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1.
Arch Environ Contam Toxicol ; 79(4): 524-536, 2020 Nov.
Article in English | MEDLINE | ID: mdl-33150460

ABSTRACT

Anthropogenic interference the ecosystem unavoidably changes the physical and biological environment. The biodiversity of the Amazon region has been threatened by increased agricultural production and pesticide use. Considering that monitoring pesticides in environments close to their application is one of the ways to preserve the ecosystem, this study investigated the levels of pesticide residues in different environmental compartments (soil, sediment, and water samples). Thirty-one active ingredients of pesticides of different classes were analyzed by UHPLC-MS/MS. For this purpose, we performed quarterly collections in dry and rainy seasons in the region, which helped to evaluate the impact of pesticides on the biodiversity of the study site. Sampling points were the river banks in the area of an agricultural project in Formoso do Araguaia city, Tocantins State. After analysis, we detected the following substances in the water matrix: clomazone, fluazifop-p-butyl, flutolanil, metsulfuron-methyl, propanil, and imidacloprid. Nevertheless, we did not detect any active ingredient in sediment and soil matrices. The active ingredient clomazone was present in all points in the trials, with concentrations reaching up to 0.538 µg L-1. These substances have potential for groundwater contamination. Even at low concentrations in the aquatic ecosystem, these substances can damage human populations and wildlife species, given their toxicological classification. Thus, the study showed an environmental risk of bioaccumulation and/or biomagnification in the region, which may affect environmental biodiversity as well as human health.


Subject(s)
Pesticides/analysis , Water Pollutants, Chemical/analysis , Agriculture , Brazil , Ecosystem , Environmental Monitoring , Groundwater , Humans , Pesticide Residues/analysis , Rain , Rivers/chemistry , Seasons , Tandem Mass Spectrometry
2.
Chem Biodivers ; 17(4): e1900717, 2020 Apr.
Article in English | MEDLINE | ID: mdl-32069384

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-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.


Subject(s)
Carbamates/analysis , Geologic Sediments/chemistry , Rivers/chemistry , Soil Pollutants/chemistry , Thiocarbamates/analysis , Water Pollutants, Chemical/chemistry , Brazil , Carbamates/isolation & purification , Chromatography, High Pressure Liquid , Pesticides/analysis , Pesticides/chemistry , Soil Pollutants/analysis , Soil Pollutants/isolation & purification , Solid Phase Extraction , Tandem Mass Spectrometry , Thiocarbamates/isolation & purification , Water Pollutants, Chemical/analysis , Water Pollutants, Chemical/isolation & purification
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