title: Determination of herbicides in soil samples by gas chromatography: optimization by the simplex method.
abstract: An analytic method for the determination of phenoxy acid herbicides and 2,4-D esters in soil samples by GC-FID is described. The esterification reaction with MeOH and H(2)SO(4) as catalyst has been used, optimizing experimental variables by the 'Simplex method'. The recoveries in soil samples were between 76 and 97% with relative S.D.s between 4 and 7% (n=4) at level of concentration of 5 and 10 mug ml(-1) for phenoxy acids and 2,4-D esters, respectively.
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, Complutense University of Madrid, 28040 Madrid, Spain.
authors.forename: M J
authors.initials: MJ
authors.lastname: Santos-Delgado
authors.forename: E
authors.initials: E
authors.lastname: Crespo-Corral
authors.forename: L M
authors.initials: LM
authors.lastname: Polo-Díez