EPA Method 528


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EPA Method 528:
Phenols in Water by GC/MS. Official Name: Determination of Phenols in Drinking Water by Solid Phase Extraction and Capillary Column Gas Chromatography/Mass Spectrometry (GC/MS)

Summary:
A 1-L sample is extracted using a solid phase extraction (SPE) cartridge. Phenols trapped by the SPE cartridge are eluted with methylene chloride. The concentrations of phenols in the extract are determined using a gas chromatography (GC) system equipped with a mass spectrometer (MS) detector.

Scope:
This method determines phenols in finished drinking water.

Citation:
Methods for the Determination of Organic and Inorganic Compounds in Drinking Water, Volume 1 (EPA/815-R-00-014)

Interferences:
(A) Contamination: Solid Phase Extraction (SPE) devices and reagents can introduce contaminants. Also, the suggested internal standard may contain phenolic contaminants; if suspected chose another standard.(B) Silicone: Methylene chloride may leach silicone compounds; these will usually not interfere.(C) Airborne phenol: Minimize contact of samples with atmospheric sources of phenol.

QC Requirements:
Initial demonstration of laboratory capability followed by regular analyses of continuing calibration checks, laboratory performance check standards, laboratory reagent blanks, laboratory fortified blanks, and laboratory fortified matrix samples. A method detection limit (MDL) must be determined for each analyte of interest.

Maximum Holding Time:
14 days; 30 days after extraction.

Media:
WATER

Subcategory:
Organic

Concentration:
0.1-15 ug/L for most analytes; 1-15 ug/L for others.

Precision:
Precision and accuracy values were determined using data from seven replicate analyses of fortified reagent water samples. Samples were analyzed using a hot splitless injection protocol. Additional precision and accuracy values are available in the method.

Detection:
MDLs represent performance on the primary column. Secondary columns used in validation of the method allowed for much lower MDLs for some analytes. Consult the method for more information.MDLs were determined using the standard deviation of 7 or 8 replicate analyses of a analyte-fortified reagent water (over a 3-day span) multiplied by the t-value for 6 or 7 degrees of freedom at the 99% confidence level. Detailed instructions for how MDLs are determined are found at 40 CFR part 136, Appendix B and Section 9.2.4 of the method.

Revision Number:
Revision 1.0, April 2000

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