Spatial and temporal evaluation of the water quality index and trophic state index of the Curuçá River, Maranhão, Brazil

Abstract

This work aimed to evaluate the seasonal variations in the Water Quality Index and Trophic State Index in a given period. Physical and chemical analyses were performed according to APHA 2012 methods for water samples collected from the Curuçá River. The physicochemical parameters analyzed were temperature, pH, turbidity, total dissolved solids, conductivity, dissolved oxygen, biochemical demand, nitrite, nitrate, and total phosphorus; the results showed that there was significant variation between all the points collected in the dry periods and those established by the CONAMA 357/05. For the WQI, water was in the category of good to optimal, while according to the TSI, the aquatic environment of the Curuçá River was classified as ultraoligotrophic. Non-compliance with environmental norms for nutrients and bacteria was observed. Therefore, the presence of Escherichia coli with a value of <1000 CFU/100 mL was detected. The data were compared to the CONAMA 357/05, which showed that the data were inadequate for the maintenance of aquatic life. This analysis made it possible to verify the quality of this water, which is of environmental and socioeconomic interest to the population of the region where the springs will have to be preserved to improve the quality of the water.

Penilaian Kualitas Air Tanah dan Pengaruhnya terhadap Kesehatan Masyarakat di Kecamatan Sukun Kota Malang

“…Perhitungan nilai WQI (Water Quality Index) yang dilakukan akan mendapatkan hasil berat kadar dari parameter yang terkandung dalam kualitas air tanah dangkal pada sumur milik warga di Kecamatan Sukun yang akan dimasukkan pada Tabel 4. merupakan dasar yang baik untuk pengambilan keputusan (Souza et al, 2018). Dari data yang diperoleh, kualitas air tanah dangkal di Kecamatan Sukun termasuk dalam kategori baik, dilihat Tabel 4., dari 11 sumur yang diuji hanya terdapat 3 sumur warga yang memiliki air tanah dengan kategori 'baik' yaitu di Kelurahan Ciptomulyo, Kebonsari, dan Bangkalankrajan.…”

Caracterização físico-química e microbiológica da água do mar de praias do litoral de Pernambuco

“…Entretanto, o ponto P3 apresentou resultado elevado para os valores de cloretos (Cl -), Sulfatos (SO4 2-) e sódio (Na + ) conforme demonstrado na Tabela 2. De acordo com de Souza, et al, (2018), a presença de cloretos, fósforo, nitritos e nitratos são fatores indicativos de eutrofização desse ecossistema, logo há maior produção de matéria orgânica do que seu consumo e decomposição. Podem ser provenientes de fontes naturais como composição das rochas e carreadas por escoamento superficial de águas pluviais, material particulado presente na atmosfera, como também de fontes artificiais, como esgoto doméstico, remoção de areia.…”

Groundwater quality characterization using an integrated water quality index and multivariate statistical techniques

“…Cluster Analysis (CA) identifies variable groupings by assessing proximity among WQ components based on specific features [50][51][52]. Combining the WQI index with GIS offers a comprehensive depiction of fluctuations in GWQ traits.…”