Determination of heavy metals in environmental bio-indicators by voltammetric and spectroscopic techniques

Locatelli, Clinio; Torsi, G.; Garai, Tibor

doi:10.1007/s002160051268

Cited by 12 publications

(9 citation statements)

References 1 publication

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“…On the contrary, in the case of the Goro Bay ecosystem, it is important to highlight that the data reported in this work are in general agreement with the metal concentration data obtained in the same matrices in previous surveys [62,63]. Table 7.…”

supporting

confidence: 90%

Sequential voltammetric determination of mercury(II) and toxic metals in environmental bio-monitors: application to mussels and clams

Locatelli

Melucci

2009

International Journal of Environmental Analytical Chemistry

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supporting

confidence: 90%

Sequential voltammetric determination of mercury(II) and toxic metals in environmental bio-monitors: application to mussels and clams

Locatelli

Melucci

2009

International Journal of Environmental Analytical Chemistry

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“…It was indicated that the electron-dense aggregates could be generated in red alga and cyanobacterium cultured with high levels of heavy metals (Nagasaka et al 2004;Swingley et al 2005). Considering the fact that sequestration and concentration of heavy metals was one of the diverse mechanisms used by living organisms e.g., algae, mussels and shrimps (Locatelli et al 1999), we hypothesized that this phenomenon might also be present in S. quadricauda to resist TPT toxicity. Nevertheless, further probe into the nature of these aggregates is necessary for clarification.…”

Section: Tpt Induced Oxidative Stress and Antioxidative Responses In mentioning

confidence: 97%

Triphenyltin induced growth inhibition and antioxidative responses in the green microalga Scenedesmus quadricauda

Mak

et al. 2010

Ecotoxicology

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The toxicity of organotin compounds in the environment is closely related to their uptake by microorganisms and delivery through the food chain. The population at low trophic levels like microalgae plays an important role in this aspect. In this study, the toxic effects of triphenyltin (TPT) on Scenedesmus quadricauda were assessed at the population, cellular and subcellular levels. The alga was exposed to TPT of up to 64 μg l(-1) (nearly lethal concentration), but the algal growth was inhibited significantly when TPT was elevated to 8 μg l(-1). This growth inhibition was correlated to the presence of oxidative stress as evidenced by the accumulation of malondialdehyde (MDA) and confirmed by fluorescent probing of the intracellular reactive oxygen species (ROS) levels. The imbalanced activities of superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPx) may lead to an accumulation of intracellular H(2)O(2), which can initiate an oxidative damage to cell components and cause growth inhibition and finally cell death. The detachment of plasma membrane from cell wall, the structural change of chloroplasts as well as the increased number and size of starch granules together with electron-dense deposits in chloroplasts were noticed through electron microscopic examination. It was suggested that mitochondria, chloroplasts and protoplasm might be the direct targets of TPT toxicity. This study confirmed that TPT poisoning on phytoplankton can happen at very low concentrations. There existed different defense mechanisms e.g., antioxidant enzyme activation, starch accumulation and possibly metal sequestration in algal species as the means to resist TPT toxicity.

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“…One of the major problems in ecology is the path of heavy metals in aquatic environment. They may enter the food chain and accumulate in marine plants to endanger organisms like mussels, clams or shrimp, which concentrate them [11,16]. Stozhko et al in their review paper [17] provided a detailed list of references regarding modified GC electrodes used in stripping voltammetry for determination of metals.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Determination of Pb and Cd Traces in Water Samples by Anodic Stripping Voltammetry Using a Modified GC Electrode

et al. 2011

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The determination of Pb and Cd with a Nafion-modified glassy carbon electrode and Cu-DPABA complex (Cu-DPABA-NA/GCE; DPABA is methyl 3,5-bis{bis-[(pyridin-2-yl)methyl]amino}methyl-benzoate) as an alternative electrode for anodic stripping voltammetry was described. Pb and Cd were accumulated in acetate buffer pH 4 at a potential of À1.4 V (vs. Ag/AgCl electrode) for 120 s followed by a DPASV scan from À1.2 to À0.2 V. Under optimum conditions the calibration curves were linear in the range of 4.8 10 À9 -5.0 10 À5 and 5.0 10for Pb and Cd, respectively. Detection limits were 1.8 10 À9 and 1.2 10 À9 mol L À1 for Pb and Cd, respectively. Different parameters and conditions, such as membrane ingredients, accumulation time, potential and pH value were optimized. A study of interfering substances was also performed. A significant increase in current was achieved at the modified electrode in comparison with the bare glassy carbon electrode. The validation of the proposed method was made by Pb and Cd determination in the certified reference material Groundwater CRM 610 (BCR, Community Bureau of Reference, Brussels, Belgium). The electrode was successfully applied for determination of Pb and Cd in river water with a high content of organic contaminants without any pretreatment.

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Determination of heavy metals in environmental bio-indicators by voltammetric and spectroscopic techniques

Cited by 12 publications

References 1 publication

Sequential voltammetric determination of mercury(II) and toxic metals in environmental bio-monitors: application to mussels and clams

Sequential voltammetric determination of mercury(II) and toxic metals in environmental bio-monitors: application to mussels and clams

Triphenyltin induced growth inhibition and antioxidative responses in the green microalga Scenedesmus quadricauda

Simultaneous Determination of Pb and Cd Traces in Water Samples by Anodic Stripping Voltammetry Using a Modified GC Electrode

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