Distribution of particulate trace metal in the southern part of the Patos Lagoon estuary

Niencheski, Luís Felipe Hax; Baumgarten, M.G.Z

doi:10.1016/s1463-4988(00)00041-5

Cited by 18 publications

(10 citation statements)

References 10 publications

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“…5). Mn correlated negatively with F1, a finding which suggests that the positive correlations mentioned above indicate an anthropic component, since Mn naturally occurs in high concentrations and is not typically associated with human activity (Niencheski et al, 1994). These findings are consistent with the EF results, which showed enrichment of metals in sediments from P2 and P8 (Table 4).…”

Section: Integration Of Geochemical and Ecotoxicological Datasupporting

confidence: 87%

Using an integrated approach to assess the sediment quality of an estuary from the semi-arid coast of Brazil

Souza

Araujo

Cruz

et al. 2016

Marine Pollution Bulletin

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The Jundiaí-Potengi Estuary (JPE) on the semi-arid coast of Brazil is influenced by multiple sources of pollution. Sediment quality at 10 JPE sites was evaluated through an integrated approach. Rainy and dry seasons were considered. Collected sediments were analyzed for texture, metal, nitrogen, phosphorus concentrations, and toxicity to invertebrates. Geochemical and ecotoxicological data were integrated using qualitative approaches and multivariate techniques. We observed decreased sediment quality in both seasons, particularly in the mid-estuary. In the dry season, the contamination-toxicity relationship was clearer, as hydrological conditions favor contaminant retention within the estuary. Rainy season conditions were found to be worse, since stormwater drainage from agricultural and urban areas carries the contamination into the estuary. Because of the contamination sources and dissolved and particle-bound metal transport, contamination and toxicity did not correlate as clearly in the rainy season. The results suggest that unmeasured contaminants are contributing to JPE sediment degradation.

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Section: Integration Of Geochemical and Ecotoxicological Datasupporting

confidence: 87%

Using an integrated approach to assess the sediment quality of an estuary from the semi-arid coast of Brazil

Souza

Araujo

Cruz

et al. 2016

Marine Pollution Bulletin

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“…Heavy metals are the chemical elements that currently correspond to the generic term of ETM, these elements actually designate a large number of metals with an interest more and more important in the life of modern societies and toxic nature to the environment and to humans [Niencheski and Baumgarten 2000].…”

Section: Introductionmentioning

confidence: 99%

Heavy Metals Chelating Ability and Antioxidant Activity of Phragmites Australis Stems Extracts

Sellal¹,

Belattar²,

Bouzidi³

2019

J. Ecol. Eng.

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In this study, the ability of hexane (HSE), chloroform (CSE), ethyl acetate (EASE) and methanolic (MSE) stems extracts from Phragmites australis or EDTA (as standard) to chelate iron using ferrozine method or zinc and copper using the murexide method is carried out in vitro. When the increased volumes of the HSE studied were taken from a stock solution of a fixed concentration 1 mg/ml at 25-175 μl for the iron and zinc chelating assay, 1-7 mg/ml for the copper chelating assay gave a significant (p≤ 0.01) activity. The obtained results showed that the HSE have the highest capacity to chelate ferrous ions below the EDTA (standard chelator) with absorbance arrive to the lesser extent 0.24±0.005, 0.04±0.013 which expresses 86% and 97% (compared to the control) of inhibition, respectively. For the murexide chelation, the results obtained also showed that the HSE and EDTA have a good (p≤ 0.01) chelating dose dependent effect towards zinc and copper ions with increased absorbance 0.45±0.02 and 0.42±0.02 with 54% and 56% of inhibition, respectively, for the zinc chelation and 0.66±0.03, 0.13±0.005 represent 44% and 88% for copper chelation. In contrast to the antioxidant capacity, the extract of hexane, ethyl acetate, chloroform and methanol from leaves, stems and roots of the Phragmites australis plant have a very low scavenger effect to the radical DPPH where the maximum inhibition is approximately 13.79%, obtained with the maximum volume. Finally, the HPLC analysis of effective extract (HSE) confirmed the presence of oxalic, citric, malic, succinic, fumaric, formic, acetic, propionic and butyric or iso butyric acid.

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“…While there are important natural sources of copper, multiple human activities (industries, agriculture, harbors) have considerably increased the input of this metal in estuarine and marine environments around the world (Flegal and Sanudo-Wilhelmy, 1993;van Geen and Luoma, 1999;Niencheski and Baumgarten, 2000;Morillo et al, 2005;Niencheski et al, 2006;D'Adamo et al, 2008). For example, in Patos Lagoon estuary (Southern Brazil), the largest coastal water body in South America, an increase of approximately 15-fold in copper concentration in water has been documented in the last 20 years (Seeliger and Knak, 1982;Baumgarten and Niencheski, 1998).…”

Section: Introductionmentioning

confidence: 99%

Acute toxicity, accumulation and tissue distribution of copper in the blue crab Callinectes sapidus acclimated to different salinities: In vivo and in vitro studies

et al. 2011

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In vivo and in vitro studies were performed to evaluate acute toxicity, organ-specific distribution, and tissue accumulation of copper in Callinectes sapidus acclimated to two different experimental salinities (2 and 30 ppt). Blue crabs were quite tolerant to copper. Acute dissolved copper toxicity (96-h LC(50) and its corresponding 95% confident interval) was higher at salinity 2 ppt (5.3 (3.50-8.05) μM Cu) than at 30 ppt (53.0 (27.39-102.52) μM Cu). The difference between salinities can be completely explained based on the water chemistry because it disappeared when 96-h LC(50) values were expressed as the free Cu(2+) ion (3.1 (1.93-4.95) μM free Cu at 2 ppt versus 5.6 (2.33-13.37) μM free Cu at 30 ppt) or the Cu(2+) activity (1.4 (0.88-2.26) μM Cu activity at 2 ppt versus 1.7 (0.71-4.07) μM Cu activity at 30 ppt). The relationships between gill Cu burden and % mortality were very similar at 2 and 30 ppt, in accord with the Biotic Ligand Model. In vivo experiments showed that copper concentration in the hemolymph is not dependent on metal concentration in the surrounding medium at either experimental salinity. They also showed that copper flux into the gills is higher than into other tissues analyzed, and that anterior and posterior gills are similarly important sites of copper accumulation at both experimental salinities. In vitro experiments with isolated-perfused gills showed that there is a positive relationship between copper accumulation in this tissue and the metal concentration in the incubation media for both anterior and posterior gills. A similar result was observed at both low and high salinities. Furthermore, in vitro experiments showed that copper accumulation in posterior gills is also positively and strongly dependent on the incubation time with copper. Gill copper accumulation occurred at a lower rate in the first 2h of metal exposure, increasing markedly after this "steady-state" period. This finding was corroborated by a significant increase in copper influx to the gill perfusate (corresponding to crab hemolymph) after this time, measured using (64)Cu. In vivo, after uptake from solution, (64)Cu was primarily accumulated in the gills and the rest of the body rather than in the hemolymph, hepatopancreas, or other internal tissues. Overall, the present findings indicate that gills are a key target organ for copper accumulation, as well as an important biological barrier against the excessive uptake of copper into the hemolymph and the subsequent distribution of this metal to internal organs of the blue crab.

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Distribution of particulate trace metal in the southern part of the Patos Lagoon estuary

Cited by 18 publications

References 10 publications

Using an integrated approach to assess the sediment quality of an estuary from the semi-arid coast of Brazil

Using an integrated approach to assess the sediment quality of an estuary from the semi-arid coast of Brazil

Heavy Metals Chelating Ability and Antioxidant Activity of Phragmites Australis Stems Extracts

Acute toxicity, accumulation and tissue distribution of copper in the blue crab Callinectes sapidus acclimated to different salinities: In vivo and in vitro studies

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