Characterization of metal binding sites in fulvic acids by lanthanide ion probe spectroscopy

Dobbs, J. C.; Susetyo, W.; Knight, F. E.; Castles, Mark; Carreira, L. A.; Azarraga, L. V.

doi:10.1021/ac00180a020

Cited by 75 publications

(46 citation statements)

References 17 publications

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“…The database of MINTEQA2 includes over 900 dissolved species, 500 dissolved mineral species, and 13 species representing complexes of a number of heavy metals with DOM. In this model, DOM is treated as a complex material consisting of various types of monoprotic acid sites and was assumed to be normally distributed with respect to their log K values for protons and metals (32). The stability constants of metal-organic complexes obtained using Scatchard plot approach has been the method of choice in most of the recent studies on metal binding by organic acids (33,34).…”

Section: Resultsmentioning

confidence: 99%

Solid−Solution Speciation and Phytoavailability of Copper and Zinc in Soils

Krishnamurti

Naidu

2002

Environ. Sci. Technol.

132

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The soil solution speciation and solid-phase fractionation of copper (Cu) and zinc (Zn) in 11 typical uncontaminated soils of South Australia were assessed in relation to heavy metal phytoavailability. The soils were analyzed for pH (4.9-8.4), soil organic matter content (3.5 to 23.8 g of C kg(-1)), total soil solution metal concentrations, Cu8 (49-358 microg kg(-1)) and Zn8 (121-582 microg kg(-1)), and dissolved organic matter (DOM) (69-827 mg of C L(-1)). The solid-liquid partition coefficient (Kd) ranged from between 13.9 and 152.4 L kg(-1) for Cu and 22.6 to 266.3 L kg(-1) for Zn. The phytoavailability of Cu and Zn could be predicted significantly using an empirical model with the solid-phase fractions of Cu and Zn, as obtained from selective sequential extraction scheme, as components. Phytoavailable Cu and Zn were found to significantly correlate with fulvic complex Cu (r= 0.944, P < 0.0001) and exchangeable Zn (r = 0.832, P = 0.002), respectively. The fulvic complex Cu was found to explain 89.2% of the variation in phytoavailable Cu, where as, the exchangeable Zn together with fulvic complex Zn could explain 78.9% of the variation in phytoavailable Zn. The data presented demonstrate the role of solid-phase metal fractions in understanding the heavy metal phytoavailability. The assessment of the role of solid-phase fractions in heavy metal phytoavailability is a neglected area of study and deserves close attention.

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Section: Resultsmentioning

confidence: 99%

Solid−Solution Speciation and Phytoavailability of Copper and Zinc in Soils

Krishnamurti

Naidu

2002

Environ. Sci. Technol.

132

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“…A powerful, but less frequently used, method for studying the complexation of trace metal cations by DOM is lanthanide ion probe spectroscopy (Dobbs et al, 1989). In this method, fluorescence intensities of Eu(III) at two emission wavelengths are used to determine the proportions of complexed and free Eu(III).…”

Section: Dom and Chemical Speciation Of Trace Metal Cationsmentioning

confidence: 99%

Dissolved Organic Matter in Freshwaters

Perdue

Ritchie

2014

Treatise on Geochemistry

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“…This technique has been used to study the Ln(III)/HS interactions, and the rationale was to either determine interaction constants [37,39,40], or gather information on the Ln/An(III) chemical environment [26,[41][42][43][44][45][46][47][48]. The observed luminescence corresponds to the 5 D 0 → 7 F 0 transition (electric and magnetic dipole forbidden, maximum around 580 nm), the 5 D 0 → 7 F 1 transition (magnetic dipole, maximum around 593 nm), and the 5 D 0 → 7 F 2 'hypersensitive' transition (electric dipole, maximum around 615 nm).…”

Section: Time-resolved Luminescence Spectroscopymentioning

confidence: 99%

“…4. These curves were obtained from the evolution of the 5 D 0 → 7 F 2 / 5 D 0 → 7 F 1 peak area ratios [26,39]. Three groups of fractions can be proposed.…”

Section: Comparisons Of the Complexometric Titrationsmentioning

confidence: 99%

Europium(III) complexed by HPSEC size-fractions of a vertisol humic acid: Small differences evidenced by time-resolved luminescence spectroscopy

Reiller

Brevet

Nebbioso

et al. 2011

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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The size fractionation of a humic acid (HA) by high performance size exclusion chromatography (HPSEC) was used as a proxy for the filtration effect during HA transport through a porous medium with minimum specific chemical interactions. The modification of the Eu(III)-HA complexes' formation with the different size-fractions, as compared to the bulk HA, was studied in time-resolved luminescence spectroscopy (TRLS). Clear modifications in Eu(III)-HA complexes' structures were shown and related to the molecular characteristics of the separated size-fractions. The properties of most of size-fractions did not induce a major alteration of the affinity towards Eu(III). Only the most hydrophilic fractions eluted in the tail of the chromatographic peak, representing about 11% of total fractions-weight, gave some significantly different parameters. Using a simplistic complexation model, it was found that the available complexation sites decreased with the size reduction of humic fractions.

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Characterization of metal binding sites in fulvic acids by lanthanide ion probe spectroscopy

Cited by 75 publications

References 17 publications

Solid−Solution Speciation and Phytoavailability of Copper and Zinc in Soils

Solid−Solution Speciation and Phytoavailability of Copper and Zinc in Soils

Dissolved Organic Matter in Freshwaters

Europium(III) complexed by HPSEC size-fractions of a vertisol humic acid: Small differences evidenced by time-resolved luminescence spectroscopy

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