Multiresidue determination of herbicides in environmental waters from Primavera do Leste Region (Middle West of Brazil) by SPE-GC-NPD

Journal of the Brazilian Chemical Society

Carbo, Leandro¹  Universidade Federal de Sergipe, São Cristóvão, Brazil¹  Centro Universitário de Várzea Grande, Várzea Grande, Brazil¹  Universidade Federal de Mato Grosso, Cuiabá, Brazil¹  Navickiene, Sandro¹  Cunha, Marcelo L. F.¹  Dores, Eliana F. G. C.¹  De-Lamonica-Freire, Ermelinda M.¹  Ribeiro, Maria Lúcia¹  Universidade Estadual Paulista, Araraquara, Brazil¹ 

关键词: solid-phase extraction;    water;    herbicides;    pesticides;    GC-NPD;   

DOI  :  10.1590/S0103-50532006000500008

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

A study on the presence of herbicides, namely simazine, metribuzin, metolachlor, trifluralin, atrazine and two metabolites, deisopropylatrazine (DIA) and deethylatrazine (DEA), was performed in ground and surface waters from Primavera do Leste region, Mato Grosso state (Middle West of Brazil). The analytical procedure was based on solid-phase extraction (SPE) with Sep-Pak C18 disposable cartridges and ethyl acetate for elution solvent. Residue levels were determined by gas chromatography with nitrogen-phosphorus detection. For most of the pesticides average recoveries at different fortification levels were >70% with relative standard deviation <19%. The recoveries of DIA and trifluralin in water were 25% and 56%, respectively, which were attributed to the incomplete retention of DIA and strong retention on the sorbing material and high volatility of trifluralin. Detection limits ranged from 0.023 to 0.088 µg L-1. This method was applied for the analysis of 5 superficial water samples and 28 groundwater samples, in places used for human consumption without previous treatment, collected in Primavera do Leste, Mato Grosso, Brazil. Results indicated that the highest level of contamination in a water sample was 1.732 µg L-1 for metolachlor, while metribuzin was the most frequently detected herbicide with maximum concentration of 0.351 µg L-1.

【 授权许可】

Unknown