EPA-OGWDW/TSC: 504.1: EDB,DCBP, and 123TCP in Water Using GCECD

Summary
Analytes
Revision
Data and Sites

Official Method Name

1,2-Dibromoethane (EDB), 1,2-Dibromo-3-Chloro-Propane (DCBP), and 1,2,3-Trichloropropane (123TCP) in Water by Microextraction and Gas Chromatography

Current Revision

Revision 1.1, 1995

Media

WATER

Instrumentation

Gas Chromatography with Electron Capture Detection

Method Subcategory

Organic

Method Source

EPA-OGWDW/TSC

Citation

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

Brief Method Summary

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

Scope and Application

This method determines EDB, DCBP, and 123TCP (analytes) in finished drinking water and groundwater.

Applicable Concentration Range

0.03 - 200 ug/L

Interferences

(A) Solvent contamination: Use high purity solvents, and test solvents to prevent contamination.
(B) Extracted interferences: Interference can occur from extracted non-target compounds, with retention times similar to target compounds.
(C) DBCM Contamination: DBCM is a common disinfection byproduct which elutes near the EDB retention time window, and can obscure the EDB signal.

Quality Control Requirements

Initial demonstration of laboratory capability, followed by field reagent blanks (FRB), 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.

Sample Handling

Samples are collected in 40 mL bottles and are dechlorinated using sodium thiosulfate. When sampling, the tap is allowed to run for 10 minutes, and collection is done at a flow rate of about 500 mL/min. Samples must be chilled at 4^oC upon collection and until analysis, and stored in an area that is free of organic solvent vapors.

Maximum Holding Time

14 days; extracts up to 24 hours.

Relative Cost

$201 to $400

Sample Preparation Methods

This method has 4 analytes associated with it.

Analyte	Detection Level	Bias	Precision	Spiking Level
1,2,3-Trichloropropane(96-18-4) 1,2,3-Trichloropropane Allyl trichloride Glycerol trichlorohydrin Propane, 1,2,3-trichloro-	0.020 ug/L	111% Rec (SL)	3.70 % RSD (SL)	0.10 ug/L
1,2-Dibromoethane(106-93-4) 1,2-Dibromoethane Bromofume Dowfume EDB Ethane, 1,2-dibromo- Ethylene bromide Ethylene dibromide Glycol dibromide	0.010 ug/L	117% Rec (SL)	8.41 % RSD (SL)	0.10 ug/L
DBCP(96-12-8) 1,2-Dibromo-3-chloropropane Chloro-1,2-dibromopropane,3- DBCP Dibromochloropropane Fumagon, Fumazone Nemabrom, Nemafume, Nemagon, Nematocide Nemagon Nematocide Propane, 1,2-dibromo-3-chloro-	0.010 ug/L	111% Rec (SL)	1.28 % RSD (SL)	0.10 ug/L
Volatile organic compounds(E-12419) Organic compounds, volatile VOCs Volatile organic compounds	N/A	N/A	N/A

Precision Descriptor Notes:	Precision and accuracy values were calculated from seven replicate analyses of fortified reagent water in a single laboratory. Additional data are available in the method.
Detection Level Note:	MDLs were determined using the standard deviation of 8 replicate analyses of an analyte-fortified reagent water sample multiplied by the t-value for 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.

Revision	PDF/Link
Revision 1.1, 1995

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EPA-OGWDW/TSC: 504.1: EDB,DCBP, and 123TCP in Water Using GCECD

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