EPA Method 3535A

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EPA Method 3535A:
Solid-phase extraction for organic analytes. . Official Name: EPA Method 3535A, Solid-Phase Extraction

Summary:
Following any necessary pH adjustment, a measured volume is extracted by passing it through the solid-phase extraction medium, which is held in an extraction device designed for vacuum filtration of the sample. Target analytes are eluted from the solid phase media using an appropriate solvent which is collected in a receiving vessel. The resulting solvent extract is dried using sodium sulfate and concentrated, as needed. As necessary for the specific analysis, the concentrated extract may be exchanged into a solvent compatible extract with subsequent cleanup procedures or determinative procedures for the measurement of the target analytes.

Scope:
This method describes a procedure for isolating target organic analytes from aqueous samples using solid-phase extraction (SPE) media. The method describes conditions for extracting a variety of organic compounds from aqueous matrices that include: groundwater, wastewater and TCLP leachates. The method describes the use of disk extraction media for eight groups of analytes and the use of cartridge extraction media for one group of analytes. Other solid phase extraction media may be employed as described in Sec. 4.0. The extraction procedures are specific to the analytes of interest and vary by group of analytes and type of extraction media. The technique may also be applicable to other semivolatile or extractable compounds. It may also be used for the extraction of additional target analytes or may employ other solid-phase media, provided that the analyst demonstrates adequate performance using spiked sample matrices and an appropriate determinative method.

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

Interferences:
Phthalate esters, soap residue.

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

Maximum Holding Time:
See introductory material, Oraganic Analytes, Sec. 4.1, Method 3500, Sec. 7.1 of this method, and the specific determinative methods.

Media:
WATER

Subcategory:
Organic

Concentration:
None specified.

Sample Prep:
concentration, pH adjustment.

Precision:
Refer to determinative methods listed in Sec. 1.1 for performance data related to solid-phase extraction.

Detection:
No detection limit provided.

Revision Number:
Revision 6, November 2004.