Paraquat-loaded alginate/chitosan nanoparticles: preparation, characterization and soil sorption studies.

The widespread use of pesticides in agriculture can lead to water contamination and cause adverse effects on non-target organisms. Brazil has been the world's top pesticide market consumer since 2008, with 381 approved pesticides for crop use. This study provides a comprehensive literature review on the occurrence of pesticide residues in Brazilian freshwaters. We searched for information in official agency records and peer-reviewed scientific literature. Risk quotients were calculated to assess the potential risk posed to aquatic life by the individual pesticides based on their levels of water contamination. Studies about the occurrence of pesticides in freshwaters in Brazil are scarce and concentrated in few sampling sites in 5 of the 27 states. Herbicides (21) accounted for the majority of the substances investigated, followed by fungicides (11), insecticides (10) and plant growth regulators (1). Insecticides are the class of major concern. Brazil would benefit from the implementation of a nationwide pesticide freshwater monitoring program to support preventive, remediation and enforcement actions.

Pesticides in Brazilian freshwaters: a critical review.

Controlled release system for ametryn using polymer microspheres: preparation, characterization and release kinetics in water.

Subchronic exposure to atrazine induces biochemical and histopathological changes in the gills of a Neotropical freshwater fish, Prochilodus lineatus.

Human health risk assessment and environmental distribution of trace elements, glyphosate, fecal coliform and total coliform in atlantic rainforest mountain rivers (south America)

SPATIAL-TEMPORAL DIAGNOSTIC OF HERBICIDE OCCURRENCE IN SURFACE WATERS AND SEDIMENTS OF CORUMBATAI RIVER AND MAIN AFFLUENTS. Residues of herbicides from sugarcane were monitored in waters and sediments of Corumbatai River and tributaries. Ametryne, atrazine, simazine, hexazinone, glyphosate, and clomazone were detected in water samples, with negligible levels of ametryne and glyphosate in sediment samples. The area of recharge of the Guarani aquifer presented the highest triazine and clomazone levels. The triazines were detected at higher levels, with atrazine above Brazil's potability and quality standards. Total herbicide levels at some sampling points were 13 times higher than the European Community potability limit. There is no Brazilian standard for ametryne, although the risk is larger due to ametryne's higher toxicity for the aquatic biota.

/pdf/diagnostico-espaco-temporal-da-ocorrencia-de-herbicidas-nas-18jyn37tgs.pdf

Penna Firme

Papers

Diagnóstico espaço-temporal da ocorrência de herbicidas nas águas superficiais e sedimentos do Rio Corumbataí e principais afluentes