Determination of Carbamates and Thiocarbamates in Water, Soil and Sediment of the Formoso River, TO, Brazil

Abstract

Considering the increase in agricultural production in Brazil, the use of pesticides for this production, and that there are no studies on pesticides in the region, the presence of carbamates and thiocarbamates was investigated in different environmental compartments of the Formoso River, TO, Brazil, by UHPLC/MS/MS. The collections were made on the banks of this river, in the area of influence of the agricultural project. The active principles were not found in the soil and sediment samples, only the propoxur principle was found in the water, reaching values of up to 0.025 μg L À 1 . It was found that the biodiversity of the Tocantinense savannah is under threat, because even though only one of the substances surveyed, propoxur and its derivatives, has been detected, they are substances of high toxicity and tendency to contaminate surface and groundwater to varying degrees and irreversible damage to different species.

Monitoramento e avaliação da qualidade hídrica do Rio Formoso - TO, Brasil usando índices de macroinvertebrados

“…Nesta tabela pode ser verificado que, independente no período seco ou chuvoso a qualidade da água do rio piora à medida que este passa a margem do projeto agrícola, tendo seu pior índice o P5 amostrado. Guarda et al (2020aGuarda et al ( , 2020bGuarda et al ( , 2020c, em seus estudos de monitoramento de pesticidas em diferentes compartimentos ambientais, detectaram presenças de pesticidas em água superficial no Rio Formoso, assim como no solo as margens do rio, nos mesmos pontos amostrados. Corroborando a presença de poluição por compostos orgânicos, verificados neste estudo.…”

Concentrações de metais tóxicos em água, solo e sedimento do rio Formoso, TO

“…Com exceção dos resultados encontrados para o Ba que são mais altos no P1, os valores encontrados para na água são mais altos em pontos localizados a margem do projeto agrícola P4 e P5, ou seja, onde a plantio se dá mais próximo as margens do Rio e especificamente nestes pontos em locais onde não ocorre a presença de mata ciliar, podendo este fator favorecer a alta concentração de metais nestes pontos amostrados. Guarda et al (2020a), Guarda et al (2020b), Guarda et al (2020c), também encontraram na região de estudos e nesses pontos amostrados contaminação da água por diferentes classes de agrotóxicos provenientes da atividade agrícola na região.…”

“…Estudos na região também mostraram nestes pontos amostrados contaminantes orgânicos de diferentes classes de agrotóxicos, no solo, porém no sedimento não foram encontradas essas substâncias. (Guarda et al, 2020a;Guarda et al, 2020b;Guarda et al, 2020c).…”

Determination of Pesticides in Soybean Seeds Incorrectly Discarded Near a Spring of the Paranaíba River, GO‐Brazil

“…Among the most common forms of water contamination by pesticides are soil leaching and surface runoff. [7,[20][21][22][23][24] Several researches have shown the importance of monitoring carbamates and benzimidazole in water, as for example, in the research of Guarda and collaborators, [7] who performed monitoring in Rio Formoso in Brazil, and it was detected the presence of propoxur in the water reaching a concentration of up to 0.025 μg L À 1 . As for carbendazim, it has been detected at up to 64 sites in the Ergene River in Turkey with a concentration between 0.03 and 6.33 μg L À 1 and in the Jucar River in Spain.…”

“…[5] At this juncture, carbamates and benzimidazoles, one of the main classes that have their toxic agents related to environmental crimes and against human health, and can cause acute intoxication in accidental situations or with criminal purpose, and even suicide attempts, given the high toxicity of compounds belonging to these groups. [6][7][8] The increasing number of pesticides that have been registered in Brazil in recent years has been worrying doi.org/10.1002/cbdv.202100560 public health and biodiversity, since these chemicals are responsible for several animal deaths, intoxication of humans, and destruction of flora. In the year 2019 we had a record in the series of approved pesticides, some of these products are extremely toxic, and are already banned in countries, such as the United States and the European Union.…”