Biosorption of metals (Cd, Cu and Zn) by the freshwater diatom<i>Planothidium lanceolatum</i>: a laboratory study

Sbihi, K.; Cherifi, Ouafa; Bertrand, Martine; Gharmali, Abdelhay El

doi:10.1080/0269249x.2013.872193

Cited by 27 publications

(17 citation statements)

References 43 publications

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“…suggested that copper bioavailability may be reduced by changes in speciation at warmer temperatures. Here, intracellular accumulation was not enhanced by temperature [see24 for details], as also found by Sbihi et al[42] using higher exposure concentrations. Indeed, they observed no increase in Cu biosorption by P. lanceolatum (one of the The mechanism of species selection over time by temperature and/or toxicant exposure more likely explains the patterns observed in the PICT response: under chronic Cu exposure, we found the highest tolerance in Cu-8 communities where the number of species and Shannon diversity were at their highest values, supporting the hypothesis that stress tolerance is underpinned by Author-produced version of the article published in Journal of HazardousMaterials, vol.…”

supporting

confidence: 79%

Changes in copper toxicity towards diatom communities with experimental warming

Morin

Lambert²,

Rodriguez

et al. 2017

Journal of Hazardous Materials

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Biological communities in aquatic environments most commonly face multiple stress, where natural and anthropogenic stressors often act jointly. Their interactions are most easily assessed using short cycle organisms such as periphytic diatoms. In this experiment, we analyzed the combined effects of copper exposure and warming on diatom successions over 6 weeks. Natural biofilm collected in winter was left to grow in mesocosms exposed or unexposed to realistic Cu concentrations at four different temperatures. Separate and joint impacts of the two stressors were determined through structural and functional endpoints. Both temperature and copper influenced the biological responses; their interaction, when significant, was always antagonistic. Diatom communities gradually changed with rising temperature. Under copper exposure, the dominant Planothidium lanceolatum was superseded by Achnanthidium exiguum, which accounted for about 70% relative abundance in the warmest conditions (18-23°C). Tolerance to copper was derived from dose-response curves based on photosynthesis inhibition. Cu-induced community tolerance was always found, but it decreased with warming and time. Biodiversity loss associated with lower Cu tolerance under combined Cu exposure and increasing temperatures evidences the major influence of cumulative stressors on aquatic health. These results highlight the crucial interplay between environmental stressors, which are expected to intensify with climate change.

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supporting

confidence: 79%

Changes in copper toxicity towards diatom communities with experimental warming

Morin

Lambert²,

Rodriguez

et al. 2017

Journal of Hazardous Materials

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“…The maximum Cd, Cu and Zn biosorption capacity was found to be 42, 90 and 127 mg per 16 10 8 diatom cells L -1 , occurring within 30 min of contact, at 25°C, an initial metal concentration of 8mg L -1 and an optimum pH of 6.0 for Cu, and 8.0 for Zn and Cd. These results are similar to those obtained with P. lanceolathum, another diatom dominant in the Tensift River who has the ability to remove also the hexavalent chromium Cr(VI) [10,11]. Therefore, the widely available biomasses of N. subminuscula and P. lanceolathumin the Tensift River indeed have the potential to be used as an effective and economic materials for the removal of heavy metals from wastewater streams and tannery effluents, as found for other freshwater diatoms in different environments [36,37,19,38].…”

Section: Resultssupporting

confidence: 80%

“…Industrial wastewater and mining wastes flow directly into the environment without any treatment. In Morocco, there are only few studies on freshwater diatom ability to remove metals from the environment [9,10,11]. For these reasons, studies directed to this field are necessary.…”

Section: Introductionmentioning

confidence: 99%

The removal of metals (Cd, Cu and Zn) from the Tensift river using the diatom Navicula subminuscula Manguin: A laboratory study

Cherifi¹,

Sbihi²,

Bertrand³

et al. 2016

Int. J. Adv. Res. Biol. Sci.

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Various biomaterials have shown promise as sorbents to remove heavy metals from polluted waters at lower cost than conventional wastewater treatment technologies. The aim of this study is to characterize the ability of the freshwater diatom Navicula subminuscula Manguin to biosorb cadmium, copper and zinc from aqueous solutions. Our results indicate that the biosorption of metals by N. subminuscula increased as the initial concentration of metal ions increased in the medium until a concentration of 100-130 mg L -1 . Biosorption equilibrium was established in 30 minutes. The maximum metal ions biosorbed was found to be 42, 90 and 127 for 16 10 8 diatoms per liter for Cd, Cu and Zn, respectively. The maximum uptake of metals was obtained at pH 6.0 for Cu and at pH 8.0 for Cd and Zn. An increase in the biosorption of P. lanceolatum was observed with an increase in temperature from 15 to 25°C. The biosorption of all three metal ions followed the Langmuir isotherm. Competitive biosorption of cadmium, copper and zinc ions was also achieved. The FTIR (Fourier Transformed Infra Red spectroscopy) results of algal biomass revealed the different functional groups at the diatom surface that are able to react with metals in the medium. The results all together suggest that N. subminusculacan be used as a biosorbent for an efficient removal of heavy metals from aqueous solutions which temperature and pH values could be close to the mean ones of the Tensiftriver.

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“…In the other process, arsenic was bioadsorbed when microalgal biomass accumulated. Of these two processes, fast adsorption is employed by metal ions that adhere to microalgal cell surfaces, whereas bioadsorption is the process by which ions accumulate inside microalgal cells and participate in metabolic processes(Sbihi et al, 2013).Microalgal cell walls serve as barriers between microalgal cells and the external environment.They function as the first line of defence against ion toxicity in microalgal cells. High metal ion adsorbability is related to the physical structures of microalgal cells and negatively charged sites on the cell walls.…”

mentioning

confidence: 99%