Details
| Original language | English |
|---|---|
| Pages (from-to) | 209-213 |
| Number of pages | 5 |
| Journal | GEODERMA |
| Volume | 209-210 |
| Publication status | Published - Nov 2013 |
Abstract
Dispersion is an important issue for clay leaching in soils. In this study, effects of various anions (Cl-, SO42-, acetate, oxalate and citrate) on dispersion of a kaolinitic soil clay were determined at different pH values and ionic strengths by dynamic light scattering and test tube experiments. Adsorption of anions on clay samples was characterized by the zeta potential (ζ) in a pH range of 2 to 11. At a pH range between 2 and 6, the effects of different anions on decreasing ζ were obvious and followed the order oxalate>citrate>SO42->Cl->acetate, while fluctuated changes in ζ were observed at pH>6. Based on a comparison of hydrodynamic radii (rh) obtained from dynamic light scattering and of transmission of 50% (T50 values) from the test tube experiments, the ability of anions to facilitate the dispersion of the clay fraction followed the sequence of oxalate>citrate>acetate>SO42->Cl-. It implies that adsorption of anions on positively charged edge sites of kaolinite resulting in a decrease in ζ is a key factor for dispersion of the clay fraction. Also, the results suggested that the dynamic light scattering can be used in combination with the test tube experiments in order to evaluate the effect of anions on dispersion at broader ranges of pH, ionic strength and clay concentration.
Keywords
- Anion effect, Dispersion, Kaolinitic soil, Light scattering, Test tube, Zeta potential
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Soil Science
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In: GEODERMA, Vol. 209-210, 11.2013, p. 209-213.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Effect of anions on dispersion of a kaolinitic soil clay
T2 - A combined study of dynamic light scattering and test tube experiments
AU - Nguyen, Minh Ngoc
AU - Dultz, Stefan
AU - Tran, Thu Thi Tuyet
AU - Bui, Anh Thi Kim
N1 - Funding information: This research was funded by the Vietnam National Foundation for Science & Technology Development (Project 105.09-2010.03 ).
PY - 2013/11
Y1 - 2013/11
N2 - Dispersion is an important issue for clay leaching in soils. In this study, effects of various anions (Cl-, SO42-, acetate, oxalate and citrate) on dispersion of a kaolinitic soil clay were determined at different pH values and ionic strengths by dynamic light scattering and test tube experiments. Adsorption of anions on clay samples was characterized by the zeta potential (ζ) in a pH range of 2 to 11. At a pH range between 2 and 6, the effects of different anions on decreasing ζ were obvious and followed the order oxalate>citrate>SO42->Cl->acetate, while fluctuated changes in ζ were observed at pH>6. Based on a comparison of hydrodynamic radii (rh) obtained from dynamic light scattering and of transmission of 50% (T50 values) from the test tube experiments, the ability of anions to facilitate the dispersion of the clay fraction followed the sequence of oxalate>citrate>acetate>SO42->Cl-. It implies that adsorption of anions on positively charged edge sites of kaolinite resulting in a decrease in ζ is a key factor for dispersion of the clay fraction. Also, the results suggested that the dynamic light scattering can be used in combination with the test tube experiments in order to evaluate the effect of anions on dispersion at broader ranges of pH, ionic strength and clay concentration.
AB - Dispersion is an important issue for clay leaching in soils. In this study, effects of various anions (Cl-, SO42-, acetate, oxalate and citrate) on dispersion of a kaolinitic soil clay were determined at different pH values and ionic strengths by dynamic light scattering and test tube experiments. Adsorption of anions on clay samples was characterized by the zeta potential (ζ) in a pH range of 2 to 11. At a pH range between 2 and 6, the effects of different anions on decreasing ζ were obvious and followed the order oxalate>citrate>SO42->Cl->acetate, while fluctuated changes in ζ were observed at pH>6. Based on a comparison of hydrodynamic radii (rh) obtained from dynamic light scattering and of transmission of 50% (T50 values) from the test tube experiments, the ability of anions to facilitate the dispersion of the clay fraction followed the sequence of oxalate>citrate>acetate>SO42->Cl-. It implies that adsorption of anions on positively charged edge sites of kaolinite resulting in a decrease in ζ is a key factor for dispersion of the clay fraction. Also, the results suggested that the dynamic light scattering can be used in combination with the test tube experiments in order to evaluate the effect of anions on dispersion at broader ranges of pH, ionic strength and clay concentration.
KW - Anion effect
KW - Dispersion
KW - Kaolinitic soil
KW - Light scattering
KW - Test tube
KW - Zeta potential
UR - http://www.scopus.com/inward/record.url?scp=84880426407&partnerID=8YFLogxK
U2 - 10.1016/j.geoderma.2013.06.024
DO - 10.1016/j.geoderma.2013.06.024
M3 - Article
AN - SCOPUS:84880426407
VL - 209-210
SP - 209
EP - 213
JO - GEODERMA
JF - GEODERMA
SN - 0016-7061
ER -