THEORETICAL ESTIMATE AND MULTIRESIDUE ANALYZE USING SPME-GC-IT/MS/MS FOR MANAGEMENT OF PESTICIDES IN WATER OF THE RURAL ZONE OF CEARÁ, BRAZIL

Resumen

The paper aimed to evaluate the pesticide contamination in groundwater and surface waters in Iguatu, important city of High Jaguaribe basin, in the rural zone of Ceará, Brazil.  United States Environmental Protection Agency (USEPA) model, Groundwater Ubiquity Score (GUS) index (groundwater) and GOSS method (surface water) were applied to analyze the theoretical risk of contamination of water. A survey of the main active ingredients used in local crops was performed through and data collection with producers of the region.  Significant percentage of substances was considered high toxicity (I and II). About 40% of the pesticides investigated showed high potential of contamination in groundwater, according EPA and GUS index.  Evaluation by GOSS method showed high risk of contamination in surface waters to clethodim, lambda-cyhalothrin, paraquat, atrazine and picloram. Screening of residues using solid phase microextraction (SPME) and gas chromatography mass spectrometry (GC-IT/MS/MS) was satisfactory. It was not detected presence of pesticides in surface water and groundwater samples of rural zone of Ceará, Brazil. The toxic residues management is important to ensure the quality of water resources and the environment.