Determination of Carbamate, Urea, and Thiourea Pesticides and Herbicides in Water
- 25 January 2001
- journal article
- research article
- Published by American Chemical Society (ACS) in Analytical Chemistry
- Vol. 73 (5), 997-1006
- https://doi.org/10.1021/ac0010734
Abstract
Microbore liquid chromatography and positive ion electrospray mass spectrometry are applied to the determination of 16 carbamate, urea, and thiourea pesticides and herbicides in water. The electrospray mass spectra of the analytes were measured and are discussed and mobile-phase matrix effects were evaluated. Analyte positive ion abundances are generally inversely related to the concentration of acetic acid in the acetonitrile−water mobile phase in the range of 0.001−0.1% (v/v) acetic acid. Using an internal standard for quantitative analyses and no acid in the mobile phase, retention time precision, peak width precision, concentration measurement precision, mean recoveries, and instrument detection limits were determined in reagent water. The 16 analytes were also measured in fortified environmental water samples from a recreational lake, a groundwater well, a cistern, a farm pond, and drinking water. These measurements were at 5 ng/mL of each analyte, which is within the range expected for environmental pesticide and herbicide contaminants. The analytes were separated from the environmental water matrixes with an on-line extraction and concentration to provide rapid sample analyses without a slow off-line liquid−liquid or liquid−solid−liquid extraction and extract concentration. Recoveries of 12 of the analytes from 4 environmental water samples were in the range of 75−124% with relative standard deviations in the range of 11−16%.Keywords
This publication has 12 references indexed in Scilit:
- A brief overview of the present status of the mechanisms involved in electrospray mass spectrometryJournal of Mass Spectrometry, 2000
- Relation of Usage to the Occurrence of Cotton and Rice Herbicides in Three Streams of the Mississippi DeltaEnvironmental Science & Technology, 1998
- Airborne Pesticide Residues along the Mississippi RiverEnvironmental Science & Technology, 1998
- Occurrence of Pesticides in Shallow Groundwater of the United States: Initial Results from the National Water-Quality Assessment ProgramEnvironmental Science & Technology, 1998
- Environmental GIS: The World in a ComputerEnvironmental Science & Technology, 1996
- Mass spectrometric analysis of nitrogen- and phosphorus-containing pesticides by liquid chromatography-Mass SpectrometryJournal of the American Society for Mass Spectrometry, 1994
- Nonpoint source contamination of the Mississippi River and its tributaries by herbicidesEnvironmental Science & Technology, 1993
- An evaluation of atmospheric pressure ionization techniques for the analysis of N-Methyl carbamate pesticides by liquid chromatography mass spectrometryJournal of the American Society for Mass Spectrometry, 1992
- Some Developments in Nuclear Magnetic Resonance of SolidsScience, 1989
- Capillary supercritical fluid chromatographyAnalytical Chemistry, 1981