Using chromatographic and spectroscopic parameters to characterize preference and kinetics in the adsorption of humic and fulvic acid to goethite

Long Wang, Yongtao Li, Liping Weng*, Yang Sun, Jie Ma, Yali Chen

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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.

Original languageEnglish
Pages (from-to)766-777
Number of pages12
JournalScience of the Total Environment
Volume666
DOIs
Publication statusPublished - 20 May 2019

Fingerprint

Humic Substances
fulvic acid
goethite
humic acid
humic substance
adsorption
Adsorption
kinetics
Kinetics
Acids
Molar mass
absorbance
parameter
Ultraviolet radiation
substitution
Minerals
particle
Substitution reactions
mineral

Keywords

  • Fulvic acid
  • Humic acid
  • Kinetics
  • Oxide minerals
  • Preferential adsorption
  • Replacement

Cite this

@article{4baf1821a3534b69a0d1c54675d8adba,
title = "Using chromatographic and spectroscopic parameters to characterize preference and kinetics in the adsorption of humic and fulvic acid to goethite",
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.",
keywords = "Fulvic acid, Humic acid, Kinetics, Oxide minerals, Preferential adsorption, Replacement",
author = "Long Wang and Yongtao Li and Liping Weng and Yang Sun and Jie Ma and Yali Chen",
year = "2019",
month = "5",
day = "20",
doi = "10.1016/j.scitotenv.2019.02.235",
language = "English",
volume = "666",
pages = "766--777",
journal = "Science of the Total Environment",
issn = "0048-9697",
publisher = "Elsevier",

}

Using chromatographic and spectroscopic parameters to characterize preference and kinetics in the adsorption of humic and fulvic acid to goethite. / Wang, Long; Li, Yongtao; Weng, Liping; Sun, Yang; Ma, Jie; Chen, Yali.

In: Science of the Total Environment, Vol. 666, 20.05.2019, p. 766-777.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Using chromatographic and spectroscopic parameters to characterize preference and kinetics in the adsorption of humic and fulvic acid to goethite

AU - Wang, Long

AU - Li, Yongtao

AU - Weng, Liping

AU - Sun, Yang

AU - Ma, Jie

AU - Chen, Yali

PY - 2019/5/20

Y1 - 2019/5/20

N2 - 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.

AB - 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.

KW - Fulvic acid

KW - Humic acid

KW - Kinetics

KW - Oxide minerals

KW - Preferential adsorption

KW - Replacement

U2 - 10.1016/j.scitotenv.2019.02.235

DO - 10.1016/j.scitotenv.2019.02.235

M3 - Article

VL - 666

SP - 766

EP - 777

JO - Science of the Total Environment

JF - Science of the Total Environment

SN - 0048-9697

ER -