Researchers have traditionally viewed sorption, degradation and transport as separate processes and only recently have these processes viewed as coupled. 2,4-D was chosen as a model system to study the interaction between these processes. A series of laboratory batch and column experiments with a sandy loam soil were conducted to determine the relative contributions of sorption and degradation to transport of 2,4-D under both saturated and unsaturated conditions. The sorption contribution to 2,4-D transport was not significant under saturated (Kd = 0.249 mg/g) nor unsaturated conditions (Kd = 0.566 mg/g). Degradation however, was very significant, specially under unsaturated conditions where the estimated first order biodegradation rate (μ) constant was 4.39 d-1. Rate constants under the saturated transport experiment were restricted by oxygen limitations. There was an order of magnitude difference between μ of batch and column experiments which were attributed to differences in aeration and mixing conditions.
| Identifer | oai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/278212 |
| Date | January 1992 |
| Creators | Estrella Sanchez, Maria del Rocio, 1962- |
| Contributors | Miller, Raina M. |
| Publisher | The University of Arizona. |
| Source Sets | University of Arizona |
| Language | en_US |
| Detected Language | English |
| Type | text, Thesis-Reproduction (electronic) |
| Rights | Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author. |
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