor, adjusted, if necessary, to a specific pH, and extracted with organic solvent for 18-24h. The extract is dried, concentrated (if necessary), and, as necessary, exchanged into a solvent compatible with a cleanup or determinative method being employed.

Scope:
This method describes a procedure for isolating organic compounds from aqueous samples. The method also describes concentration techniques suitable for preparing the extract for the appropriate determinative steps. This method is applicable to the isolation and concentration of water-insoluble and slightly soluble organics in preparation for a variety of chromatographic procedures.

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

Interferences:
The decomposition of some analytes has been demonstrated under basic extraction conditions required to separate analytes. Organochlorine pesticides may dechlorinate, phthalate esters may exchange, and phenols may react to form tannates. These reactions increase with increasing pH, and are decreased by the shorter reaction times available in Method 3510.

QC Requirements:
Any reagent blanks, matrix spikes, or replicate samples should be subjected to exactly the same analytical procedures as those used on actual samples. Refer to Chapter One for specific quality control procedures and Method 3500 for extraction and sample preparation procedures.

Maximum Holding Time:
See introductory material, Organic analytes, Sec. 4.1.

Media:
WATER

Subcategory:
Sampling/Preparation

Concentration:
None specified.

Sample Prep:
See intro. material, Sec 4.1, SW-846.

Precision:
Refer to determinative methods for performance data.

Detection:
No detection limit specified.

Revision Number:
Revision 3, December 1996

Test Description:
Continuous Liquid-Li

Report Number:
SW-846 Ch 4.2.1