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= 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 =
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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.
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      "name": "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",
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          "value": "10.3133/ofr91519",
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      "datePublished": "1992",
      "dateModified": "2021-05-28",
      "abstract": "A method for the isolation of organonitrogen herbicides from natural\r\nwater samples using solid-phase extraction and analysis by capillary-column\r\ngas chromatography/mass spectrometry with selected-ion monitoring is\r\ndescribed. Water samples are filtered to remove suspended particulate matter\r\nand then are pumped through disposable solid-phase extraction cartridges\r\ncontaining octadecyl-bonded porous silica to remove the herbicides. The\r\ncartridges are dried using carbon dioxide, and adsorbed herbicides are\r\nremoved from the cartridges by elution with 1.8 milliliters of hexaneisopropanol\r\n(3:1). Extracts of the eluants are analyzed by capillary-column gas\r\nchromatography/mass spectrometry with selected-ion monitoring of at least\r\nthree characteristic ions. The method detection limits are dependent on\r\nsample matrix and each particular herbicide. The method detection limits,\r\nbased on a 100-milliliter sample size, range from 0.02 to 0.25 microgram per\r\nliter. Recoveries averaged 80 to 115 percent for the 23 herbicides and 2\r\nmetabolites in 1 reagent-water and 2 natural-water samples fortified at levels\r\nof 0.2 and 2.0 micrograms per liter.",
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Latest revision as of 08:19, 15 August 2024

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