title: Determination of diisobutyl- and diisopropylnaphthalenesulphonates in pesticide wettable powders and dispersible granules by high-performance liquid chromatography.
abstract: Methods are presented for determining diisobutyl and diisopropylnaphthalenesulphonates in pesticides formulated as wettable powders or water dispersible granules. The dispersing agents were concentrated on anion-exchange cartridges and after removal of interfering substances eluted with methanol containing 5% hydrochloric acid. The various isomers were separated by reversed-phase high-performance liquid chromatography on an octyl-modified column using a water-methanol gradient or on a cyanoalkyl-modified column with water-methanol. Quantitative results were obtained by comparing the peaks with those of the standard technical material. Various groups of peaks were identified as mono-, di- and triisobutylnaphthalenesulphonates respectively.
authors.affiliation: Plant Protection Service, Wageningen, The Netherlands.
authors.forename: R H
authors.initials: RH
authors.lastname: Schreuder
authors.forename: A
authors.initials: A
authors.lastname: Martijn
authors.forename: C
authors.initials: C
authors.lastname: Van de Kraats
mesh_terms: D002851:Chromatography, High Pressure Liquid; D009282:Naphthalenesulfonates / Q000032:analysis*; D010575:Pesticides / Q000032:analysis*; D013056:Spectrophotometry, Ultraviolet
chemical_list: D009282:Naphthalenesulfonates; D010575:Pesticides; C024797:Nekal; C012451:diisobutylnaphthalenesulfonate