title: Stability and recovery of triazine and chloroacetamide herbicides from pH adjusted water samples by using empore solid-phase extraction disks and gas chromatography with ion trap mass spectrometry.
abstract: Empore disks were used to successfully extract herbicide residues from a difficult-to-analyze surface water source and deionized water. Herbicide recoveries were lower in surface water at 7,14, or 21 days after fortification and storage at 4 degrees C, presumably due to chemical sorption onto precipitated organic particulates. The addition of acid to the samples, as recommended in EPA Method 525.2, did not affect recoveries of alachlor and metolachlor, but reduced recoveries of atrazine, simazine, and cyanazine. Treatment of water samples with sodium hypochlorite did not affect alachlor or metolachlor recoveries, but greatly reduced the recovery of all triazine herbicides. This indicates that addition of acid or sodium hypochlorite to water samples may be detrimental to triazine analysis.
authors.affiliation: University of Tennessee, Department of Plant and Soil Sciences, Knoxville 37901-1071, USA.
authors.forename: T C
authors.initials: TC
authors.lastname: Mueller
authors.forename: S A
authors.initials: SA
authors.lastname: Senseman
authors.forename: K H
authors.initials: KH
authors.lastname: Carson
authors.forename: A S
authors.initials: AS
authors.lastname: Sciumbato
mesh_terms: D000081:Acetamides / Q000032:analysis* / Q000737:chemistry; D008401:Gas Chromatography-Mass Spectrometry; D006540:Herbicides / Q000032:analysis* / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D014227:Triazines; D014867:Water / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D000081:Acetamides; D006540:Herbicides; D014227:Triazines; D014874:Water Pollutants, Chemical; D014867:Water; C078188:2-chloro-N-(ethoxymethyl)-N-(2-methyl-6-(trifluoromethyl)phenyl)acetamide