Abstract
An analytical methodology to determine Alachlor, Butralin, and Metolachlor herbicides, and Metalaxyl fungicide, in surface water was developed using Solid Phase Microextraction (SPME) and Gas Chromatography coupled to Mass Spectrometry (GC-MS). The developed method was validated, and the quantification limits were found to be between 0.2 to 1.8 μg.L -1 , depending upon the compound. The precision, as measured by the relative standard deviations (RSD), was in the range 3.5% to 27%. The higher RSD was found for Butralin due to the occurrence of adsorption of this compound in the extraction fiber. After validation the developed methodology was employed to the determination of these four pesticides in water samples that supplies Araraquara and Sao Carlos cities (Sao Paulo - Brazil). Samples from Feijao Creek, Anhumas Creek, Cruzes Creek and Paiol Brook, as well as samples from after-treatment at SAAE (Water and Sewer Supply Service – Sao Carlos, SP, Brazil) and DAAE (Water and Sewer Supply Department – Araraquara, SP, Brazil) were evaluated. Samples from both winter and summer seasons were collected and analysed. The results show that the samples analyzed using the in-house validated methodology were not contaminated with these pesticides within the investigated concentrations.
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