Trace metals distribution from a serpentinite weathering at the scales of the weathering profile and its related weathering microsystems and clay minerals

Caillaud, Jacinthe; Proust, D.; Philippe, Sylvie; Fontaine, Claude; Fialin, Michel

doi:10.1016/j.geoderma.2008.11.031

Cited by 72 publications

(45 citation statements)

References 29 publications

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“…Amorphous Fe oxides have a high specific surface area and can act as important sorbents of trace metals (24). Our results are in line with previously described weathering sequences of serpentine minerals (25). Since strain SBA82 is a siderophore producer, its mechanism of weathering probably involves siderophore-induced mineral dissolution.…”

Section: Discussionsupporting

confidence: 90%

Bacterially Induced Weathering of Ultramafic Rock and Its Implications for Phytoextraction

Becerra-Castro

Kidd

Kuffner

et al. 2013

Appl Environ Microbiol

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The bioavailability of metals in soil is often cited as a limiting factor of phytoextraction (or phytomining). Bacterial metabolites, such as organic acids, siderophores, or biosurfactants, have been shown to mobilize metals, and their use to improve metal extraction has been proposed. In this study, the weathering capacities of, and Ni mobilization by, bacterial strains were evaluated. Minimal medium containing ground ultramafic rock was inoculated with either of two Arthrobacter strains: LA44 (indole acetic acid [IAA] producer) or SBA82 (siderophore producer, PO 4 solubilizer, and IAA producer). Trace elements and organic compounds were determined in aliquots taken at different time intervals after inoculation. Trace metal fractionation was carried out on the remaining rock at the end of the experiment. The results suggest that the strains act upon different mineral phases. LA44 is a more efficient Ni mobilizer, apparently solubilizing Ni associated with Mn oxides, and this appeared to be related to oxalate production. SBA82 also leads to release of Ni and Mn, albeit to a much lower extent. In this case, the concurrent mobilization of Fe and Si indicates preferential weathering of Fe oxides and serpentine minerals, possibly related to the siderophore production capacity of the strain. The same bacterial strains were tested in a soil-plant system: the Ni hyperaccumulator Alyssum serpyllifolium subsp. malacitanum was grown in ultramafic soil in a rhizobox system and inoculated with each bacterial strain. At harvest, biomass production and shoot Ni concentrations were higher in plants from inoculated pots than from noninoculated pots. Ni yield was significantly enhanced in plants inoculated with LA44. These results suggest that Ni-mobilizing inoculants could be useful for improving Ni uptake by hyperaccumulator plants.

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Section: Discussionsupporting

confidence: 90%

Bacterially Induced Weathering of Ultramafic Rock and Its Implications for Phytoextraction

Becerra-Castro

Kidd

Kuffner

et al. 2013

Appl Environ Microbiol

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“…As may be seen, the three heavy metals have similar positive trends toward the seventh fraction which implies their close association with the residual part. Previous research shows that even though the heavy metals attached to this part are not expected to be immediately reactive in the environment, changing the chemical conditions of the soils might affect their availability, thereby releasing them into the soil system (Caillaud et al, 2009). Among non-residual fractions, significant proportions of the elements were held in the crystalline Fe-oxide and Mnoxide and smaller ones were present in the poor crystalline Fe-oxide.…”

Section: Discussionmentioning

confidence: 99%

Assessment of selected sequential extraction and the toxicity characteristic leaching test as indices of metal mobility in serpentinite soils

Tashakor

Yaacob

Mohamad

et al. 2014

Chemical Speciation & Bioavailability

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Serpentinite soils are characterised by high concentrations of chromium, nickel, and cobalt. The accumulation of heavy metals as non-degradable inorganic contaminants is of great concern. Under normal circumstances the form in which a metal exists governs its transport in the environment and thus, its hazards. In this study, a specific developed speciation analysis for tropical soils was applied to determine the mobility of Cr, Ni and Co in two serpentinitic soil outcrops in Malaysia. The combination of selective sequential extraction analysis (SEE) and X-ray diffraction of soil powders showed that Cr and Ni are primarily associated with the residual fraction of soil which is inherited from resistant silicates. The crystalline Fe-oxide fraction of soil is the second substanial scavenger of Cr and Ni, whilst the dynamics of Co are mostly controlled by Mn-oxide and the poor crystalline Fe-oxide. The more easily mobilised forms of the studied metals carried on soluble-exchangeable, surface adsorbed and organic matter fractions are of minimal compartments. Therefore these metals are basically not available in the environment. On the other hand, corroborating information on the mobility of the metals was gained by applying the toxicity characteristic leaching procedure test (TCLP). The consistent results of the TCLP with the SSE revealed the non-toxic effects of Cr, Ni and Co in the environment despite their overload accumulation in the analysed serpentinite soils.

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“…Finally, the independent mineral phases of nickel and nickel-magnesium hydrous silicates occur at a PH of about 6-7 (Komov et al, 1994). The most complete profiles are usually present over the weathered serpentinites, on top of the less altered pyroxenites, in the limonitic zone (Caillaud et al, 2009). Skrzypek and his colleagues (2004) stated that the chrysoprase samples analysed from Poland, Kazakhstan, and Australia were formed in veins, and they were apparently associated with somewhat younger vein magnesite.…”

Section: Geological Background Of the Biga-çanakkale Regionmentioning

confidence: 99%

Optical and Cathodoluminescence Investigations of the Green Microcrystalline (Chrysoprase) Quartz

Hatipoğlu¹,

Yardımcı²

2014

JLA

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Gem-quality green cryptocrystalline silica formation is relatively rare in nature, and has an interesting mineralogical crystallization and irradiation response of the fine fibrous silica. Chemical analyses of the green material reveal remarkable concentrations of some trace elements, such as nickel, iron, and chrome. They are certainly responsible for producing of the individual color production and irradiation luminescence response. Optical absorption spectroscopy shows that the dark green coloration is due to light transmittance at 528 nm in the visible region as a result of absorbance peak at 645 nm and about 360-410 nm absorbance band gap. These optical absorbance gaps are due to not only Ni ion content (4600 ppm) but also, Fe ion (13600 ppm) and Cr ion (823 ppm) contents. The cathodoluminescence spectra of the green material were taken into consideration in this study, and they were evaluated using "surpher, grapher, and axum" of the computer programs. In the spectra of alternative current cathodoluminescence with two-dimension, one major spectral emission band appears at readable intensity and magnitude in 90 Hz in the yellow wavelength region at 585 nm. In addition, the two-dimension cathodoluminescence spectra show that only the other major spectral emission band of cathodoluminescence appears at 90 Hz frequency in the green wavelength region at 530 nm.

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Trace metals distribution from a serpentinite weathering at the scales of the weathering profile and its related weathering microsystems and clay minerals

Cited by 72 publications

References 29 publications

Bacterially Induced Weathering of Ultramafic Rock and Its Implications for Phytoextraction

Bacterially Induced Weathering of Ultramafic Rock and Its Implications for Phytoextraction

Assessment of selected sequential extraction and the toxicity characteristic leaching test as indices of metal mobility in serpentinite soils

Optical and Cathodoluminescence Investigations of the Green Microcrystalline (Chrysoprase) Quartz

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