Kinetics and Adsorption-Desorption Behavior of AM Nitrification Inhibitor in Mollisols |
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| Authors: | K S Rawat S C Bhatt S P Pachauri P C Srivastava |
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| Institution: | 1. Department of Chemistry, College of Basic Science Humanities, Govind Ballabh Pant University of Agriculture &2. Technology, Pantnagar, Uttarakhand, India;3. Department of Soil Science, College of Agriculture, Govind Ballabh Pant University of Agriculture & |
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| Abstract: | Kinetics and adsorption-desorption behavior of a potent nitrification inhibitor, 2-amino 4-chloro 6-methyl pyrimidine (AM), was examined in Mollisol samples of different depths. Adsorption of AM was better accounted by pseudo-second order kinetics. Adsorption and desorption data of AM onto soil samples of different depths conformed to single surface Freundlich isotherm model. The values of ln K varied from ?0.1515 (0–15 cm) to 1.5171 (45–60 cm) and of 1/n from 0.9961 (45–60 cm) to 1.3237 (30–45 cm). Computed values of desorption capacity (ln K’) varied from 3.4734 (0–15 cm) to 4.0674 (45–60 cm) while that of 1/n´ from 0.0017 (45–60 cm) to 0.0367 (0–15 cm). Intensity of desorption (1/n´) had significant positive correlation with soil electrical conductance and clay content. The values of desorption index (n´/n) varied from 14.60 (0–15 cm) to 472.33 (30–45 cm) indicating high degree of irreversibility of adsorbed AM and hence poor leaching from these soils. |
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| Keywords: | Adsorption-desorption HPLC mollisol nitrification inhibitor pseudo-second order kinetics QuEChER’s method |
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