Avaliou-se a forma de utilização de pesticidas nos pólos de produção da Ilha de São Luís (MA), Brasil. Foram analisadas algumas hortaliças cultivadas tendo sido detectados resíduos do inseticida organofosforado Metamidofós em amostras de tomate, pimentão e coentro. Embora os níveis de contaminação tenham sido relativamente baixos, a presença do pesticida atesta a falta de informação do pequeno produtor rural que aplica agrotóxicos de forma indiscriminada, sem obedecer os períodos de carência para cada cultura. USE OF ORGANOPHOSPHORUS INSECTICIDES IN THE PRODUCTION POLES OF SÃO LUÍS (MA - BRAZIL): WORK CONDITIONS AND GREENSTUFF CONTAMINATION Abstract The pesticide ways of utilization in production poles of São Luís, Maranhão state, Brazil were evaluated. Some cultivated greenstuff were analyzed and it was detected Methamidophos organophosphorous insecticide residues in tomatoes, chili and parsley samples. Although contamination levels were relatively low, the presence of the pesticide indicates the lack of basic information of the farmers, which apply agrochemicals indiscriminately without following the correct application periods for each culture.
A Barragem de Boa Esperança constitui importante potencial hídrico, social e econômico para a região Nordeste do Brasil, necessitando de monitoramento constante. Amostras de água e sedimentos foram coletadas e os princípios ativos Monocrotofós, Pirimicarb, Carbendazim, Triclorfon e Fenvalerato analisados por cromatografia a gás. Utilizou-se metodologia multirresíduo para extração dos pesticidas (FDA modificado) e cromatografia a gás (CG DCE/DFC). A metodologia forneceu eficiência e linearidade, com recuperações entre 69 e 86% para amostras fortificadas. Fenvalerato e Triclorfon foram detectados em dois pontos de coleta de amostras. Não foram detectados nenhum dos pesticidas em amostras de sedimentos. ANALYSIS OF PESTICIDES IN ENVIRONMENTAL SAMPLES (WATER AND SEDIMENTS) OF THE BOA ESPERANÇA BARRAGE: BRAZIL - PI/MA: PRELIMINARY AVALIATION Abstract Boa Esperança barrage is a very important social and economical region for northeast of Brazil, and it needs continuous enviromental monitoring. Water and sediments samples were collected in order to determine the most commonly used pesticides Monocrotophos, Pirimicarb, Carbendazim, Trichlorfon and Fenvalerate. It was employed the modified FDA multiresidue extraction method, followed by gas chromatography analysis (GC FID/ FPD). This method provided good efficiency and adequate linearity, with recovery ranging from 69 to 86% for fortified samples. Fenvalerate and Trichlorfon were detected in two points of sampling. The selected pesticides have not been detected in sediments.
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