Salinity increases mobility of heavy metals in soils

Acosta, José A.; Jansen, Boris; Kalbitz, Karsten; Faz, Ángel; Martínez-Martínez, Silvia

doi:10.1016/j.chemosphere.2011.07.046

Cited by 386 publications

(155 citation statements)

References 32 publications

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“…Zn is toxic to cells due to the formation of reactive oxygen species (ROS) there by inhibiting some of the vital enzymes like endonucleases, DNA glucosylases, etc. Acosta et al (2011) and Zhao et al (2013) investigated that increase in ionic strength (salinity) increases the concentration of metal (Pb, Cu, Cd, Zn and Mn) released. High concentrations of MgCl 2 and NaCl led to an increased release of Zn from the sediments there by increasing its mobility and bioavailability.…”

Section: Mic Of Zn and Zno Npsmentioning

confidence: 99%

Resistance of extremely halophilic archaea to zinc and zinc oxide nanoparticles

2015

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Industrialization as well as other anthropogenic activities have resulted in addition of high loads of metal and/or metal nanoparticles to the environment. In this study, the effect of one of the widely used heavy metal, zinc (Zn) and zinc oxide nanoparticles (ZnO NPs) on extremely halophilic archaea was evaluated. One representative member from four genera namely Halococcus, Haloferax, Halorubrum and Haloarcula of the family Halobacteriaceae was taken as the model organism. All the haloarchaeal genera investigated were resistant to both ZnCl 2 and ZnO NPs at varying concentrations. Halococcus strain BK6 and Haloferax strain BBK2 showed the highest resistance in complex/minimal medium of up to 2.0/1.0 mM ZnCl 2 and 2.0/1.0-0.5 mM ZnO NP. Accumulation of ZnCl 2 /ZnO NPs was seen as Haloferax strain BBK2 (287.2/549.6 mg g -1 ) [ Halococcus strain BK6 (165.9/388.5 mg g -1 ) [ Haloarcula strain BS2 (93.2/28.5 mg g -1 ) [ Halorubrum strain BS17 (29.9/16.2 mg g -1 ). Scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM-EDX) analysis revealed that bulk ZnCl 2 was sorbed at a higher concentration (21.77 %) on the cell surface of Haloferax strain BBK2 as compared to the ZnO NPs (14.89 %).

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Section: Mic Of Zn and Zno Npsmentioning

confidence: 99%

Resistance of extremely halophilic archaea to zinc and zinc oxide nanoparticles

2015

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“…When adding high contents of NaCl in the pore fluid, the best recoveries were obtained in the order Pb [ Cu & Zn & Cr [ Cd. It was stated that an increase of salinity though addition of NaCl promoted a higher release of Pb than of Cu and Zn from soils (Acosta et al 2011). It was particularly obvious in our test for Pb, but in the case of Zn, its removal remained unchanged.…”

Section: Removal Of Metalsmentioning

confidence: 60%

Simultaneous electrokinetic removal of polycyclic aromatic hydrocarbons and metals from a sediment using mixed enhancing agents

Ammami

Benamar

Wang

et al. 2013

Int. J. Environ. Sci. Technol.

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The maintenance of harbor waterways generates large amounts of dredged sediments which are often rich in coexisting organic and inorganic contaminants. Electrokinetic remediation treatments have recently been developed for the simultaneous removal of heavy metals and polycyclic aromatic hydrocarbons (PAHs), using various enhancing agents generally tested sequentially. In this study, different processing fluids were tested, alone or mixed, to improve the decontamination of aged model sediment contaminated with cadmium, lead, chromium, copper, zinc, and five PAHs. Nitric acid (NA) and citric acid (CA) were tested to avoid the formation of an alkaline front into the sediment and favor the metals removal, while an anionic surfactant [sodium dodecyl sulfate (SDS)] and a nonionic surfactant (Tween 20) were tested to solubilize and mobilize PAHs. Processing fluids were circulated under a constant voltage gradient of 1 V cm -1 for 10-14 days. NA showed an excellent potential to remove metals (76.8-99.9 % removal) and PAHs (70.3-89.7 % removal) in a single run. Besides, the mixture of Tween 20 and CA, more environmental friendly, could be considered as a relatively good processing fluid for the simultaneous removal of metals (10.3-90.8 % removal) and PAHs (53.6-61.6 % removal) from the fine-grained sediment, while SDS mixed to CA was not a good candidate for this purpose (0.1-65 % removal for metals and 34.1-41.0 % removal for PAHs).

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“…When adding high contents of NaCl in the pore fluid, the best recoveries were obtained in the order Pb>Cu>Zn>Cr>Cd. It was already stated that an increase of salinity though addition of NaCl promoted a higher release of Pb than of Cu and Zn from soils (Acosta et al, 2011). The higher electrical current and sediment conductivity were responsible for a rapid migration of solubilized metals at the first stage of the treatment with NaCl, but metals were however rapidly stopped (24 to 48 h) by the formation of the alkaline front near the cathode.…”

Section: Resultsmentioning

confidence: 99%

Heavy metals removal from dredged sediments using electro kinetics

Ammami

Benamar

Koltalo

et al. 2013

E3S Web of Conferences

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Abstract. This study focuses on the use of a remediation process to remove particle-bound recalcitrant pollutants (heavy metals) from dredged harbor sediments which must be previously treated before reuse in civil engineering. Electrokinetic (EK) remediation is generally accepted as one of the most suitable technologies for extracting cationic heavy metals from fine grained sediments. Many batch tests were performed to better understand the capacity of various additives to improve sediment decontamination (when applying a constant voltage gradient of 1 V.cm-1), and the combination of enhancing agents (acids + surfactants) were assessed to obtain an efficient removal of heavy metals. We succeeded in proving that mixing citric acid and a nonionic surfactant (Tween 20), additives which are environmentally friendly, was a good association to enhance heavy metals (Cd, Cr, Cu, Pb and Zn) removal.

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Salinity increases mobility of heavy metals in soils

Cited by 386 publications

References 32 publications

Resistance of extremely halophilic archaea to zinc and zinc oxide nanoparticles

Resistance of extremely halophilic archaea to zinc and zinc oxide nanoparticles

Simultaneous electrokinetic removal of polycyclic aromatic hydrocarbons and metals from a sediment using mixed enhancing agents

Heavy metals removal from dredged sediments using electro kinetics

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