EPA Method 548

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EPA Method 548:
Determination of Endothall in Drinking Water by Aqueous Derivatization, Liquid-Solid Extraction, and Gas Chromatography with Electron-Capture Detection

A 5.0 mL volume of liquid sample is placed in a Kuderna-Danish tube and the volume is reduced to less than 0.75 mL using a heating block. The tube is charged with glacial acetic acid and sodium acetate, followed by a solution of the derivatization reagent, pentafluorophenylhydrazine (PFPH), in glacial acetic acid. After heating at 150?C for 90 minutes the derivative is extracted by a solid sorbent from the reaction solution, followed by elution with 5.0 mL of methyl-tert-butyl ether (MTBE). The MTBE extract is analyzed by gas chromatography with electron capture detection (GC/ECD).

This method covers the determination of endothall in drinking water sources and finished drinking water.

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