EPA Method 508.1

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EPA Method 508.1:
Determination of Chlorinated Pesticides, Herbicides, and Organohalides by Liquid-Solid Extraction and Electron Capture Gas Chromatography -Revision 2.0.

Summary:
A 1-L sample is passed through a liquid/solid extraction (LSE) disk or cartridge containing a solid inorganic matrix coated with a chemically bonded C-18 organic phase. The analytes (pesticides, herbicides, and organohalides) are eluted from the LSE disk or cartridge with small volumes of ethyl acetate and methylene chloride, and this eluate is concentrated by evaporation of some of the solvent. The concentrations of analytes are determined using a fused silica capillary column gas chromatography (GC) system equipped with an electron capture detector (ECD).NOTE: CAS Numbers in NEMI for cis- and trans- permethrin differ from those in the method. The CAS Numbers in NEMI are the correct ones.

Scope:
This method determines 29 chlorinated pesticides, three herbicides, and four organohalides in drinking water, ground water, and drinking water in any treatment stage.

Citation:
Methods for the Determination of Organic Compounds in Drinking Water - Supplement III (EPA/600/R-95-131)

Interferences:
(A) Reagent contamination: Use high purity reagents.(B) Contamination from sample carryover: Rinsing apparatus replacing syringes and injection port liners as needed can minimize contamination.(C) Variable solvents: Use the same solvent for each analysis.

QC Requirements:
Initial demonstration of laboratory capability, followed by laboratory reagent blanks (LRBs), laboratory fortified blanks (LFBs), and laboratory fortified matrix samples. Additional quality control practices are recommended. Initial demonstration of capability is demonstrated by analysis of a minimum of four replicate LFBs containing each analyte of concern at a suggested concentration in the range of 0.01 - 0.5 ug/L. The mean accuracy should be 70% to 130% and the RSD should be less than 30%. A method detection limit (MDL) must also be determined for each analyte.

Maximum Holding Time:
14 days.

Media:
WATER

Subcategory:
Organic

Concentration:
Ranges differ for each analyte depending on matrix and instrumentation.

Precision:
Precision and accuracy values determined using single laboratory data from seven replicate measurements of reagent water sample fortified with the analytes of interest. NOTE: "PCBs" is a regulatory parameter in drinking water regulations, and encompasses the sum of multiple Aroclors. See performance data for specific Aroclors. NOTE: CAS Numbers in NEMI for cis- and trans- permethrin differ from those in the method. The CAS Numbers in NEMI are the correct ones.

Detection:
MDLs were determined using the standard deviation of 7 replicate analyses of an analyte-fortified reagent water sample multiplied by the t-value for 6 degrees of freedom at the 99% confidence level. Detailed instructions for how MDLs are determined are found at 40 CFR part 136, Appendix B.

Revision Number:
Revision 2.0, 1995

Test Description:
Chlorinated Pesticid

Report Number:
600/R-95-131

Instrument used for this test:
GC