Details
| Original language | English |
|---|---|
| Pages (from-to) | 111-127 |
| Number of pages | 17 |
| Journal | Water, Air, & Soil Pollution |
| Volume | 72 |
| Issue number | 1-4 |
| Publication status | Published - Jan 1994 |
| Externally published | Yes |
Abstract
For a one year period intact Spodosol soil columns were percolated weekly with H2Odeion, 1.58 mmol H2SO4 L-1, and 0.79 mmol H2SO4 L-1+0.64 mmol HNO3 L-1, respectively. Decomposition rates, soil organic carbon (OC) solubilization, dissolved organic carbon (DOC) fractions, and Cr-, Cu-, and Cd-binding by dissolved hydrophobic and hydrophilic acids were studied. Acid treatment reduced significantly OC respiration as well as OC solubilization in the humic layers. The reduced OC solubility at acid addition was more pronounced for the less polar hydrophobic compounds, resulting in a decrease of the hydrophobic acids (from ca. 65 to 40-45% of DOC), and in an increase of the hydrophilic acids (from ca. 25 to 40-45% of DOC). For B horizon leachates, DOC increased at acid treatment. Generally, hydrophobic acids were retained preferentially in the B horizon. Also in the B horizon output there was an increase of the hydrophilic acids as acidity increased (from ca. 40 to 50% of DOC). Differences between the two acid treatments were negligible. The degree of metal-organic complexes decreased in the order Cr >Cu >Cd, from A to B horizon leachates, and with increasing acidity. Hydrophilic acids were found to be the dominating ligands in complexing Cr and Cu. Actual Cr- and Cu-binding by hydrophilic acids exceeded that by hydrophobic acids 2-8 times. As the hydrophilic acids represented the most mobile DOC components in the soil columns, in particular with increasing acidity, significant amounts of Cr and Cu in the B horizon leachates were organically complexed, although a great proportion of the hydrophobic acids was retained in the B horizon.
ASJC Scopus subject areas
- Environmental Science(all)
- Environmental Engineering
- Environmental Science(all)
- Environmental Chemistry
- Environmental Science(all)
- Ecological Modelling
- Environmental Science(all)
- Water Science and Technology
- Environmental Science(all)
- Pollution
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In: Water, Air, & Soil Pollution, Vol. 72, No. 1-4, 01.1994, p. 111-127.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Heavy metal binding by hydrophobic and hydrophilic dissolved organic carbon fractions in a Spodosol A and B horizon
AU - Guggenberger, Georg
AU - Glaser, Bruno
AU - Zech, Wolfgang
PY - 1994/1
Y1 - 1994/1
N2 - For a one year period intact Spodosol soil columns were percolated weekly with H2Odeion, 1.58 mmol H2SO4 L-1, and 0.79 mmol H2SO4 L-1+0.64 mmol HNO3 L-1, respectively. Decomposition rates, soil organic carbon (OC) solubilization, dissolved organic carbon (DOC) fractions, and Cr-, Cu-, and Cd-binding by dissolved hydrophobic and hydrophilic acids were studied. Acid treatment reduced significantly OC respiration as well as OC solubilization in the humic layers. The reduced OC solubility at acid addition was more pronounced for the less polar hydrophobic compounds, resulting in a decrease of the hydrophobic acids (from ca. 65 to 40-45% of DOC), and in an increase of the hydrophilic acids (from ca. 25 to 40-45% of DOC). For B horizon leachates, DOC increased at acid treatment. Generally, hydrophobic acids were retained preferentially in the B horizon. Also in the B horizon output there was an increase of the hydrophilic acids as acidity increased (from ca. 40 to 50% of DOC). Differences between the two acid treatments were negligible. The degree of metal-organic complexes decreased in the order Cr >Cu >Cd, from A to B horizon leachates, and with increasing acidity. Hydrophilic acids were found to be the dominating ligands in complexing Cr and Cu. Actual Cr- and Cu-binding by hydrophilic acids exceeded that by hydrophobic acids 2-8 times. As the hydrophilic acids represented the most mobile DOC components in the soil columns, in particular with increasing acidity, significant amounts of Cr and Cu in the B horizon leachates were organically complexed, although a great proportion of the hydrophobic acids was retained in the B horizon.
AB - For a one year period intact Spodosol soil columns were percolated weekly with H2Odeion, 1.58 mmol H2SO4 L-1, and 0.79 mmol H2SO4 L-1+0.64 mmol HNO3 L-1, respectively. Decomposition rates, soil organic carbon (OC) solubilization, dissolved organic carbon (DOC) fractions, and Cr-, Cu-, and Cd-binding by dissolved hydrophobic and hydrophilic acids were studied. Acid treatment reduced significantly OC respiration as well as OC solubilization in the humic layers. The reduced OC solubility at acid addition was more pronounced for the less polar hydrophobic compounds, resulting in a decrease of the hydrophobic acids (from ca. 65 to 40-45% of DOC), and in an increase of the hydrophilic acids (from ca. 25 to 40-45% of DOC). For B horizon leachates, DOC increased at acid treatment. Generally, hydrophobic acids were retained preferentially in the B horizon. Also in the B horizon output there was an increase of the hydrophilic acids as acidity increased (from ca. 40 to 50% of DOC). Differences between the two acid treatments were negligible. The degree of metal-organic complexes decreased in the order Cr >Cu >Cd, from A to B horizon leachates, and with increasing acidity. Hydrophilic acids were found to be the dominating ligands in complexing Cr and Cu. Actual Cr- and Cu-binding by hydrophilic acids exceeded that by hydrophobic acids 2-8 times. As the hydrophilic acids represented the most mobile DOC components in the soil columns, in particular with increasing acidity, significant amounts of Cr and Cu in the B horizon leachates were organically complexed, although a great proportion of the hydrophobic acids was retained in the B horizon.
UR - http://www.scopus.com/inward/record.url?scp=0028182134&partnerID=8YFLogxK
U2 - 10.1007/BF01257119
DO - 10.1007/BF01257119
M3 - Article
AN - SCOPUS:0028182134
VL - 72
SP - 111
EP - 127
JO - Water, Air, & Soil Pollution
JF - Water, Air, & Soil Pollution
SN - 0049-6979
IS - 1-4
ER -