title: Determination of hexazinone in groundwater by direct-injection high-performance liquid chromatography.
abstract: Hexazinone has been detected at levels ranging from 0.2 to 50 micrograms/L in many groundwater samples from eastern Maine over the past decade. A rapid and inexpensive direct-injection high-performance liquid chromatographic (HPLC) method has been developed to monitor contamination levels of the herbicide. The method is sensitive (limit of quantitation = 0.33 microgram/L) and is linear to 33.0 micrograms/L (R2 = 0.9995). Direct injection results from 50 field samples compared well (R2 = 0.98) with an HPLC method using solid-phase extraction for concentration and cleanup. The technique is very reproducible (coefficients of variation of 0-8.4% within day and 3.0-13.2% between day) and eliminates loss of analyte because of fewer steps in the procedure.
authors.affiliation: University of Maine, Department of Food Science and Human Nutrition, Orono 04469, USA.
authors.forename: L B
authors.initials: LB
authors.lastname: Perkins
authors.forename: R J
authors.initials: RJ
authors.lastname: Bushway
authors.forename: L E
authors.initials: LE
authors.lastname: Katz
mesh_terms: D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D006540:Herbicides / Q000032:analysis*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014227:Triazines / Q000032:analysis*; D014867:Water / Q000737:chemistry*
chemical_list: D006540:Herbicides; D014227:Triazines; D014867:Water; C025641:hexazinone