| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
Department of Soil Science, Univ. of Saskatchewan, 51 Campus Drive, Saskatoon, SK, Canada, S7N 5A8
*Corresponding author.
ABSTRACT
Competition between low molecular weight (LMW) organic acids and selenite for sorption sites on hydrous metal oxides is an important factor affecting the dynamics of Se in soils and associated environments. Equilibrium and kinetic studies on the competition between selenite and 12 LMW organic acids (acetic, aspartic, citric, formic, glycine, glycolic, p-hydroxybenzoic, malic, oxalic, salicylic, succinic, and tartaric) for the sorption sites on short-range ordered Al hydroxides were investigated using the batch method. The equilibrium and kinetic results showed that the influence of the organic acids on selenite sorption by Al hydroxides depended on the concentration, structure, and functionality of the organic acids. The competitiveness of the organic acids with selenite for the sorption sites increased with increasing organic acid concentration. Generally, the larger the stability constant of the Al-organic solution complexes (KAl-L), the more effective the organic acid was in competing with selenite for the sorption sites of the Al hydroxides. However, some of the organic acids competed less successfully than expected based on their KAl-L values. This is attributed to the stereochemical and electrostatic effects originating from both the surface of the Al hydroxides and the organic acids, which lowered the ability of some organic acids to compete with selenite for the sorption sites of the Al hydroxides. Moreover, the kinetic results revealed that the organic acids competed with selenite for the sorption sites primarily in the early reaction period (<3 h), and subsequently, it was this period that was largely responsible for the equilibrium level of selenite sorbed by the Al hydroxides. The findings are of fundamental significance in understanding the role of organic acids in influencing the fate of Se in the environment.
Received for publication August 14, 1995.
This article has been cited by other articles:
|
|
 |
|
  A. A. Jara, A. Violante, M. Pigna, and M. de la Luz Mora Mutual Interactions of Sulfate, Oxalate, Citrate, and Phosphate on Synthetic and Natural Allophanes Soil Sci. Soc. Am. J., February 2, 2006; 70(2): 337 - 346. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
F. J. Sikora A Buffer that Mimics the SMP Buffer for Determining Lime Requirement of Soil Soil Sci. Soc. Am. J., February 2, 2006; 70(2): 474 - 486. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
U. K. Saha, C. Liu, L. M. Kozak, and P. M. Huang Kinetics of Selenite Adsorption on Hydroxyaluminum- and Hydroxyaluminosilicate-Montmorillonite Complexes Soil Sci. Soc. Am. J., July 1, 2004; 68(4): 1197 - 1209. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
H. Wijnja and C. P. Schulthess Effect of Carbonate on the Adsorption of Selenate and Sulfate on Goethite Soil Sci. Soc. Am. J., July 1, 2002; 66(4): 1190 - 1197. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. De Cristofaro, J.Z. He, D.H. Zhou, and A. Violante Adsorption of Phosphate and Tartrate on Hydroxy-Aluminum-Oxalate Precipitates Soil Sci. Soc. Am. J., July 1, 2000; 64(4): 1347 - 1355. [Abstract] [Full Text]
|
|
|
|
|
|
H. Wijnja and C.P. Schulthess Interaction of Carbonate and Organic Anions with Sulfate and Selenate Adsorption on an Aluminum Oxide Soil Sci. Soc. Am. J., May 1, 2000; 64(3): 898 - 908. [Abstract] [Full Text]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
| The SCI Journals | Agronomy Journal | Crop Science | |||
| Journal of Natural Resources and Life Sciences Education |
Vadose Zone Journal | ||||
| Journal of Plant Registrations | Journal of Environmental Quality |
The Plant Genome | |||
