Distribuição do mercúrio em sedimentos de fundo no Estuário de Santos SP/Brasil

Garcia

Ecotoxicol. Environ. Contam.

et al. 2024

The Cubatão River is one of the most important waterways of the coast of São Paulo. The continuous discharge of domestic and industrial effluents into the river and its tributaries resulted in loss of water quality across the system. Industrial and domestic landfills are also located around the studied area. The purpose of this study was to assess two aspects of sediments from the river and two of its tributaries (Perequê and Pilões Rivers): presence of trace elements and toxic metals, and ecotoxicity. Four sampling surveys were conducted from 2010 to 2011 on six different sites (here named P0, P2, P4, P5, P7 and P8). Ecotoxicity was assessed by exposing Hyalella azteca to the collected sediments. Instrumental Neutron Activation Analysis (INAA) and Atomic Absorption Spectrometry (GF AAS and CV AAS) techniques were applied for measuring concentration of metals and trace elements. The latter enabled quantification of Cd, Pb and Hg, while the former enabled quantification of a wide range of metals and trace elements. As, Cr and Zn concentrations obtained by INAA as well as AAS results were compared to threshold effect levels (TEL) and probable effect levels (PEL), the sediment quality guidelines proposed by the Canadian Council of Ministers of the Environment (CCME) for evaluating the potential effects on aquatic organisms. Cd and Hg values did not exceed TEL at the most of samples. Pb exceeded TEL at only one site campaign. As, Cr and Zn values exceeded TEL in most of sampling sites, with P2 and P4 showing the highest concentrations. Enrichment Factor (EF) and Geoaccumulation Index (IGeo) were calculated for the elements determined by INAA using North American Shale Composite (NASC) and regional background values. In short, As, Br, Cr, Hf, Pb, Sb and Zn were the elements found in concerning amounts, especially As, Br, Cr and Zn. Toxicity results revealed toxic effects on sediments from P2 and P5 (mortality > 50%). Body size analysis demonstrated negative effects at P4 (length smaller than 2,500.00 µm). Data crossing analyses indicate As and Br as main possible contributors to high toxicity levels.

Section: Resultssupporting

confidence: 92%

Metals, trace elements and ecotoxicity in sediments of the Cubatão River, Brazil

Garcia

Ecotoxicol. Environ. Contam.

et al. 2024

Ecotoxicol. Environ. Contam.

“…The concentrations found by other authors in regions adjacent to this study, as well as in the Santos and São Vicente Estuary (Oliveira et al, 2005;Siqueira et al, 2005;Cesar et al, 2007;Choueri et al, 2010), based on the weight-of-evidence approach, provides a structure and a process for conducting sediment/ dredging material assessment that leads to a decision. The main structure consists of \"step 1\" (examination of available dataare much higher than those found in the Bertioga Channel.…”

Section: Resultsmentioning

confidence: 71%

Trace elements in an adjacent channel of an anthropized area: a case study of Baixada Santista, Southeastern Brazil

Salaroli¹,

Kim²,

Angeli³

et al. 2024

In recent decades, due to intensive industrialization, the Baixada Santista has undergone an intense process of environmental degradation. The metals are toxic and persistent in varying concentrations and oxidation states and may be incorporated in sediments and biota. Thus, understanding the importance of this contamination is necessary for coastal planning. This study provides a basis for understanding the levels of metal and As contamination in the Bertioga Channel (SP). The levels of Al, As, Cd, Cr, Cu, Fe, Mn, Ni, Pb, Sc, V and Zn in superficial sediment samples were determined by ICP-OES. The degree of sediment contamination was evaluated according to the sediment quality standards set by the Canadian environmental agency (ISQG and PEL) and by statistical tests. All values were below PEL, and most of the sample values were below ISQG, except for As, Cu and Pb. From a cluster analysis, it was possible to differentiate eastern and western parts of the channel due to their distinct hydrodynamic patterns. Furthermore, it was possible to separate the trace elements by geochemical behavior, in which Cu, Pb and Zn were linked to a small anthropogenic contribution. Thus, this study detected small anthropogenic contributions from an adjacent channel of an anthropized area, but most of the results were linked to natural geochemical processes.

“…1). São Vicente Estuary (SVE) is a part of the Santos Estuarine System, which is considered highly impacted by anthropic interventions and pollution (BOLDRINI;PEREIRA, 1987;MEDEIROS;BÍCEGO, 2004;SIQUEIRA et al, 2005;BÍCEGO et al, 2006;CESAR et al, 2006;HORTELLANI, et al, 2008;MARTINS et al, 2008;KIRSCHBAUM et al, 2009, SERIANI, et al, 2010. The SVE receives mainly domestic pollution from diffuse sources, specially sewage, stormwater and urban drainage, but contamination from domestic and industrial landfills is also considerable (LAMPARELLI et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Influence of seasonality and pollution on the hematological parameters of the estuarine fish Centropomus parallelus

et al. 2013

A B S T R A C TThis study investigated the hematological parameters of the tropical estuarine fish Centropomus parallelus and their use as a non-destructive biomarker for aquatic pollution. Individuals were collected, in summer and winter, at two estuaries, Cananéia (CAN) and São Vicente (SVE), and blood was extracted by caudal puncture. The evaluated parameters were hematocrit (Ht), red blood cells (RBC), Mean Corpuscular Volume (MCV), and the leukocyte (WBC) and thrombocyte counts. Fishes from CAN showed higher values of absolute number of thrombocytes in the summer. The fishes from SVE presented lower values of Ht and MCV in winter. Comparing the hematological parameters of fishes from these two sites, Ht, MCV, WBC and RBC were higher in fishes from SVE in the summer, whereas during the winter, Ht and thrombocytes were higher in animals from SVE. The results allow attributing the changes in the blood of fishes to seasonality and the presence of contaminants.