The effect of time on the competition between anions for sorption

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Solutions of phosphate and of selenite were gently mixed with a soil, both separately and in combination, for periods ranging from 15 min to 30 days. For both anions, the solution concentration continued to decrease throughout the period, but the decrease was more marked for phosphate. Competitive effects were smallest after brief periods of mixing, and increased with time. Phosphate was a more effective competitor for sorption than selenite, and its competitive advantage increased with time. The observed effects were closely described by a mechanistic model. According to the model, competition was largely through changes in the electric potential of the surface rather than through decreases in the number of vacant adsorption sites. This explained why competition effects were initially small. This was especially so for phosphate, which was modelled as having a marked continuing diffusive penetration of the surface. The decrease in electric potential associated with that penetration decreased the surface concentration of selenite and so decreased the rate of penetration of selenite. By the end of the experiment this was the most important aspect of the competitive effect of phosphate on selenite.

Original languageEnglish
Pages (from-to)421-428
Number of pages8
JournalJournal of Soil Science
Volume43
Issue number3
DOIs
Publication statusPublished - 1 Jan 1992

Fingerprint

Selenious Acid
selenites
selenite
anions
sorption
Anions
anion
Phosphates
phosphate
phosphates
penetration
mechanistic models
Adsorption
adsorption
Soil
effect
soil
experiment

Cite this

@article{b94d31def1044a62a7cbeef65b58273f,
title = "The effect of time on the competition between anions for sorption",
abstract = "Solutions of phosphate and of selenite were gently mixed with a soil, both separately and in combination, for periods ranging from 15 min to 30 days. For both anions, the solution concentration continued to decrease throughout the period, but the decrease was more marked for phosphate. Competitive effects were smallest after brief periods of mixing, and increased with time. Phosphate was a more effective competitor for sorption than selenite, and its competitive advantage increased with time. The observed effects were closely described by a mechanistic model. According to the model, competition was largely through changes in the electric potential of the surface rather than through decreases in the number of vacant adsorption sites. This explained why competition effects were initially small. This was especially so for phosphate, which was modelled as having a marked continuing diffusive penetration of the surface. The decrease in electric potential associated with that penetration decreased the surface concentration of selenite and so decreased the rate of penetration of selenite. By the end of the experiment this was the most important aspect of the competitive effect of phosphate on selenite.",
author = "BARROW, {N. J.}",
year = "1992",
month = "1",
day = "1",
doi = "10.1111/j.1365-2389.1992.tb00148.x",
language = "English",
volume = "43",
pages = "421--428",
journal = "Journal of Soil Science",
issn = "0022-4588",
publisher = "Blackwell",
number = "3",

}

The effect of time on the competition between anions for sorption. / BARROW, N. J.

In: Journal of Soil Science, Vol. 43, No. 3, 01.01.1992, p. 421-428.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The effect of time on the competition between anions for sorption

AU - BARROW, N. J.

PY - 1992/1/1

Y1 - 1992/1/1

N2 - Solutions of phosphate and of selenite were gently mixed with a soil, both separately and in combination, for periods ranging from 15 min to 30 days. For both anions, the solution concentration continued to decrease throughout the period, but the decrease was more marked for phosphate. Competitive effects were smallest after brief periods of mixing, and increased with time. Phosphate was a more effective competitor for sorption than selenite, and its competitive advantage increased with time. The observed effects were closely described by a mechanistic model. According to the model, competition was largely through changes in the electric potential of the surface rather than through decreases in the number of vacant adsorption sites. This explained why competition effects were initially small. This was especially so for phosphate, which was modelled as having a marked continuing diffusive penetration of the surface. The decrease in electric potential associated with that penetration decreased the surface concentration of selenite and so decreased the rate of penetration of selenite. By the end of the experiment this was the most important aspect of the competitive effect of phosphate on selenite.

AB - Solutions of phosphate and of selenite were gently mixed with a soil, both separately and in combination, for periods ranging from 15 min to 30 days. For both anions, the solution concentration continued to decrease throughout the period, but the decrease was more marked for phosphate. Competitive effects were smallest after brief periods of mixing, and increased with time. Phosphate was a more effective competitor for sorption than selenite, and its competitive advantage increased with time. The observed effects were closely described by a mechanistic model. According to the model, competition was largely through changes in the electric potential of the surface rather than through decreases in the number of vacant adsorption sites. This explained why competition effects were initially small. This was especially so for phosphate, which was modelled as having a marked continuing diffusive penetration of the surface. The decrease in electric potential associated with that penetration decreased the surface concentration of selenite and so decreased the rate of penetration of selenite. By the end of the experiment this was the most important aspect of the competitive effect of phosphate on selenite.

UR - http://www.scopus.com/inward/record.url?scp=0027064248&partnerID=8YFLogxK

U2 - 10.1111/j.1365-2389.1992.tb00148.x

DO - 10.1111/j.1365-2389.1992.tb00148.x

M3 - Article

VL - 43

SP - 421

EP - 428

JO - Journal of Soil Science

JF - Journal of Soil Science

SN - 0022-4588

IS - 3

ER -