Adsorption of atrazine and phosphate as affected by soil depth in allophanic and non-allophanic soils

G. N. Magesan, N. S. Bolan, R. Lee

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Quantification of soil processes, such as adsorption, is needed for predicting the fate of agricultural chemicals in soils. Adsorption is affected by soil properties, which vary with depth. We conducted a laboratory study to determine the influence of soil depth on the adsorption of an organic solute (atrazine) in both allophanic and non-allophanic soils, and an inorganic solute (phosphate) in two non-allophanic soils. Adsorption isotherms of atrazine and phosphate were determined using 14C-labelled atrazine and KH2PO4, respectively, in batch equilibrium. The adsorption isotherms for atrazine were almost linear, and adequately described by the Freundlich equation. For phosphate the adsorption isotherms exhibited substantially more curvature and were best described by the Langmuir equation for one of the soils. Generally, adsorption of both solutes decreased with depth. While atrazine adsorption appeared related to such factors as percentage clay content, total C, cation exchange capacity (CEC), and surface area, no similar relationships appeared apparent for phosphate adsorption.

Original languageEnglish
Pages (from-to)155-163
Number of pages9
JournalNew Zealand Journal of Agricultural Research
Volume46
Issue number2
DOIs
Publication statusPublished - 2003
Externally publishedYes

Fingerprint

Dive into the research topics of 'Adsorption of atrazine and phosphate as affected by soil depth in allophanic and non-allophanic soils'. Together they form a unique fingerprint.

Cite this