EPA-EAD: 1613: Dioxins and Furans by HRGC/HRMS
Official Method Name
|
Tetra- through Octa-Chlorinated Dioxins and Furans by Isotope Dilution HRGC/HRMS |
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Current Revision
| October 1994, includes 1613B |
Media
|
VARIOUS |
Instrumentation
|
Gas Chromatography with Mass Spectrometry Detection |
Method Subcategory
|
Organic |
Method Source
|
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Citation
|
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Brief Method Summary
|
Samples are extracted, cleaned, and concentrated. Extracts are analyzed using high resolution gas chromatography/high resolution mass spectrometry (HRGC/HRMS). An individual CDD/CDF is identified by comparing the GC retention time and ion abundance ratio of two exact m/z's with the corresponding retention time of an authentic standard and the theoretical or acquired ion-abundance ratio of the two exact m/z's. Quantitative analysis is performed using selected ion current profile (SICP) areas. |
Scope and Application
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This method determines tetra- through octa-chlorinated dibenzo-p-dioxins (CDDs) and dibenzofurans (CDFs) in water, soil, sediment, sludge, tissue, and other sample matrices. |
Applicable Concentration Range
|
Not Available. |
Interferences
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(A) Glassware contamination: Thoroughly clean glassware as soon as possible after use with solvent, sonication, and multiple rinses. Do not bake reusable glassware as part of routine cleaning. (B) Reagent contamination: Use high purity reagents. (C) Matrix interferences: Demonstrate matrix is free from interferences by running reference matrix method blanks. The natural lipid content of tissue can interfere in the analysis of tissue samples. Remove by lipid removal process. (D) Extracted interferences: Interference from extracted non-target compounds, with retention times similar to target compounds, can be reduced by cleaning the extract. |
Quality Control Requirements
|
The minimum requirements consist of an initial demonstration of laboratory capability, analysis of samples spiked with labeled compounds to evaluate and document data quality, and analysis of standards and blanks as tests of continued performance. |
Sample Handling
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Collect samples in amber glass containers. Maintain aqueous samples in the dark at 0-4oC. If residual chlorine is present, add 80 mg sodium thiosulfate per liter of water. If sample pH is greater than 9, adjust to pH 7-9 with sulfuric acid. Maintain solid, semi-solid, oily, and mixed phase samples in the dark at <4oC; after receipt at the laboratory, store in the dark at <-10oC. |
Maximum Holding Time
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1 year (prior to extraction). |
Relative Cost
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$201 to $400 |
Sample Preparation Methods
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None. |