Mass balance model to quantify atrazine sources, transformation rates, and trends in the Great Lakes

Article Abstract:

The fate and sources of atrazine in the Great Lakes can be determined using a dynamic mass balance model. The effectivity of the model depends upon the use of given inputs and losses and the manipulation of independent variables to match model results with measured concentrations. The model has effectively shown that the internal transformation of atrazine is a constant occurrence in the Great Lakes, with Lake Michigan, Huron and Ontario yielding similar transformation rates that ranges from 0.05 to 0.075 yr-1.

Research and Development in the Physical, Engineering, and Life Sciences, Water Pollution Control R&D, Models, Water pollution research, Lake Michigan, Great Lakes (North America), Lake Erie, Lake Ontario, Lake Huron, Water quality bioassay

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Degradation of atrazine by Fenton's reagent: condition optimization and product quantification

Article Abstract:

The influence of different reaction conditions on the effectiveness of Fenton's reagent in degrading atrazine was investigated. Optimal degradation was observed with 2.69 mM (1:1) FeSO4:H2O. At this level, atrazine was completely degraded to 2-chloro-4,6-diamino-s-triazine and 2-acetamido-4-amino-6-chloro-s-triazine in less than or equal to 30 seconds. This indicated that additional post-treatments may be needed to eliminate residual chloro-s-triazines.

Chemical tests and reagents, Reagents

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Paramagnetic relaxation of atrazine solubilized by humic micellar solutions

Article Abstract:

Concentrated solutions of humic acid molecules form micellar aggregates that are capable of solubilizing atrazine, a neutral organic compound. The tendency of humic acid molecules to form micellar aggregates with hydrophobic interiors does not allow paramagnetic relaxation with hydrophilic anionic paramagnetic probes.

Micelles

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