Analysis of N-Nitrosodimethylamine and N-Nitrodimethylamine in GroundwaterA method for the analytical determination of N-nitrosodimethylamine (NDMA) and N-nitrodimethylamine (DMN) at parts-per-trillion (ppt) concentrations in groundwater is reported. The method uses a solid phase extraction (SPE) cartridge containing 2 g of activated coconut charcoal to extract a 500-mL water sample. NDMA and DMN are eluted from the SPE cartridge using acetone. The acetone is concentrated and brought to a final volume of 1.0 mL, which results in a theoretical 500-fold concentration of the analytes. The extracts are analyzed by gas chromatography (GC) with a nitrogenphosphorous detector (NPD), which is a highly sensitive and relatively inexpensive technique. The measured extraction efficiencies averaged 61 percent for NDMA and 74 percent for DMN. Extraction efficiencies were independent of NDMA and DMN concentrations from 40 to 2000 ppt. Several samples could be extracted then analyzed in a single day with the use of an extraction manifold and GC autosampler. A reporting limit of 10 ppt for NDMA and DMN was achieved. The MDLs for NDMA and DMN were 6.4 and 5.8 ppt, respectively. A typical turn-around time from beginning of extraction to reporting was 4 h. The method avoids the use of halogenated solvents, such as dichloromethane, and subsequent solvent exchange procedures necessary for use of the NPD detector.
Document ID
20080026008
Acquisition Source
Johnson Space Center
Document Type
Conference Paper
Authors
Greene, Ben (Honeywell Technology Solutions, Inc. Las Cruces, NM, United States)
Mast, Dion (Honeywell Technology Solutions, Inc. Las Cruces, NM, United States)
Baker, David L. (NASA White Sands Test Facility NM, United States)
Date Acquired
August 24, 2013
Publication Date
March 6, 2006
Subject Category
Chemistry And Materials (General)
Meeting Information
Meeting: JANNAF 33rd PEDCS
Location: Sandestin, FL
Country: United States
Start Date: March 6, 2006
End Date: March 10, 2006
Sponsors: NASA Headquarters, Department of the Air Force, Department of the Army, Department of the Navy