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 548905
Title Using chromatographic and spectroscopic parameters to characterize preference and kinetics in the adsorption of humic and fulvic acid to goethite
Author(s) Wang, Long; Li, Yongtao; Weng, Liping; Sun, Yang; Ma, Jie; Chen, Yali
Source Science of the Total Environment 666 (2019). - ISSN 0048-9697 - p. 766 - 777.
DOI https://doi.org/10.1016/j.scitotenv.2019.02.235
Department(s) WIMEK
Soil Chemistry and Chemical Soil Quality
Publication type Refereed Article in a scientific journal
Publication year 2019
Keyword(s) Fulvic acid - Humic acid - Kinetics - Oxide minerals - Preferential adsorption - Replacement
Abstract

Humic substances (HS) are very heterogeneous, and preferential adsorption of certain components takes place during their interaction with minerals. Our results indicated that for fulvic acid (FA) the relatively large (3.6–18.2 kDa) particles were preferred in the adsorption to goethite, whereas for humic acid (HA) the intermediate sized (3.6–12.0 kDa) fractions were preferred. Correlations between molar mass (M w ) and specific UV absorption values (SUVA) with ratios of UV light absorbance (E 2 /E 3 , E 4 /E 6 ) were observed. The adsorption did not change the relation between E 2 /E 3 and M w , E 4 /E 6 and SUVA. The E 2 /E 3 and E 4 /E 6 can probably be used as indicators of molar mass and aromaticity of HS in studying the preferential adsorption. The adsorption of HA and FA to goethite was fast and reached a steady state in about 6 h. The intermediate sized HA particles (3.6–12.0 kDa) were adsorbed quickly, and part of them was subsequently replaced by somewhat larger particles (>50 kDa). For FA, preferential adsorption of relative large particles (3.6–18.2 kDa) took place quickly, and there was a limited substitution by particles with higher aromaticity. Without specifying the property especially the molar mass range of HS under study, confusion can arise from researches using different HS materials.

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