Análise físico-química da qualidade da água do rio Itapecuru no município de Caxias-MA

Paula, Luciana Rocha; Cesar, Kellyane Karen Ferreira Aguiar; Batista, Anny Karoline Rodrigues; Siqueira, Francisléia Falcão França Santos; Silva, Letícia da; Filho, Daniel Limeira; Ferreira, Maria Fernanda Ribeiro; Almeida, Maria Aparecida de Gois; Nunes, Leonardo Andrade Gomes; Soares, João da Paixão; Azevêdo, Carlos Augusto Silva de; Silva, Francisco Laurindo da

doi:10.33448/rsd-v10i15.21973

Cited by 2 publications

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“…Nos pontos com presença de ações antropogênicas, notou-se a diminuição da concentração de OD, que é diretamente proporcionada pela pressão atmosférica, ou de maneira inversa a altitude, e de modo indireto proporcional a temperatura. A atenuação do OD pode acontecer por causas naturais, principalmente pela respiração de organismos aeróbicos ou pela decomposição da matéria orgânica pelos organismos existentes no ecossistema aquático (Paula et al, 2021).…”

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Concentração de Clorofila e Parâmetros Físico-Químicos para Avaliação de Níveis de Eutrofização do Rio Cereja Bragança-Pa

Ferreira

Soares

Damasceno

et al. 2022

Rev. Bras. Geog. Fis.

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O monitoramento das variáveis físicas e químicas da água, bem como a concentração de clorofila a presente na comunidade fitoplanctônica, pode fornecer subsídios às políticas de proteção ambiental. O objetivo do trabalho foi realizar uma avaliação do nível de eutrofização presente no Rio Cereja, em Bragança PA, através da aplicação do índice de clorofila a e parâmetros hidrológicos, correlacionando a eutrofização com ações antrópicas da região de entorno. Foram coletadas amostras de água na margem do rio em quatro estações fixas, em agosto de 2018. As estações possuíam setores com distintos níveis de impacto antrópico. Utilizou-se uma garrafa de Niskin para realizar as coletas de amostragens e posteriormente foram feitas análises em laboratório. Os valores obtidos de clorofila a foram usados conforme o cálculo do Índice do Estado Trófico (IET). Entre os valores de temperatura, o ponto 2 obteve menor valor (26,9°C), os pontos 3 e 4 apresentaram maiores valores (27,8°C). Entre os valores de pH, o ponto 1 foi o mais ácido com 5,7, por sua vez, o 3 e 4 foram os menos ácidos (6,3). O oxigênio dissolvido (OD), oscilou entre 1,13 mg/L-1 (Ponto 1) e 4,12 mg/L-1 (Ponto 3). As concentrações de clorofila a, tiveram menor concentração no Ponto 1 (0,0197 mg/m-3) e foi maior no Ponto 3 (0,033 mg/m-3). O Cereja apresentou nível de eutrofização ultra-oligotrófico. As análises de correlação mostraram correlação positiva entre fatores climáticos e físico-químicos sobre a biomassa fitoplanctônica. Foram sugeridas medidas para mitigar os danos causados pela deterioração do Rio Cereja.Palavras-chave: Parâmetros hidrológicos, Eutrofização, Qualidade da água.Chlorophyll Concentration and Physical-Chemical Parameters for Assessing Eutrophication Levels in the Cereja River, Bragança-Pa A B S T R A C TMonitoring the physical and chemical variables of the water, as well as the concentration of chlorophyll present in the phytoplankton community, can provide subsidies for environmental protection policies. The objective of this work was to carry out an evaluation of the eutrophication level present in the Cereja River, in Bragança PA, through the application of the chlorophyll a index and hydrological parameters, correlating eutrophication with anthropic actions in the surrounding region. Water samples were collected on the riverbank at four fixed stations in August 2018. The stations had sectors with different levels of anthropic impact. A Niskin bottle was used to carry out the sampling collections and later analyzes were carried out in the laboratory. The obtained values of chlorophyll a were used according to the calculation of the Trophic State Index (TSI). Among the temperature values, P2 was the one with the lowest value with 26.9°C, whereas P3 and P4 were the points with the highest values (27.8°C) each. Among the pH values, P1 was considered the most acidic with 5.7, in turn, P3 and P4 were the least acidic (6.3). Dissolved oxygen (OD) ranged between 1.13 mg/L-1 (P1) and 4.12 mg/L-1 (P3). Chlorophyll a concentrations were lower in P1 (0.0197 mg/m-3), and higher in P3 (0.033 mg/m-3). Cherry presented an ultra-oligotrophic level of eutrophication. Correlation analyzes showed a positive correlation between climatic and physicochemical factors on phytoplankton biomass. Measures were suggested to mitigate the damage caused by the deterioration of the Cereja River.Keywords: Hydrological parameters, Eutrophication, Water quality

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Section: Resultsunclassified

Concentração de Clorofila e Parâmetros Físico-Químicos para Avaliação de Níveis de Eutrofização do Rio Cereja Bragança-Pa

Ferreira

Soares

Damasceno

et al. 2022

Rev. Bras. Geog. Fis.

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“…Barbosa and da Silva Filho (2018), signaled the occupation of the land, promoted by intense urbanization and agricultural activities from the 1980s and 1990s, as an aggravating factor of soil sealing, generating the increase of sediments for the rivers, impairing the quality of the waters. Irregular human actions are also pointed out by Paula et al(2021), inferring the processes of the physical environment such as erosion and silting as the destruction of waterways.…”

Section: Resultsmentioning

confidence: 99%

Influence of watershed land use on water quality in the state of Santa Catarina, Brazil

Vieira

Ribeiro

2022

GES

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The inappropriate use of water resources by human actions compromises the balance between natural and anthropogenic factors. In this study, exploratory and field research were conducted with a scope of quantifying, based on satellite imaging, the use and occupation of land on the banks of the Itajaí-Açu River, the largest watercourse in the Itajaí River Basin, located in the State of Santa Catarina, Brazil. Five sampling points were allocated along the river at different times of the year to analyze water quality using chemical and biological indicators. The characterization of land use and occupation was carried out with Sentinel-2B satellite images at 10m resolution and QGIS software. Version 3.6.3 of the R Software was used to consolidate the data. The land use was categorized into several classes, the most representative of which was vegetation, which presented coverage of 34.42%, followed by the pastures and open fields class, with 27.83%, agriculture, with 18.18%, and urban areas, with 16.59% coverage. Our study showed that 62.6% of the river’s base was affected by anthropogenic influence, characterizing an environment severely altered from its normal state. The results obtained in the statistical analysis revealed a directional correlation between land use and water quality, thus indicating that cities on the banks of watercourses are major sources of potential contaminants. Among the classes of land use, the presence of vegetation along the riverside territory attenuated part of the load of pollutants launched into the Itajaí-Açu River. This finding highlights the importance of conserving the vegetation alongside the river to maintain water quality and, consequently, preserve the ecosystem’s biota.

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Análise físico-química da qualidade da água do rio Itapecuru no município de Caxias-MA

Cited by 2 publications

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Concentração de Clorofila e Parâmetros Físico-Químicos para Avaliação de Níveis de Eutrofização do Rio Cereja Bragança-Pa

Concentração de Clorofila e Parâmetros Físico-Químicos para Avaliação de Níveis de Eutrofização do Rio Cereja Bragança-Pa

Influence of watershed land use on water quality in the state of Santa Catarina, Brazil

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