Details
| Original language | English |
|---|---|
| Pages (from-to) | 141-149 |
| Number of pages | 9 |
| Journal | Journal of Plant Nutrition and Soil Science |
| Volume | 177 |
| Issue number | 2 |
| Publication status | Published - Apr 2014 |
Abstract
The objective of this study was to investigate the effects of mono- and polyvalent cations on sorption of the two hydrophobic compounds nonylphenol (NP) and phenanthrene (Phe). To this end, exchange sites of a sandy soil were saturated with either Na+, Ca2+, or Al3+ and excess salts were removed by washing. The samples were then sterilized and either stored moist, dried at room temperature, or at 20°C, 60°C, or 105°C in a vented oven. Saturation with Na+ led to an increase of dissolved organic C (DOC) concentration in the soil water extracts, whereas the polyvalent cations Ca2+ and Al3+ decreased it. The 1H-NMR relaxometry analyses showed that Al3+ restricted the mobility of water molecules that are confined within the SOM structure to a higher extent than Ca2+ or Na+. According to contact-angle (CA) analyses, cation treatment did not significantly change the wetting properties of the samples. Batch sorption-desorption experiments showed no clear salt-treatment effects on the sorption and desorption equilibria or kinetics of NP and Phe. Instead, the sorption coefficients and sorption hysteresis of NP and Phe increased in dry soil. With increasing drying temperature the CA of the soils and the sorption of both xenobiotics increased significantly. We conclude that structural modifications of SOM due to incorporation of polyvalent cations into the interphase structure do not modify the sorption characteristics of the soil for hydrophobic compounds. Instead, increasing hydrophobization of organic soil constituents due to heat treatment significantly increased the accessible sorption sites for nonpolar organic compounds in this soil.
Keywords
- Aluminum, Calcium, Contact angle, Relaxation time, Sodium, Soil organic matter, Wettability
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Soil Science
- Agricultural and Biological Sciences(all)
- Plant Science
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In: Journal of Plant Nutrition and Soil Science, Vol. 177, No. 2, 04.2014, p. 141-149.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Cation treatment and drying-temperature effects on nonylphenol and phenanthrene sorption to a sandy soil
AU - Shchegolikhina, Anastasia
AU - Kunhi mouvenchery, Yamuna
AU - Woche, Susanne K.
AU - Bachmann, Jörg
AU - Schaumann, Gabriele E.
AU - Marschner, Bernd
N1 - Copyright: Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2014/4
Y1 - 2014/4
N2 - The objective of this study was to investigate the effects of mono- and polyvalent cations on sorption of the two hydrophobic compounds nonylphenol (NP) and phenanthrene (Phe). To this end, exchange sites of a sandy soil were saturated with either Na+, Ca2+, or Al3+ and excess salts were removed by washing. The samples were then sterilized and either stored moist, dried at room temperature, or at 20°C, 60°C, or 105°C in a vented oven. Saturation with Na+ led to an increase of dissolved organic C (DOC) concentration in the soil water extracts, whereas the polyvalent cations Ca2+ and Al3+ decreased it. The 1H-NMR relaxometry analyses showed that Al3+ restricted the mobility of water molecules that are confined within the SOM structure to a higher extent than Ca2+ or Na+. According to contact-angle (CA) analyses, cation treatment did not significantly change the wetting properties of the samples. Batch sorption-desorption experiments showed no clear salt-treatment effects on the sorption and desorption equilibria or kinetics of NP and Phe. Instead, the sorption coefficients and sorption hysteresis of NP and Phe increased in dry soil. With increasing drying temperature the CA of the soils and the sorption of both xenobiotics increased significantly. We conclude that structural modifications of SOM due to incorporation of polyvalent cations into the interphase structure do not modify the sorption characteristics of the soil for hydrophobic compounds. Instead, increasing hydrophobization of organic soil constituents due to heat treatment significantly increased the accessible sorption sites for nonpolar organic compounds in this soil.
AB - The objective of this study was to investigate the effects of mono- and polyvalent cations on sorption of the two hydrophobic compounds nonylphenol (NP) and phenanthrene (Phe). To this end, exchange sites of a sandy soil were saturated with either Na+, Ca2+, or Al3+ and excess salts were removed by washing. The samples were then sterilized and either stored moist, dried at room temperature, or at 20°C, 60°C, or 105°C in a vented oven. Saturation with Na+ led to an increase of dissolved organic C (DOC) concentration in the soil water extracts, whereas the polyvalent cations Ca2+ and Al3+ decreased it. The 1H-NMR relaxometry analyses showed that Al3+ restricted the mobility of water molecules that are confined within the SOM structure to a higher extent than Ca2+ or Na+. According to contact-angle (CA) analyses, cation treatment did not significantly change the wetting properties of the samples. Batch sorption-desorption experiments showed no clear salt-treatment effects on the sorption and desorption equilibria or kinetics of NP and Phe. Instead, the sorption coefficients and sorption hysteresis of NP and Phe increased in dry soil. With increasing drying temperature the CA of the soils and the sorption of both xenobiotics increased significantly. We conclude that structural modifications of SOM due to incorporation of polyvalent cations into the interphase structure do not modify the sorption characteristics of the soil for hydrophobic compounds. Instead, increasing hydrophobization of organic soil constituents due to heat treatment significantly increased the accessible sorption sites for nonpolar organic compounds in this soil.
KW - Aluminum
KW - Calcium
KW - Contact angle
KW - Relaxation time
KW - Sodium
KW - Soil organic matter
KW - Wettability
UR - http://www.scopus.com/inward/record.url?scp=84898056717&partnerID=8YFLogxK
U2 - 10.1002/jpln.201200503
DO - 10.1002/jpln.201200503
M3 - Article
AN - SCOPUS:84898056717
VL - 177
SP - 141
EP - 149
JO - Journal of Plant Nutrition and Soil Science
JF - Journal of Plant Nutrition and Soil Science
SN - 1436-8730
IS - 2
ER -