Aquatic colloids relevant to radionuclide migration: characterization by size fractionation and ICP-mass spectrometric detection

Geckeis, Horst; Manh, Thang Ngo; Bouby, M.; Kim, J.I

doi:10.1016/s0927-7757(02)00564-2

Cited by 59 publications

(37 citation statements)

References 18 publications

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“…[1][2][3][4][5][6] A better understanding of the role of molar mass distributions on metal binding properties of COM is, therefore, important to predict metal mobility, speciation, and bioavailability in aquatic systems. [7,8] The residence times of the colloidal pool (and associated metals) can be different from those of the particulate fraction by orders of magnitude, but unlike the 'dissolved' fraction, COM can undergo different processes such as coagulation, [9][10][11][12][13][14][15] gel formation, and sedimentation. [16][17][18][19] Acidic polysaccharides, which are intermittently biologically produced by algae and bacteria, represent an important portion of the COM pool.…”

Section: Introductionmentioning

confidence: 99%

“…[10][11][12]15] Developed as a variant of the symmetric flow field flow fractionation technique, asymmetrical flow field flow fractionation (aFlFFF) is one of the several subtechniques recognized in field-flow fractionation that has attracted attention for its improved separation efficiency and for allowing visual inspection of the inside of the channel. aFlFFF has shown particular versatility in the analysis of colloidal samples with a variable size fractionation window spanning at least 15-fold in size for a given set of conditions.…”

Section: Introductionmentioning

confidence: 99%

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Asymmetrical Flow Field Flow Fractionation - Multidetection System as a Tool for Studying Metal - Alginate Interactions

Alasonati

Stolpe²,

Benincasa³

et al. 2006

Environ. Chem.

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Abstract. The present study explores the potential use of asymmetrical flow field flow fractionation (aFlFFF) with a multidetection system for the study of metal-alginate interactions. aFlFFF, coupled on-line to a differential refractive index and seven angle laser light scattering detectors was used to provide information on the alginate size distributions. In parallel, the metal distributions of metal-alginate complexes were probed by aFlFFF-high resolution inductively coupled plasma-mass spectrometry. Average values and continuous distributions of molar masses, radiuses of gyration and hydrodynamic radiuses, which are critical for understanding the role of alginates as carriers of metal pollutants, were evaluated in presence of Pb or Cd and compared with those in metal-free solutions of alginate. The values of number average and weight average molar mass, weight average radius of gyration and shape factor for alginate were 150 and 188 kg mol −1 , 53 nm and 1.7, respectively. Alginate molar mass and radius of gyration distributions were slightly shifted to higher values by the addition of micromolar concentrations of Pb or Cd. The alginate size distribution in the presence of Cd was similar to the alginate-alone control, whereas in the presence of Pb the size distribution was broader with a shift of the maximum toward higher molar masses.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Asymmetrical Flow Field Flow Fractionation - Multidetection System as a Tool for Studying Metal - Alginate Interactions

Alasonati

Stolpe²,

Benincasa³

et al. 2006

Environ. Chem.

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“…Since Si occurs in a "truly" dissolved state, Al may not be presented as clay colloids with the grain size >0.45 µm in groundwaters. Geckeis et al (2003) observed that Al is controlled by Al oxyhydroxides. Therefore, it implies that Al oxyhydroxides and/or Al oxyhydroxide- organic complexes could be possible carrier for Cd and Pb in the groundwaters (Figs.…”

Section: Filtered Vs Unfiltered Samplesmentioning

confidence: 99%

Role of colloidal particles for hydrogeochemistry in As-affected aquifers of the Hetao Basin, Inner Mongolia

et al. 2009

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High As groundwater was found in shallow aquifers of the Hetao Basin, Inner Mongolia, which has caused serious chronic arsenism. Groundwater particles are ubiquitous in natural aquifers, and significantly affect As mobilization and transportation. This study has investigated their effect on element hydrogeochemistry. Groundwater samples were filtered in the field through a progressively decreasing pore size (10, 5, 3, 1, 0.8, 0.45 µm). Unfiltered samples were also taken. Chemical analysis of 43 groundwater samples shows concentrations of most elements (Ba, Co, Mn, Mo, Ni, V, Sr, Mg, Ca, Na, K) in unfiltered samples are well correlated with those in <0.45 µm fraction, and the ratios between them are close to 1.00. Those elements are considered to be present in the form of true dissolved group and are not affected by the filtration. Although saturation indices for calcite and dolomite are greater than 0, they could possibly exist as small size colloids (<0.45 µm) in groundwater. Concentrations of Cd, Pb, Fe, and Al in <0.45 µm fraction are mostly less than those in unfiltered fraction, implying that large-size inorganic-rich (Al/Fe complexing) colloids could be possible carrier for Cd and Pb in the groundwaters. Arsenic, Cu, Zn and Cr are fallen into another group. These elements could mainly be associated with organic-complexing colloids with particle size less than 0.45 µm, although As could partially be carried by large-size colloids. In groundwaters saturated with respect to pyrite and siderite, a small proportion of As (about 15%) is associated with large-size Fe complexing particles (>0.45 µm). Larger amounts of As is trapped with small size organic colloids, which has been confirmed by the ultrafiltration. The study suggests that groundwater particles transported in the aquifers could affect element geochemistry, especially for As expected to be associated in small size complexes.

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“…Another technique widely used for size separation of humic materials is fi eld -fl ow fractionation (FFF) (e.g., Baalousha et al, 2006 ;Boehme and Wells, 2006 ;Geckeis et al, 2003 ;Hassil ' ov et al, 2007;Siripinyanond et al, 2005 ;Suteerapataranon et al, 2006 ;Zanardi -Lamardo et al, 2002 ). This technique was developed and introduced in 1966 by Giddings (1966) as a method for the separation and characterization of materials ranging in size from macromolecules to particulates.…”

Section: Field -Flow Fractionation ( Fff )mentioning

confidence: 99%

“…Size characteristics were reported by several authors (Baalousha et al, 2006 ;Boehme and Wells, 2006 ;Geckeis et al, 2003 ;Siripinyanond et al, 2005 ;Suteerapataranon et al, 2006 ;Zanardi -Lamardo et al, 2002 ). Over the past decade, about 20 papers were published on FlFFF fractionation of humic materials.…”

Section: Use Of Field -Flow Fractionation For the Separation Of Humicmentioning

confidence: 99%

Separation Technology as a Powerful Tool for Unfolding Molecular Complexity of Natural Organic Matter and Humic Substances

Perminova

Konstantinov

Kunenkov

et al. 2009

Biophysico‐Chemical Processes Involving Natural Nonliving Organic Matter in Environmental Systems

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Aquatic colloids relevant to radionuclide migration: characterization by size fractionation and ICP-mass spectrometric detection

Cited by 59 publications

References 18 publications

Asymmetrical Flow Field Flow Fractionation - Multidetection System as a Tool for Studying Metal - Alginate Interactions

Asymmetrical Flow Field Flow Fractionation - Multidetection System as a Tool for Studying Metal - Alginate Interactions

Role of colloidal particles for hydrogeochemistry in As-affected aquifers of the Hetao Basin, Inner Mongolia

Separation Technology as a Powerful Tool for Unfolding Molecular Complexity of Natural Organic Matter and Humic Substances

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