
Devido ao crescimento da produção agrícola, houve a necessidade de aumentar o uso de agrotóxicos para o controle de pragas. Nesse cenário, o Brasil ocupa o primeiro lugar no ranking mundial desde 2008, algo preocupante devido aos problemas ocasionados à saúde humana e ao meio ambiente. A cenoura é consumida pelos brasileiros e, segundo a Agência Nacional de Vigilância Sanitária (ANVISA), no último Programa de Análises de Resíduos de Agrotóxicos (PARA) – plano plurianual 2017-2022, foram constatadas detecções irregulares do agrotóxico clorpirifós, proibido para o cultivo da cenoura. Nesse sentido, para analisar as amostras de cenouras comercializadas na cidade de Itumbiara, Goiás, Brasil, realizaram-se a otimização e a validação do método de Extração Sólido-Líquido com Partição à Baixa Temperatura (ESL-PBT). Os resultados demonstram que o método é eficaz, visto que todos os parâmetros analisados, como seletividade, linearidade (r=0,9968), precisão (Desvio Padrão Relativo –DPR < 20%), exatidão (99,45% de recuperação do agrotóxico), Limite de Detecção e Quantificação (LD e LQ) de 0,05 mg L-1 e 0,15 mg L-1 estavam em conformidade ao permitido para validação de métodos analíticos. Após otimização e validação, coletaram-se quatro amostras de cenoura em quatro pontos comerciais diferentes e submetidas ao método otimizado. Após as análises, notou-se que as amostras de cenoura em todos os pontos comerciais estavam contaminadas com o agrotóxico clorpirifós, em concentrações que variaram de 0,80 a 2,76 mg de clorpirifós por kg de cenoura, aspecto preocupante porque o agrotóxico não é permitido para essa cultura, com a possibilidade de causar consequências à saúde humana e ao meio ambiente. Palavras-chave: Toxicidade. Contaminação. ESL-PBT. Abstrat Chlorpyriphos in carrots: optimization, validation and analysis of real samples Due to the growth in agricultural production, there was a need to increase the use of pesticides for pest control. In this scenario, Brazil has been ranked first in the world since 2008, which is worrying due to the problems caused to human health and the environment. Carrots are consumed by Brazilians and, according to the National Health Surveillance Agency (ANVISA), in the last Pesticide Residue Analysis Program (PARA) – multi-year plan 2017-2022, irregular detections of the pesticide chlorpyrifos, which is prohibited for carrot cultivation, were found. In this sense, to analyze the carrot samples sold in the city of Itumbiara, Goiás, Brazil, the optimization and validation of the Solid-Liquid Extraction with Low Temperature Partition (ESL-PBT) method were carried out. The results demonstrate that the method is effective, since all the parameters analyzed, such as selectivity, linearity (r = 0.9968), precision (Relative Standard Deviation – RSD < 20%), accuracy (99.45% recovery of the pesticide), Limit of Detection and Quantification (LD and LQ) of 0.05 mg L-1 and 0.15 mg L-1 were in accordance with what is permitted for validation of analytical methods. After optimization and validation, four carrot samples were collected from four different commercial points and submitted to the optimized method. After the analyses, it was noted that the carrot samples from all commercial points were contaminated with the pesticide chlorpyrifos, in concentrations ranging from 0.80 to 2.76 mg of chlorpyrifos per kg of carrot, a worrying aspect because the pesticide is not permitted for this crop, with the possibility of causing consequences to human health and the environment. Keywords: Toxicity. Contamination. SLE-LTP.
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