EPA's Study of Hydraulic Fracturing and Its Potential Impact on Drinking Water Resources

QAPP for Multi-Laboratory Verification of Diethylene Glycol, Triethylene Glycol, Tetraethylene Glycol, 2-Butoxyethanol and 2-Methoxyethanol in Ground and Surface Waters by Liquid Chromatography/Tandem Mass Spectrometry

This QAPP describes the technical details and associated quality assurance and quality control procedures for the analytical method development research project.

You will need Adobe Reader to view some of the files on this page. See EPA’s About PDF page to learn more.

QAPP for Multi-Laboratory Verification of Diethylene Glycol, Triethylene Glycol, Tetraethylene Glycol, 2-Butoxyethanol and 2-Methoxyethanol in Ground and Surface Waters by Liquid Chromatography/Tandem Mass Spectrometry, Revised February 14, 2013 (PDF)(61 pp, 1 MB)