Physico-chemical and biological properties of atrazine in soils
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Date
1993
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Sokoine University of Agriculture
Abstract
The physico-chemical and biological properties of atrazine (2-chloro-4-
ethylamino-6-isopropylamino-s-triazine) in soils were
laboratory.
investigated in the
The batch suspension method was used to study the adsorption
desorption properties of atrazine. The results revealed that the amount of atrazine
adsorbed or desorbed varies with the soil properties. The adsorption data fitted the
Freundlich model. Freundlich "K" values describing the adsorptive capacities of
the soils varied with the inherent soil properties.
Over 70% of the adsorbed
atrazine was found to be desorbed after five desorption cycles. Microbial numbers
were determined by dilution plate count technique, and the microbial processes by
measuring the final products of the transformations carried out by the test
organisms. All the test organisms in this study (i.e total bacteria, Azotobacter,
Beijerinckia and nitrifiers) were tolerant to atrazine at the concentrations tested.
The population and the activities of these organisms were only slightly and
temporarily affected. The practical implications of these findings are discussed.
Description
Masters' Theses
Keywords
Physico-chemical properties, Biological properties, Soil