Application of Synchrotron X-ray Fluorescence Spectroscopy and Energy Dispersive X-ray Analysis To Identify Contaminant Metals on Groundwater Colloids

Kaplan, Daniel I.; Hunter, D. B.; Bertsch, Paul M.; Bajt, Saša; Adriano, D. C.

doi:10.1021/es00055a033

Cited by 40 publications

(33 citation statements)

References 4 publications

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“…The past decade has witnessed great interest in the generation and transport of mineral colloidal phases through natural porous media (33,34,40,(42)(43)(44)(45)(46)(47). Interest in this subject has paralleled evidence that colloidal minerals are important vectors for facilitating the transport of contaminants in certain environments (43,(47)(48)(49)(50).…”

Section: Mixed Mineral Assemblages In Natural Systemsmentioning

confidence: 99%

“…Over the past decade, our investigations have focused on providing evidence for the facilitated transport of contaminants associated with mobile colloidal phases and in defining the mechanisms leading to the generation and transport of mobile colloidal phases and solutes (33,34,40,46,49,(51)(52)(53). These studies have examined surface chemical controls on colloid generation and of colloid and solute migration in surface and subsurface highly weathered oxide-rich systems having similar bulk clay mineralogy.…”

Section: Mineralogy and Surface Chemistry Of Complex Mineral Assemblamentioning

confidence: 99%

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Characterization of complex mineral assemblages: Implications for contaminant transport and environmental remediation

Bertsch

Seaman

1999

Proc. Natl. Acad. Sci. U.S.A.

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115

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Surface reactive phases of soils and aquifers, comprised of phyllosilicate and metal oxohydroxide minerals along with humic substances, play a critical role in the regulation of contaminant fate and transport. Much of our knowledge concerning contaminant-mineral interactions at the molecular level, however, is derived from extensive experimentation on model mineral systems. Although these investigations have provided a foundation for understanding reactive surface functional groups on individual mineral phases, the information cannot be readily extrapolated to complex mineral assemblages in natural systems. Recent studies have elucidated the role of less abundant mineral and organic substrates as important surface chemical modifiers and have demonstrated complex coupling of reactivity between permanent-charge phyllosilicates and variable-charge Fe-oxohydroxide phases. Surface chemical modifiers were observed to control colloid generation and transport processes in surface and subsurface environments as well as the transport of solutes and ionic tracers. The surface charging mechanisms operative in the complex mineral assemblages cannot be predicted based on bulk mineralogy or by considering surface reactivity of less abundant mineral phases based on results from model systems. The fragile nature of mineral assemblages isolated from natural systems requires novel techniques and experimental approaches for investigating their surface chemistry and reactivity free of artifacts. A complete understanding of the surface chemistry of complex mineral assemblages is prerequisite to accurately assessing environmental and human health risks of contaminants or in designing environmentally sound, cost-effective chemical and biological remediation strategies.

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Section: Mixed Mineral Assemblages In Natural Systemsmentioning

confidence: 99%

Section: Mineralogy and Surface Chemistry Of Complex Mineral Assemblamentioning

confidence: 99%

Characterization of complex mineral assemblages: Implications for contaminant transport and environmental remediation

Bertsch

Seaman

1999

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

115

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“…This low sampling rate is a precaution against the mobilization of particles within the aquifer and subsequent introduction of colloidal artifacts that in the absence of pumping would be stationary (25,26). Purge water was monitored until pH, electrical conductivity, and dissolved oxygen stabilized.…”

Section: Methodsmentioning

confidence: 99%

Speciation, Mobility and Fate of Actinides in the Groundwater at the Hanford Site

Buesseler¹,

Dai²,

Repeta³

et al. 2003

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“…Based on SEM/EDX spectra, Kaplan et al (1994) were able to place the mobile colloids collected from the water table aquifer down gradient from an acidic seepage into one of four categories: (i) a phase containing only Si that was identified as quartz, (ii) an aluminosilicate phase containing an appreciable amount of K that was attributed to mica or hydroxy-interlayered vermiculite, (iii) an aluminosilicate that contained approximately a 1:l ratio of Si to AI that was identified as kaolinite, and (iv) a Ti rich Fe-oxide phase. Similar mineral classes of mobile colloids were also observed by Ryan and Gschwend (1990) for two Atlantic Coastal Plain aquifers in New Jersey.…”

Section: Wsrc-os-95-16mentioning

confidence: 99%

Colloid and ionic tracer migration within SRS sediments: Final summary

Strom

Seaman²,

Bertsch

et al. 1996

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Application of Synchrotron X-ray Fluorescence Spectroscopy and Energy Dispersive X-ray Analysis To Identify Contaminant Metals on Groundwater Colloids

Cited by 40 publications

References 4 publications

Characterization of complex mineral assemblages: Implications for contaminant transport and environmental remediation

Characterization of complex mineral assemblages: Implications for contaminant transport and environmental remediation

Speciation, Mobility and Fate of Actinides in the Groundwater at the Hanford Site

Colloid and ionic tracer migration within SRS sediments: Final summary

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