The relative affinities of Cd, Ni and Zn for different soil clay fractions and goethite

Tiller, K. G.; Gerth, Joachim; Brümmer, Gerhard W.

doi:10.1016/0016-7061(84)90003-x

Cited by 152 publications

(72 citation statements)

References 11 publications

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“…However, both minerals do not readily sorb Ni, especially in the presence of SO42-, reflecting their relative softness in an absolute sense. In contrast, kaolinite shows greater relative affinity for Ni than montmorillonite and soil clay fractions rich in 2:1 phyllosilicates display greater preference for Zn than for Cd and Ni, and higher affinities for each metal at pH < 5 than clays rich in Fe (Tiller et al,, 1984b).…”

Section: Introductionmentioning

confidence: 84%

Removal of Nickel and Cobalt from Aqueous Solutions by Na-Activated Bentonite

Triantafyllou

1999

Clays and clay miner.

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Abstract--The ability of Na-activated bentonite to remove Ni 2+ and Co 2+ from aqueous solutions at room temperature (22 _+ I~ was studied under various experimental conditions. The parameters studied were solid-to-liquid ratios and initial cation concentrations. Experiments involved the behavior of bentonite vs. Ni and Co separately and where Ni and Co were present in solution at different concentrations and ratios. Bentonite retained substantial amounts of both metals readily, but it showed a higher affinity for Ni.Over-exchange appears when initial metal concentration exceeds the concentration corresponding to the cation exchange capacity (CEC) of bentonite. The presence of both metals in solution may be either synergistic or antagonistic sorption, depending on the initial ion concentrations.

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Section: Introductionmentioning

confidence: 84%

Removal of Nickel and Cobalt from Aqueous Solutions by Na-Activated Bentonite

Triantafyllou

1999

Clays and clay miner.

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“…Consequently, the rates of soil organic matter decomposition are delayed (McBride et al, 1997;Dijkstra, 1998). Also, acidity inputs can lead to mineral dissolution and leaching of some heavy metals (Tyler et al, 1984), such that, it is often difficult to establish whether an impact is due to acidification processes or to anthropogenic deposition of heavy metals.…”

Section: Introductionmentioning

confidence: 99%

Heavy metal distribution in some French forest soils: evidence for atmospheric contamination

Hernandez

Probst

et al. 2003

Science of The Total Environment

467

246

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This study is one of very few dealing with the distribution and the origin of heavy metals in French soils from a priori non-polluted forest areas. The abundance of heavy metals measured in these soils decreases as follows: Cr) Zn)Pb)Ni)Cu)Co4Cd. Total concentrations of Pb, Cr and Ni in some soils exceed the European thresholds for non-polluted soils and even the French association of normalization critical values for sludge spreading. The lowest heavy metal contents are observed in acid soils while the highest concentrations are in the calcaric cambisol and in the mollic andosol, which is rather scarce as compared with the other French forest soils. With the exception of the podzol, Cr and Ni concentrations increase with depth in all soil profiles. The distribution pattern of Co, Cu, Zn depends on the soil characteristics. In some acid soils, however, Cu and Zn decrease with depth. Pb and Cd are accumulated in the upper soil horizons. Heavy metals accumulate in deep soil horizons in relation to important clay content in the dystric planosol and stagnic luvisol. The concentration of each heavy metal is always controlled by different parameters (soil pH, iron and aluminum oxide content, clay content, organic matter and cation exchange capacity), which are heavy metal specific. This study highlights the metal-trapping character of andosol and calcaric soil, the weak heavy metal retention in acid soils, the leaching and trapping character in leached clayed soils, and the migration of heavy metals in the podzol. Pb and Cr concentrations indicate a significant enrichment in surface horizons from various soils in areas which receive significant acid atmospheric pollution. Particularly, the highest Pb content is observed in a soil located in the N-NE part of France. Lead isotope ratios measured in the cambic podzol and the calcaric cambisol, exhibit the importance of the anthropogenic sources and particularly the influence of global atmospheric inputs from leaded gasoline compared to regional and local industrial emissions. The anthropogenic Pb contribution is estimated to 83, 30 and 11%, respectively, for surface, intermediate and deep horizons of the cambic podzol located in the northern part of France, and to 68% in surface horizon of the calcaric cambisol located in the Alps.

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“…High pHs generally result in greater specific adsorption of Zn (Farrah and Picketing 1976). The mechanism of the specific adsorption at high pH is believed to be associated with the formation of Zn(OH) § (Farrah and Pickering 1976;Tiller et al 1984). Although Zn has a high degree of hydration (Pass 1973), in solution the Zn will increasingly form Zn(OH) + with increasing pH.…”

Section: Introductionmentioning

confidence: 99%

Dehydration, Diffusion and Entrapment of Zinc in Bentonite

Uren

1998

Clays and clay miner.

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Abstract--Interactions with bentonite are important in the chemical speciation and fate of heavy metals in soils and other ecosystems. The interactions of Zn with bentonite were studied using X-ray diffraction (XRD), dehydration, kinetic and sequential extraction procedures. The species and activity of Zn retained by bentonite were affected markedly by pH. The Zn(OH) + was retained by bentonite prepared at pH --> 6.9. The extent of dehydration of Zn(OH)+-bentonite was higher than that for Zn-bentonite. At a relative humidity of 55.5%, the basal spacing of the Zn(OH)*-bentonite was from 1.21 to 1.26 nm with 1 water sheet and that of the Zn-bentonite was 1.51 nm with 2 water sheets. The greater affinity of Zn(OH) + for bentonite than Zn was associated with a lower degree of hydration. When an aqueous suspension of Cabentonite was incubated with soluble Zn, the concentration of Zn retained by the Ca-bentonite was linearly related to the square root of time. The rate of the interaction was controlled probably by the interlayer diffusion and subsequently by the diffusion into the ditrigonal cavities in bentonite. The Zn retained by bentonite was dehydrated in situ so as to increase the bonding of Zn with surfaces of bentonite. With hydrothermal treatment the retained Zn could diffuse easily into the cavities and transform increasingly to the residual forms that are associated with the entrapped form.

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The relative affinities of Cd, Ni and Zn for different soil clay fractions and goethite

Cited by 152 publications

References 11 publications

Removal of Nickel and Cobalt from Aqueous Solutions by Na-Activated Bentonite

Removal of Nickel and Cobalt from Aqueous Solutions by Na-Activated Bentonite

Heavy metal distribution in some French forest soils: evidence for atmospheric contamination

Dehydration, Diffusion and Entrapment of Zinc in Bentonite

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