On site stripping voltammetric determination of Zn(II), Cd(II) and Pb(II) in water samples of the Cananéia-Iguape Estuarine-Lagoon complex in São Paulo state, Brazil

Abstract

Os sistemas estuarinos desempenham um importante papel na retenção de elementos traços devido à afinidade destes com algumas partículas dissolvidas em água. Nesse trabalho, apresentase o uso de um sensor voltamétrico para monitorar as concentrações de Zn (II), Cd(II) e Pb (II) na região do Sistema Estuarino Lagunar de Cananéia-Iguape (estado de São Paulo). No setor sul, (Cananéia) obteve-se menores valores de concentração, e no setor norte (Iguape) os valores foram maiores devido às atividades antrópicas, com ênfase à introdução prévia de resíduos de mineração e insumos de efluentes agrícolas, industriais e domésticos. O método proposto é viável, barato e rápido, e permite a determinação dos íons metálicos simultaneamente. Além disso, o dispositivo portátil é simples e pode ser facilmente utilizado para medições de campo a bordo de navios oceanográficos.Estuarine systems play an important role in the retention of toxic trace elements owing to the affinity of these elements with particles dissolved in water. This work presents the use of a voltammetric sensor to monitor heavy metal (Zn (II), Cd(II) and Pb (II)) concentrations in the Cananéia-Iguape Estuarine-Lagoon region (São Paulo State, Brazil). Lower concentrations were found in the Southern estuarine system (Cananéia City) and increased concentrations observed in the Northern sector (Iguape City) were promoted by anthropogenic activities, with particular influence from the historical introduction of mining wastes and inputs from agricultural, industrial and domestic effluents. The proposed method is reliable, inexpensive and fast, can simultaneously provide information on the concentration of these metallic ions and can be easily used for field measurements aboard oceanographic ships.

Short-Term Phytoplankton Dynamics in Response to Tidal Stirring in a Tropical Estuary (Southeastern Brazil)

“…Phytoplankton is responding with higher densities to eutrophication in these estuarine systems, which differ in their geomorphology as well as in the anthropogenic pressure and nutrient sources (PARANHOS et al, 1998;SOUZA et al, 2012).…”

Anthropogenic influence on silicon behavior in an estuary member of the Biosphere Reserve in Southeastern Brazil

“…Previous reports by DAEE (1989) indicated salinity values between 16 and 34 when the Valo Grande Channel was closed and between 0 and 32 when it was open. Seasonally, Souza et al (2012) observed lower salinity values in the Cananéia sector during summer compared to winter, possibly due to high rainfall and increased freshwater influence in the southern sector. pH values were generally around 8, except in areas influenced by river waters, where pH decreased below 8, primarily in the northern part of the system.…”

Research in a RAMSAR site: The Cananéia-Iguape-Peruíbe estuarine-lagoon complex, Brazil

“…Some previous studies carried out in the CIELC have monitored the environmental properties of this region, such as Besnard (1950), Kato (1966aKato ( , 1966bKato ( , 1966c, Teixeira (1968), Tundisi and Teixeira (1968), Miyao et al (1986), Miyao and Harari (1989), Braga (1995), Tessler and Souza (1998), Braga and Chiozzini (2008), and Maluf (2009). In recent decades, several scientific studies have been carried out to understand the oceanographic dynamics of the CIELC, considering the circulation patterns of the adjacent shelf and tidal inflows (Camargo and Harari, 1994;Mesquita and Harari, 2003); the physical and chemical properties of the water Chiozzini et al, 2010;Azevedo and Braga, 2011;Aguiar et al, 2013;Souza et al, 2011aSouza et al, , 2011bEschrique et al, 2014;Haytsmann, 2018;Mindaugas et al, 2023); sedimentary and geomorphological characterization and metal inputs (Mahiques et al, 2009;2013;2014;Cornaggia et al, 2018;Tramonte et al, 2018); geochemical aspects (Amorim, et al 2008;Barcellos et al, 2005;Aguiar et al, 2008;Perretti and Braga, 2022;Sutti et al, 2022;Millo et al, 2021); the composition of the ichthyofauna (Sadowsky, 1974;Tanji, 1981, 1983;Rios, 2001;Contente, 2013;<...…”