NEMI Method Summary

Method Summary Information

Method Number: 550 Media: WATER
Revision: July 1990
Method Source: U.S. EPA National Exposure Research Laboratory (NERL) [formerly EMSL]
Analytes in this method
Subcategory: ORGANIC
Official Name: Determination of Polycyclic Aromatic Hydrocarbons in Drinking Water by Liquid-Liquid Extraction and HPLC with Coupled Ultraviolet and Fluorescence Detection
Descriptive Name PAHs in Water Using HPLC/UV/FL
Source Info: U.S.EPA National Exposure Research Laboratory (NERL)
Microbiological and Chemical Exposure Assessment Research Division (MCEARD)
[formerly the Environmental Monitoring Systems Laboratory (EMSL), Cincinnati, OH]
26 West Martin Luther King Drive
Cincinnati, Ohio 45268-0001
Fax: 513-569-7757
email: DWmethods.help@epa.gov
Citation: Methods for the Determination of Organic Compounds in Drinking Water - Supplement I (EPA/600/4-90-020)
105801 Byte file
Brief Method
Summary:
 A 1-L sample is serially extracted with methylene chloride using a separatory funnel. The methylene chloride extract is dried and concentrated to a volume of 1 mL. A 3-mL portion of acetonitrile is added to the extract and concentrated to 0.5-mL. The concentrations of PAHs in the extract are measured using a high performance liquid chromatography (HPLC) system equipped with ultraviolet absorption (UV) and fluorescence detectors.
Scope And
Application:
 This method determines certain polycyclic aromatic hydrocarbons (PAHs) in drinking water sources and finished drinking water.
Applicable
Conc Range:
 Ranges differ for each analyte depending on matrix and interferences.
Interferences:

(A) Glassware contamination: Thoroughly clean glassware, including baking or solvent rinse.

(B) Solvent contamination: Use high purity solvents.

(C) Extracted interferences: Interference from extracted non-target compounds, with retention times similar to target compounds, can be reduced by sample cleanup. However, matrix interferences have been observed for benzo(a)anthracene, benzo(a)pyrene, and benzo(g,h,i)perylene.
QC Requirements:

Initial demonstration of laboratory capability, analysis of laboratory reagent blanks (LRBs), laboratory fortified blanks (LFBs), laboratory fortified matrix samples, and QC samples. A MDL for each analyte must also be determined.
Sample Handling:

Grab samples must be collected in glass, amber bottles (or foil-wrapped bottles) and amber vials to protect PAH in samples and extracts from photolytic decomposition using conventional sampling practices; however, the bottle must not be prerinsed with sample before collection. Composite samples should be collected in refrigerated glass containers.

Dechlorinate with 100 mg of sodium thoisulfate per liter of sample and mix well if residual chlorine is present. Adjust the pH of the sample to less than 2 with 6N HCl. Store samples at 4oC away from light until analysis.
Max Holding Time:

7 days; extracts within 30 days.
 
Relative Cost: $201 to $400
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