AVALIAÇÃO DE RESÍDUOS DE AGROTÓXICOS EM POLPAS DE MORANGO INDUSTRIALIZADAS

Samples of industrialized strawberry pulps, commercialized in Minas Gerais state, Brazil, were collected in the period from 2006 to 2007 by the Sanitary Surveillances, and were sent to Fundação Ezequiel Dias for analysis of pesticide residues. It was performed the extraction by multi-residue method with acetone, dichloromethane and hexane. The obtained extracts were analyzed by gas chromatography with detectors of electron capture (GC-ECD), flame photometric (GC-FPD), nitrogen phosphorus (GC-NPD), mass spectrometry (GC-MS) and high performance liquid chromatography (HPLC) with UV visible and fluorescence detectors. The results showed the inappropriate use of pesticides, which are not authorized as acephate, captan, chlorfenapyr, chlorpyrifos, dimethoate, omethoate, endosulfan, fenarimol, folpet, methamidophos, prochloraz and tetradifon, and the permitted ones azoxystrobin, difenoconazole, fenpropatrina, iprodione and procymidone. These indicate that good agricultural practices are not being followed by some producers, and demonstrate the necessity of processed food fiscalization, which will lead to products of better quality.Amostras de polpas de morango industrializadas, comercializadas no estado de Minas Gerais, foram coletadas no período de 2006 a 2007 pelas Vigilâncias Sanitárias e encaminhadas à Fundação Ezequiel Dias para análise de resíduos de agrotóxicos. Realizou-se a extração pelo método de multirresíduos com acetona, diclorometano e hexano. Os extratos obtidos foram submetidos à análise por cromatografia a gás com detectores de captura de elétrons (CG-DCE), fotométrico de chama (CG-DFC) e nitrogênio fósforo (CG-DNF), espectrometria de massa (CG-MS) e cromatografia a líquido de alta eficiência (CLAE) com detectores ultravioleta (UV) visível e fluorescência. Os resultados evidenciaram o uso inadequado de agrotóxicos, sendo detectados produtos não autorizados como acefato, captana, clorfenapir, clorpirifós, dimetoato, ometoato, endossulfam, fenarimol, folpete, metamidofós, procloraz e tetradifona e os autorizados azoxistrobina, difenoconazol, fenpropatrina, iprodiona e procimidona. Isso indica que as boas práticas agrícolas não estão sendo cumpridas por alguns produtores e mostra a necessidade de fiscalização de alimentos processados, o que levaria à oferta de produtos de melhor qualidade

Occurrence of pesticides from coffee crops in surface water

The excessive amount of pesticides applied in agricultural areas may reach surface water, thereby contaminating it. Thus, the main purpose of this study was to investigate the presence of pesticides used in a sub-basin headwater with coffee crops, situated in the Dom Corrêa district, Manhuaçu, Minas Gerais. The region of study is a great producer of coffee. Crops occupy steep areas and are situated close to surface water bodies. In this study, four sample collection points were selected in streams as well as a point in the distribution network and two points in the water treatment station (raw and treated water) a total of seven points. The samples were collected in rainy and dry seasons. Organochlorines, organophosphates, pyrethroids, carbamates and triazoles pesticides were identified by liquid and gas chromatography analysis with tandem mass spectrometry. The occurrence of pesticides was more evident in the rainy season. A total of 24 distinct pesticides were detected. At least one pesticide was identified in 67% of the samples collected during the rainy season and in 21% of the samples collected during drought. Many pesticides detected in water are not regulated in Brazilian legislation regarding potability