title: Liquid chromatographic-diode-array detection multiresidue determination of rice herbicides in drinking and paddy-field water.
abstract: A sensitive, rapid, and simple multiresidue method for the simultaneous determination of six postemergence herbicides currently used in rice cultivation--metsulfuron methyl, bensulfuron methyl, pyrazosulfuron ethyl, bentazone, bispyribac sodium, and cyhalofop butyl--in drinking and paddy-field water is presented. Water samples were extracted with solid-phase extraction cartridges. Final determination was made by LC with diode-array detection. The extraction efficiencies of C18 and HLB cartridges were compared. The average recovery obtained for these compounds for the lowest spiked level (0.1 microg/L) varied from 70 to 122% for C18 and 75-119% for HLB, with RSDs of 11 and 8.3%, respectively. The method had good linearity, and the lower detection limit for the pesticides studied varied from 0.03 to 0.04 microg/L. The proposed method was also tested in paddy-field water, with recovery studies giving good results with low RSDs at 1.0 microg/L.
authors.affiliation: Universidade Federal de Santa Maria, Laboratório de Análise de Resíduos de Pesticides, Avda. Roriama 1000, Campus Carnobi, 97105-900, Santa María, Rio Grande do Sul, Brazil.
authors.forename: Rafael
authors.initials: R
authors.lastname: Roehrs
authors.forename: Renato
authors.initials: R
authors.lastname: Zanella
authors.forename: Ionara
authors.initials: I
authors.lastname: Pizzuti
authors.forename: Martha B
authors.initials: MB
authors.lastname: Adaime
authors.forename: Lucía
authors.initials: L
authors.lastname: Pareja
authors.forename: Silvina
authors.initials: S
authors.lastname: Niell
authors.forename: María V
authors.initials: MV
authors.lastname: Cesio
authors.forename: Horacio
authors.initials: H
authors.lastname: Heinzen
mesh_terms: D002851:Chromatography, High Pressure Liquid; D006540:Herbicides / Q000032:analysis*; D007202:Indicators and Reagents; D012275:Oryza / Q000737:chemistry*; D010573:Pesticide Residues / Q000032:analysis*; D012015:Reference Standards; D015203:Reproducibility of Results; D012996:Solutions; D014867:Water / Q000032:analysis*; D014881:Water Supply / Q000032:analysis*
chemical_list: D006540:Herbicides; D007202:Indicators and Reagents; D010573:Pesticide Residues; D012996:Solutions; D014867:Water