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Environmental fate & pathways

Biodegradation in soil

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Three Saskatchewan soils (clay from Indian Head, clay from Regina, and loamy sand from White City) were used to detect the degradation of dimethylamine under laboratory conditions (20 °C, [14C]-label, 0.5 -100 µg/g). The soils were collected from the 5 cm top horizon. After allowing to reach soil equilibrium in the laboratory jars, dimethylamine was added in concentrations of 0.5, 10, 50, and 100 µg. After 7 days incubation time the levels of radioactivity into to soil microbial biomass were determined using a chloroform fumigation-incubation technique. At all concentrations there was a very rapid release of the labeled substance as [14C]carbon dioxide with over 40 % of the applied with over 40 % of the applied 14C being so released after 2 days and 69 - 89 % after 7 days. The percentage of the applied radioactivity incorporated into the soil biomass for 7 days with 0.5, 10, and 100 µg/g [14C]dimethylamine ranged from 10 - 16 %. It can be concluded that in agricultural soils there will be rapid metabolism of dimethylamine resulting from application of herbicide formulations with no likelihood of any buildup of residues.