EPA Method 505

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EPA Method 505:
Analysis of Organohalide Pesticides and Commercial Polychlorinated Biphenyl (PCB) Products in Water by Microextraction and Gas Chromatography - Revision 2.1.

A 35-mL sample is extracted with 2-mL of hexane. The concentrations of pesticides and PCBs in the extract are measured using a gas chromatography (GC) system equipped with a linearized electron capture detector (ECD).

This method determines organochlorine pesticides and polychlorinated biphenyls (PCBs) in finished drinking water, drinking water during intermediate stages of treatment, and the raw source water.

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

(A) Glassware contamination: Thoroughly clean glassware, including baking or solvent rinse.(B) Reagent contamination: Use high purity reagents.(C) Contamination from sample carryover: Rinsing apparatus with hexane and purging equipment between analyses can minimize contamination.(D) Extracted interferences: Interference from extracted non-target compounds, with retention times similar to target compounds, can be reduced by cleaning the extract or using confirmation analysis.(E) Variable solvents: Use the same solvent for each analysis.(F) Endrin degradation: The splitless injector may cause endrin degradation. Endrin can break down by reacting with the active sites on the port sleeve.(G) PCBs loss to glass surfaces: Rinse glass and minimize sample contact with glass to prevent adsorption loss of PCBs.(H) Oxidation of target compounds: Oxidation of compounds (specifically easily-oxidized aldrin, hexachlorocyclopentadiene, and methoxychlor) can be prevented by adding sodium thiosulfate at collection.(I) Phthalate interference: An unknown interference (possibly dibutyl phthalate) appears in heptachlors retention window.

QC Requirements:
Initial demonstration of laboratory capability, followed by analysis of laboratory reagent blanks (LRB), laboratory fortified blanks (LFB), laboratory fortified sample matrix (LFM), and quality control samples (QCS). A MDL for each analyte must also be determined.

Maximum Holding Time:
14 days before extraction, except for heptachlor (7 days). Extracts up to 24 hours.



Ranges differ for each analyte depending on matrix and instrumentation.

Precision and accuracy values were calculated using data from five to eight analyses of fortified reagent water. NOTE: "PCBs" is a regulatory parameter in drinking water regulations, and encompasses the sum of multiple Aroclors. See performance data for specific Aroclors.

MDLs were determined using the standard deviation of 5 to 8 replicate analyses of an analyte-fortified reagent water sample multiplied by the t-value for (# of samples - 1) 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 2.1, 1995