Geochemical factors affecting the solubility of copper in seawater

Angel, Brad M.; Apte, Simon C.; Batley, Graeme E.; Raven, Mark

doi:10.1071/en20133

Cited by 6 publications

(2 citation statements)

References 34 publications

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“…These differences among the nominal concentrations and the measured concentrations have been explained in the literature. The precipitation of amorphous Cu hydroxy compounds of chloride, carbonate, and sulphate has been described as the reason for the decrease in the measured concentrations in the Cu toxicity test in seawater [ 64 ]. The effect of microscale aggregates in the Cu-NP test contributed to this decrease [ 60 ].…”

Section: Resultsmentioning

confidence: 99%

Induction of Oxidative Stress by Waterborne Copper and Arsenic in Larvae of European Seabass (Dicentrarchus labrax L.): A Comparison with Their Effects as Nanoparticles

Torronteras,

Díaz-de-Alba,

Granado-Castro

et al. 2024

Toxics

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The aim of this work was to compare the potential induction of oxidative stress and the antioxidant enzymatic response after a short-term waterborne exposure to copper (Cu) and arsenic (As) with that of the nanoparticles (NPs) of these elements (Cu-NPs and As-NPs) in fish larvae of the species Dicentrarchus labrax. Larvae were grouped in several tanks and exposed to different concentrations of contaminants (0 to 10 mg/L) for 24 or 96 h under laboratory conditions. Copper and arsenic concentrations were analysed in larval tissues using ICP-MS. A set of oxidative stress biomarkers, including the levels of hydroperoxides (HPs), and superoxide dismutase (SOD) and catalase (CAT) activities were assessed. The trace element concentrations (mg/kg d.w.) in larvae ranged as follows: 3.28–6.67 (Cu at 24 h) and 2.76–3.42 (Cu at 96 h); 3.03–8.31 (Cu-NPs at 24 h) and 2.50–4.86 (Cu-NPs at 96 h); 1.92–3.45 (As at 24 h) and 2.22–4.71 (As at 96 h); and 2.19–8.56 (As-NPs at 24 h) and 1.75–9.90 (As-NPs at 96 h). In Cu tests, the oxidative damage (ROOH levels) was induced from 0.1 mg/L at both exposure times, while for Cu-NPs, this damage was not observed until 1 mg/L, which was paralleled by concomitant increases in SOD activity. The CAT activity was also increased but at lower metal concentrations (0.01 mg/L and 0.1 mg/L for both chemical forms). No oxidative damage was observed for As or As-NPs after 24 h, but it was observed for As after 96 h of treatment with 0.01 mg/L. A decrease in SOD activity was observed for As after 24 h, but it turned out to be increased after 96 h. However, As-NPs did not alter SOD activity. The CAT activity was stimulated only at 96 h by As and at 24 h by As-NPs. Therefore, the two chemical forms of Cu exhibited a higher bioaccumulation and toxicity potential as compared to those of As. Importantly, the association of both Cu and As in NPs reduced the respective trace metal bioaccumulation, resulting also in a reduction in the toxic effects (mortality and biochemical). Furthermore, the assessment of oxidative stress-related biomarkers in seabass larvae appears to be a useful tool for biomonitoring environmental-occurring trace elements.

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Section: Resultsmentioning

confidence: 99%

Induction of Oxidative Stress by Waterborne Copper and Arsenic in Larvae of European Seabass (Dicentrarchus labrax L.): A Comparison with Their Effects as Nanoparticles

Torronteras,

Díaz-de-Alba,

Granado-Castro

et al. 2024

Toxics

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“…Hg, Pb, Cd). The biological availability of trace metals entering seawater via atmospheric deposition is regulated by their chemical speciation, interactions (with organic matter, interfaces, biota), 6 chemical transformations, solubility, 2,7,8 leaching 9 and uptake kinetics. 10 Atmospheric deposition is one of the most important sources of water-soluble organic carbon in seawater, 11,12 which serves as a carbon source for heterotrophic bacteria and thus plays a role in the biogeochemical carbon cycle.…”

Section: Introductionmentioning

confidence: 99%