title: Determination of glyphosate in water samples by IC.
abstract: Agricultural development and its associated impacts on the environment are resulting in increasingly restrictive guidelines and legislation concerning the use of chemicals in agro-ecosystems. The herbicide glyphosate is widely used for weed control in both cultivated and uncultivated areas and is considered to show low toxicity to mammals. It is highly water-soluble, and its monitoring in surface, underground, and potable waters is recommended by the United States Environmental Protection Agency. This work presents a method for the inclusion of glyphosate determination within routine anion analysis using ion chromatography in water sampler without any kind of extraction, clean-up, or preconcentration step. The equipment used was a Dionex Model ICS-3000 ion chromatograph fitted with a 25-microL loop, Ion Pac AG19 guard and AS19 analytical columns, ASRS-300 (2 mm) suppressor, and conductivity detector. The method showed a linear response to glyphosate between 0.05-0.75 mg/L with a correlation coefficient of 0.999, and a detection limit below the maximum levels permitted by Brazilian legislation. Recoveries in the range 90-105% were achieved in tests using surface, well, potable, and ultrapure water samples.
authors.affiliation: Instituto Tecnológico e de Pesquisas do Estado de Sergipe. Rua Campo do Brito no 371, Bairro São José-CEP 49020-380, Aracaju-SE, Brasil. maria.marques@itps.se.gov.br
authors.forename: M N
authors.initials: MN
authors.lastname: Marques
authors.forename: E A
authors.initials: EA
authors.lastname: Passos
authors.forename: M T S
authors.initials: MT
authors.lastname: da Silva
authors.forename: F O
authors.initials: FO
authors.lastname: Correia
authors.forename: A M O
authors.initials: AM
authors.lastname: Santos
authors.forename: S S
authors.initials: SS
authors.lastname: Gomes
authors.forename: J P H
authors.initials: JP
authors.lastname: Alves