EPA Method 612

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EPA Method 612:
Chlorinated Hydrocarbons

Summary:
A 1-L sample is extracted with methylene chloride using a separatory funnel. The methylene chloride extract is dried and exchanged to hexane during concentration to a volume of 10-mL or less. The concentrations of chlorinated hydrocarbons in the extract are measured using a gas chromatography (GC) system equipped with an electron capture detector (ECD).

Scope:
This method determines certain chlorinated hydrocarbons in wastewater and other waters.

Citation:
EPA Method Guidance CD-ROM (includes MCAWW Methods, and most current EPA Methods)

Interferences:
(A) Glassware contamination: Thoroughly clean glassware, including baking or solvent rinse.(B) Reagent contamination: Use high purity reagents.(C) Extracted interferences: Interference from extracted non-target compounds, with retention times similar to target compounds, can be reduced by performing a cleanup procedure.

QC Requirements:
Each laboratory that uses this method is required to operate a formal quality control program. The minimum requirements of this program consist of an initial demonstration of laboratory capability and an ongoing analysis of spiked samples to evaluate and document data quality. The laboratory must maintain records to document the quality of data that is generated. Ongoing data quality checks are compared with established performance criteria to determine if the results of analyses meet the performance characteristics of the method. When the results of sample spikes indicate atypical method performance, a quality control check standard must be analyzed to confirm that the measurements were performed in an in-control mode of operation.

Maximum Holding Time:
Extract w/in 7 days; Analyze extracts w/in 40 days.

Media:
WATER

Subcategory:
Organic

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

Precision:
The precision and accuracy values were determined using regression equations derived from a 20 laboratory validation study. The study determined analytes using reagent water, drinking water, surface water, and three industrial wastewaters with known additions at six concentrations over the range 1.0 to 356 ?g/L. Single operator precision, overall precision, and accuracy were found to be directly related to the concentration of the parameter and essentially independent of the sample matrix.

Detection:
MDLs were determined using the standard deviation of 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:
40 CFR Part 136, Appendix A (Current Edition)