Luane Souza de Araújo

The Brazilian savanna (Cerrado Biome) is one of the most important regions in the world in terms of food production, with the use of fertilizers based on nitrogen, phosphorus and potassium (NPK). When not applied properly, fertilizers can alter and affect water quality. The objective of this study was to evaluate the presence of these compounds in surface and groundwater in the Upper Jardim River Hydrographic Unit, Federal District, thus characterizing seasonal variations during the dry and rainy seasons in two periods. A total of 207 groundwater samples and 23 surface water samples were collected in the years 2014, 2015, 2019 and 2020. The parameters analyzed were pH and nitrate, nitrite, ammonium, phosphate and potassium ions. In groundwater samples, pH values were significantly higher and ion levels lower in samples collected during the early years (except for nitrate), and the ammonium concentrations were lower in the dry season than the rainy (in 2014 and 2019). In surface samples, total phosphorus levels were significantly higher in the rainy/2019 compared to the rainy/2020 season, while this tendency was inverted for potassium during the dry season. The use of NPK-based fertilizers has increased considerably in recent years in the region due to the expansion of the agricultural area, and although the results of the study show that concentrations in water are much lower than the maximum values allowed by Brazilian legislation, continuous monitoring is necessary to guarantee water quality.

Este estudo tem como objetivo construir um quadro de dimensões, indicadores e variáveis que permitam evidenciar as condições de sustentabilidade socioeconômica de periódicos científicos de acesso aberto (AA) no contexto brasileiro. O desenho da pesquisa envolve uma fase inicial de identificação de indicadores a partir da literatura e das práticas de publicação científica, e uma fase secundária de teste desses indicadores com base na coleta de dados em periódicos científicos brasileiros AA. Espera-se que este estudo possa contribuir para o aprimoramento de políticas e procedimentos editoriais, estratégias de financiamento e de modelagens de negócio referentes a periódicos AA com vistas a assegurar sua sustentabilidade e resiliência ao longo dos anos.