Arsenic uptake and depuration kinetics in Microcystis aeruginosa under different phosphate regimes

Wang, Zhenhong; Luo, Zhuanxi; Yan, Changzhou; Che, Feifei; Yan, Yao

doi:10.1016/j.jhazmat.2014.05.049

Cited by 47 publications

(13 citation statements)

References 35 publications

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“…Thirdly, the influence of dead cells of microalgae on the As metabolism cannot be overlooked because these cells may decompose or change their membrane permeability, releasing the absorbed As back to the culture media (Wang et al 2014c) and modifying intracellular As speciation (Duncan et al 2013a). Such impacts may be more significant in batch culture, in which the proportion of non-living cells keeps increasing since the nutrient supplies gradually become limited (Duncan et al 2013a).…”

Section: Concluding Remarks and Future Perspectivementioning

confidence: 99%

Review of arsenic speciation, toxicity and metabolism in microalgae

Wang

et al. 2015

Rev Environ Sci Biotechnol

165

100

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Arsenic is a toxic metalloid and its pollution has become a global environmental problem. This paper reviewed the current knowledge on the speciation, toxicity and metabolism of arsenic in microalgae. A number of arsenic species are present in various microalgae. Due to the great toxicity of inorganic arsenic, microalgae may undergo different processes to reduce the arsenic toxicity, including cell surface binding, arsenite [As(III)] oxidation, arsenate [As(V)] reduction, methylation, transformation into arsenosugars or arsenolipids, chelation of As(III) with glutathione and phytochelatins, as well as excretion from cells. Several genes and enzymes involved in arsenic transformations have been identified and characterized. Many factors, especially nutrient elements (e.g., nitrogen and phosphorus) in cells and in culture, affect arsenic metabolic pathways of microalgae. Arsenic metabolism in the unicellular algae has gained considerable interest because these processes control not only the effectiveness of arsenic phycoremediation, but also the risk of arsenic contamination in algal products. Future research need to focus on (1) the regulative mechanisms of arsenic absorption, biotransformation and excretion at molecular level; (2) the effects of intracellular nutrient dynamics on arsenic speciation; (3) the impacts of culture regime on the arsenic metabolism in microalgae; (4) the transfer of arsenic species across aquatic food web in order to better evaluate the roles of microalgae in arsenic cycling.

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Section: Concluding Remarks and Future Perspectivementioning

confidence: 99%

Review of arsenic speciation, toxicity and metabolism in microalgae

Wang

et al. 2015

Rev Environ Sci Biotechnol

165

100

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“…A nonlinear one-compartment model considering a simultaneous As uptake and release was used to describe the measured intracellular concentration of As in algal cells for each treatment over time according to the following first-order kinetics:

Herein,

(μg g −1 dry weight) is the intracellular concentration of As in algal cells;

(μg L −1 ) is the As concentration in medium assumed to be a constant, and t (h) is the time of As exposure; k u (L g −1 h −1 ) and k e (h −1 ) are the As uptake and release rate constants for the algae, respectively [ 5 ].…”

Section: Methods Detailsmentioning

confidence: 99%

“…To determine the As release rates from dead cells, 50 mL algal solution of each treatment were taken after 96 h incubation and rinsed with ultrapure water and the aforementioned phosphate buffer. To produce dead cells of M. aeruginosa , the samples were heated for 10 min at 50 °C using a waterbath [ 5 , 7 , 8 ]. Afterwards the treated algae were resuspended in 20 mL sterilized BG-11 media (same with their initial culture conditions) for 8 h, respectively.…”

Section: Methods Detailsmentioning

confidence: 99%

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Methods of determing biokinetics of arsenate accumulation and release in Microcystis aeruginosa regulated by common environmental factors: Practical implications for enhanced bioremediation

et al. 2018

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“…A systematic examination of hydrodynamic size and sedimentation of nTiO 2 in three types of media was conducted. Additionally, arsenic, ubiquitous throughout global environments, is a noxious, nonessential metalloid that has been designated a priority pollutant [26]. Increasing concern has recently arose on how and to what extent changes in nTiO 2 cause co-occurring contaminants, such as arsenic, to react across phytoplankton-daphnia food chains [27].…”

Section: Introductionmentioning

confidence: 99%

Dispersion and sedimentation of titanium dioxide nanoparticles in freshwater algae and daphnia aquatic culture media in the presence of arsenate

Wang

Luo

Yan

2018

Journal of Experimental Nanoscience

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Little information is available on Titanium dioxide nanoparticles (nTiO 2 ) behavior in different culture media for aquatic organisms. This study aimed to accurately evaluate nTiO 2 dispersion and sedimentation in common freshwater algae (BG-11) and daphnia aquatic (SM7) culture media. We additionally investigated potential mechanisms of nTiO 2 stability under arsenate influence. Results showed that high ionic strength in culture media was probably a key reason for the acute nTiO 2 agglomeration found. Additionally, the hydrodynamic size of nTiO 2 suspension in the presence of arsenate was significantly larger, increasing with arsenate concentration in ultrapure water. Conversely, the hydrodynamic size in BG-11 and SM7 decreased with arsenate concentration. The nTiO 2 sedimentation rate increased significantly with arsenate concentration in ultrapure water but significantly decreased in BG-11 and SM7 culture media. Many nTiO 2 remained suspended after initial rapid sedimentation and the slight sedimentation that occurred in the subsequent 24 h, suggesting that algae and daphnia within the water column will be exposed to small nanoparticle aggregates for a long period of time. Such nTiO 2 behavior, especially in the presence of arsenate, requires more consideration than the different toxicological results reported in literature.

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Arsenic uptake and depuration kinetics in Microcystis aeruginosa under different phosphate regimes

Cited by 47 publications

References 35 publications

Review of arsenic speciation, toxicity and metabolism in microalgae

Review of arsenic speciation, toxicity and metabolism in microalgae

Methods of determing biokinetics of arsenate accumulation and release in Microcystis aeruginosa regulated by common environmental factors: Practical implications for enhanced bioremediation

Dispersion and sedimentation of titanium dioxide nanoparticles in freshwater algae and daphnia aquatic culture media in the presence of arsenate

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