Concentração De Metais Pesados Nos Sedimentos Da Bacia Hidrográfica Do Rio Ponte Grande No Município De Lages/Sc

Lavnitck, Lais; Becegato, Valter Antônio; Vilela, Pamela Bicalli; Baum, Camila Angélica; Duminelli, Eduardo Costa; Toniazzo, Fabiane; Paulino, Alexandre Tadeu

doi:10.22533/at.ed.5722001075

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“…The concentration of Zn in the sediment collected from C1 (30 mg Zn/kg) exceeded the QRV (29.0 mg Zn/kg, FEPAM, 2014); this increase can be attributed to the application of fertilizer in the conventional field. In the study by Lavnitcki et al (2020) in the Ponte Grande River Basin (Lages/SC), Zn concentration in the sediments ranged from 57.86 to 210.90 mg Zn/kg between the sampled points, being found in springs, junctions and mainly in urbanized areas due to the release of domestic effluents and rainwater. Sanches Filho et al (2015) conducted a study on the São Lourenço River (RS) and found high Zn concentrations (between 27.9 and 83.6 mg Zn/kg) for most of the sampling points; however, the high concentrations were Rev.…”

Section: Discussionmentioning

confidence: 95%

Assessment of water and sediment quality variation due to organic and conventionally irrigated pre-germinated rice-field cultivation

Jesus¹,

Longoni²,

Vargas³

et al. 2022

Rev. ambiente água

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This study evaluated the water and sediment quality of samples collected from different points in organic (O1, O2, O3, and O4) and conventional (C1, C2, and C3) pre-germinated rice fields located in Viamão/RS. Quality indicators such as phosphorus, dissolved oxygen, manganese, iron, turbidity, and BOD5 reduced water quality beyond Classes 3 and 4, as defined by CONAMA Resolution 357/2005. Based on the aluminum levels, the water samples collected from all the points were categorized as Class 4; furthermore, the IQA classified the quality of water samples from Points O4 and C1 as “bad.” The COD/BOD ratio was high, demonstrating that the biodegradable fraction was considerably low. The conductivity of water at points O4, C1, C2, and C3, exceeded 100 µS/cm, as defined by CETESB, indicating impacted environments. The levels of zinc in C1 and nickel in O2, C2, and C3 in the sediment exceeded the quality reference values established by the FEPAM Ordinance 85/2014. In general, the lowest water quality was observed in the samples collected from Points O2 and O4, and the lowest sediment quality was observed in the samples collected from all points in the conventional rice fields and from Point O2 in the organic rice field. Keywords: CETESB, coliforms, CONAMA no 357/2005, FEPAM Ordinance no 85/2014, irrigated rice, physicochemical analysis.

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Section: Discussionmentioning

confidence: 95%