Adsorption of cadmium to iron and manganese oxides during estuarine mixing

Turner, Andrew; Roux, Sophie M. Le; Millward, G.E.

doi:10.1016/j.marchem.2007.10.004

Cited by 44 publications

(18 citation statements)

References 42 publications

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“…However, it is important to note that Cd has a low affinity for organic ligands, but a high affinity for the chloride ion. In addition, high salinity increases the presence of chlorocomplexes and therefore the reduction of the activity of free ions (Turner et al 2008). These facts and the high salinity (∼35‰) found in the studied water suggest that Cd is poorly reactive.…”

Section: Dissolved Metalsmentioning

confidence: 72%

Dissolved and particulate metals in water from Sonora Coast: a pristine zone of Gulf of California

García-Rico

Tejeda-Valenzuela

Jara-Marini

et al. 2010

Environ Monit Assess

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The purpose of this study was to investigate the distribution of metals (Cd, Pb, Hg, Cu, Fe, Mn, and Zn) in dissolved and particulate fractions in seawater from Bacochibampo Bay, Northern part of Mexico. Water samples were collected from November 2004 to October 2005. Metal analysis was done by graphite furnace atomic absorption spectroscopy. Results indicated highest concentrations of dissolved Cd and Zn in the sites localized at the mouth and center of the bay. During summer and spring, the highest levels of Cd, Mn, and Fe were detected, Zn in fall, and Pb and Cu in winter and spring. Mercury was the only metal that was not found in this fraction. In particulate fraction, Fe, Hg, and Mn were the most abundant elements in all the sampling sites, followed by Zn, Cu, Pb, and Cd. The highest levels of the majority of the metals were observed in the coastline, suggesting a continental and/or urban source for these chemicals. The highest level of Cd was detected during the summer and the rest of the metals in the fall. Statistically significant correlations were observed between dissolved and particulate forms of Pb:Mn, Cu:Fe, and Cu:Mn. The mean partition coefficient values were as follows: Fe>Mn>Cu>Pb>Cd>Zn. All dissolved metal concentrations found, except Pb, were lower than EPA-recommended water quality values. The levels of dissolved metals in this study reveal low bioavailability and toxic potential. However, further toxicological and sediment chemistry studies in this area are needed for a full risk assessment.

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Section: Dissolved Metalsmentioning

confidence: 72%

Dissolved and particulate metals in water from Sonora Coast: a pristine zone of Gulf of California

García-Rico

Tejeda-Valenzuela

Jara-Marini

et al. 2010

Environ Monit Assess

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“…Thus, Cd may exist in chlorocomplexes forms rather than free Cd 2+ in various sediment and water samples. Therefore, the adsorption on Fe-Mn oxides and coordination with organic matter are appreciably hindered due to the decreased availability of free Cd 2+ ions despite that these materials have a strong affinity for Cd 2+ (Turner et al, 2008). These low values of Cd at this fraction may also be explained in terms of the fact that Cd bound to acid volatile sulphides can be liberated rapidly as a result of aeration of sediments and elevated oxygen level can significantly increase the bioavailability of Cd in sediments (Zhuang et al, 1994;Schaanning et al, 1996).…”

Section: Fraction Bound To Organic Matters and Sulphidesmentioning

confidence: 99%

Monitoring the distribution of cadmium in sediment samples from Obajana stream in North central Nigeria

Okorie¹,

Olorunfemi²

2015

Int. J. Bio. Chem. Sci

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The distribution of cadmium species in sediments of different depths from Obajana stream was investigated by sequential extraction procedure and flame atomic absorption spectrometric detection. Index of geoaccumulation was used to assess the level of sediment pollution and it was found not to be polluted. However, the speciation results were found to contain Cd in the order exchangeable > organic matter/sulphide > residual > carbonate bound > Fe-Mn oxide at top soil and 5 cm depths. For 10 cm, 15 cm and 25 cm depths the observed trend in Cd concentration is Fe-Mn oxide bound > exchangeable > organic matter/sulphide > residual > carbonate bound. The order of decreasing concentration of Cd at 20 cm and 30 cm is Fe-Mn oxide > exchangeable > residual > organic matter/sulphide > carbonate bound. The Cd species in the exchangeable fraction occurs mostly at the topsoil followed by 5 cm and decreases progressively as the depth is increased. Thus plants and animals that may be exposed to this environment may, as a result of bioaccumulation, have concentrations of Cd in their systems beyond the acceptable limits prescribed by world health orgnisation.

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“…Mn(II) has a long residence time in waters owing to its slow oxidation kinetics (Davison 1993). In a laboratory-scale study freshly synthesized Mn oxide was shown to have a stronger affinity for Cd adsorption than Fe oxide and estuarine sediments (Turner et al 2008). Therefore, Mn oxides formed in waters can provide a carrier phase for Cd in estuarine waters (Wen et al 2008b), provided its abundance is high enough.…”

Section: Mn Distributionmentioning

confidence: 99%

“…Depending on the hydrochemical variability (i.e., redox condition and salinity), Cd can be present in estuarine waters as Cd sulfides (Jiann et al 2005), associated with colloidal material (Muller 1998;Wells et al 1998), adsorbed on particulate matter, especially on Mn oxides (Turner et al 2008;Wen et al 2008b), and as complexes with chloride (Stumm and Morgan 1995). Owing to the low DO (Fig.…”

Section: Phase Partitioning Controlsmentioning

confidence: 99%

“…Cd transport behavior in estuarine waters has been classified from mostly addition (Dai et al 1995;Wen et al 1999;Chiffoleau et al 2001;Martino et al 2002;Tang et al 2002;Garnier and Guieu 2003;Waeles et al 2005;Waeles et al 2008;), to varying extents of removal (Paucot and Wollast 1997;Zwolsman et al 1997;Jiann et al 2005;Chaudry and Zwolsman 2008;Wen et al 2011), resulting in modified Cd net fluxes out of estuaries into the ocean. The Cd removal features described above have been attributed to the formation of metal sulfides (Jiann et al 2005) and adsorption onto Fe-and Mn oxides in suspended matter and sediments (Turner et al 2008;Wen et al 2008b). Cd also forms chloro-complexes when high concentrations of chloride are present, as is the case in lower estuary and coastal regions.…”

Section: Introductionmentioning

confidence: 99%

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Cadmium Mixing Behavior in Estuaries: Redox Controls on Removal and Mobilization

Jiann¹,

Ho²

2014

Terr. Atmos. Ocean. Sci.

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This study investigates various hydrological and redox conditions controlling phase transformation, removal and remobilization of Cd in three different estuaries in Taiwan. It was found that Cd mixing patterns in estuarine waters are controlled mainly by redox conditions and salinity. In a highly urbanized estuary segment low oxygen conditions caused sulfide production and the formation of stable Cd sulfide minerals. In oxygen-replete waters [dissolved oxygen (DO) > 200 μM], high concentrations of Mn(II), likely from exchange with bottom sediments were oxidized into Mn oxides, on which Cd is adsorbed. However, in the lower estuary regions elevated chloride concentrations are likely able to compete for Cd, with large proportions of Cd becoming complexed with chloride. The stable Cd sulfide minerals, resistant to oxidation in estuaries having short flushing time, are likely settling out and depositing into bottom sediments. Reversible Cd adsorption onto Mn oxides can enhance Cd mobility in lower estuary and coastal regions where Cd chloro-complexes form, resulting in greater Cd transport fluxes into the ocean.

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Adsorption of cadmium to iron and manganese oxides during estuarine mixing

Cited by 44 publications

References 42 publications

Dissolved and particulate metals in water from Sonora Coast: a pristine zone of Gulf of California

Dissolved and particulate metals in water from Sonora Coast: a pristine zone of Gulf of California

Monitoring the distribution of cadmium in sediment samples from Obajana stream in North central Nigeria

Cadmium Mixing Behavior in Estuaries: Redox Controls on Removal and Mobilization

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