Methods of analysis by the U. S. Geological Survey National Water Quality Laboratory-Determination of organonitrogen herbicides in water by solid-phase extraction and capillary-column gas chromatography/mass spectrometry with selected-ion monitoring
Open-File Report
91-519
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Abstract
A method for the isolation of organonitrogen herbicides from natural
water samples using solid-phase extraction and analysis by capillary-column
gas chromatography/mass spectrometry with selected-ion monitoring is
described. Water samples are filtered to remove suspended particulate matter
and then are pumped through disposable solid-phase extraction cartridges
containing octadecyl-bonded porous silica to remove the herbicides. The
cartridges are dried using carbon dioxide, and adsorbed herbicides are
removed from the cartridges by elution with 1.8 milliliters of hexaneisopropanol
(3:1). Extracts of the eluants are analyzed by capillary-column gas
chromatography/mass spectrometry with selected-ion monitoring of at least
three characteristic ions. The method detection limits are dependent on
sample matrix and each particular herbicide. The method detection limits,
based on a 100-milliliter sample size, range from 0.02 to 0.25 microgram per
liter. Recoveries averaged 80 to 115 percent for the 23 herbicides and 2
metabolites in 1 reagent-water and 2 natural-water samples fortified at levels
of 0.2 and 2.0 micrograms per liter.
Suggested Citation
Sandstrom, M.W., Wydoski, D.S., Schroeder, M.P., Zamboni, J.L., Foreman, W., 1992, Methods of analysis by the U. S. Geological Survey National Water Quality Laboratory-Determination of organonitrogen herbicides in water by solid-phase extraction and capillary-column gas chromatography/mass spectrometry with selected-ion monitoring: U.S. Geological Survey Open-File Report 91-519, 26 p., https://doi.org/10.3133/ofr91519.
ISSN: 2331-1258 (online)
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Methods of analysis by the U. S. Geological Survey National Water Quality Laboratory-Determination of organonitrogen herbicides in water by solid-phase extraction and capillary-column gas chromatography/mass spectrometry with selected-ion monitoring |
| Series title | Open-File Report |
| Series number | 91-519 |
| DOI | 10.3133/ofr91519 |
| Year Published | 1992 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Contributing office(s) | National Water Quality Laboratory |
| Description | 26 p. |