Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 551138
Title A systematic evaluation of Flow Field Flow Fractionation and single-particle ICP-MS to obtain the size distribution of organo-mineral iron oxyhydroxide colloids
Author(s) Moens, Claudia; Waegeneers, Nadia; Fritzsche, Andreas; Nobels, Peter; Smolders, Erik
Source Journal of Chromatography. A, Including electrophoresis and other separation methods 1599 (2019). - ISSN 0021-9673 - p. 203 - 214.
Department(s) CBLB Bodemscheikunde
Publication type Refereed Article in a scientific journal
Publication year 2019
Keyword(s) Flow Field Flow Fractionation - Multimethod comparison - Organo-mineral iron oxyhydroxide colloids - Particle size distribution - Single-particle inductively coupled plasma-mass spectrometry - Triple quadrupole mass spectrometry

Colloidal iron(III)oxyhydroxides (FeOx)are important reactive adsorbents in nature. This study was set up to determine the size of environmentally relevant FeOx colloids with new methods, i.e. Flow Field Flow Fractionation (FlFFF-UV-ICP-MS)and single-particle ICP-MS/MS (sp-ICP-MS)and to compare these with standard approaches, i.e. dynamic light scattering (DLS), nanoparticle tracking analysis (NTA), microscopy (TEM), membrane filtration, centrifugation and dialysis. Seven synthetic nano- and submicron FeOx with different mineralogy and coating were prepared and two soil solutions were included. The FlFFF was optimized for Fe recovery, yielding 70–90%. The FlFFF determines particle size with high resolution in a 1 mM NH 4 HCO 3 (pH 8.3)background and can detect Fe-NOM complexes <5 nm and organo-mineral FeOx particles ranging 5–300 nm. The sp-ICP-MS method had a size detection limit for FeOx of about 32–47 nm. The distribution of hydrodynamic diameters of goethite particles detected with FlFFF, NTA and DLS were similar but the values were twice as large as the Fe cores of particles detected with sp-ICP-MS and TEM. Conventional fractionation by centrifugation and dialysis generally yielded similar fractions as FlFFF but membrane filtration overestimated the large size fractions. Particles formed from Fe(II)oxidation in the presence of NOM showed strikingly smaller organo-mineral Fe-Ox colloids as the NOM/Fe ratio increased. The soil solution obtained with centrifugation of an acid peat was dominated by small (<30 nm)Fe-OM complexes and organo-mineral FeOx colloids whereas that of a mineral pH neutral soil mainly contains larger (30–200 nm)Fe-rich particles. The FlFFF-UV-ICP-MS is recommended for environmental studies of colloidal FeOx since it has a wide size detection range, it fractionates in an environmentally relevant background (1 mM NH 4 HCO 3 )and it has acceptable element recoveries.

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