EPA Method 606


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EPA Method 606:
Phthalate Ester

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 esters in the extract are measured using a gas chromatography (GC) system equipped with an electron capture detector (ECD).

Scope:
This method determines certain phthalate esters 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) Phthalate ester interference: Avoid the use of plastics and use pure reagents to avoid contamination by these ubiquitous compounds.(D) 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 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 16 laboratory validation study. The study determined analytes at six concentrations in the range of 0.7 to 106 ug/L in multiple matrix types (including wastewaters, drinking waters, surface waters, and reagent water).

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)

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TO-15

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Mercury
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