Adsorption of the nitrification inhibitors nitrapyrin and dicyandiamide by soil humic substances

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dc.contributor.advisor Pichtel, John, 1957- en_US Jacinthe, Pierre-Andre en_US 2011-06-03T19:35:31Z 2011-06-03T19:35:31Z 1990 en_US 1990
dc.identifier LD2489.Z78 1990 .J3 en_US
dc.description.abstract Adsorption of the nitrification inhibitors dicyandiamide (DCD) and nitrapyrin (2-chloro-6(trichloromethyl)-pyridine) on humic acid (HA) and fulvic acid (FA) extracted from five Indiana soils was studied. Ten mg of HA or FA were suspended in aqueous solutions (10 ml) of either DCD (5,10, 20, 40 and 80 ug ml-1) or nitrapyrin (2,4,6,8,12 ug ml-1). The amount of nitrification inhibitor absorbed was evaluated after shaking the suspension of DCD for 48 h or nitrapyrin for 24 h. Infrared spectra of the nitrification inhibitor-humic material complexes were recorded. The results indicated that FA adsorbed more DCD than HA, and HA was a better adsorbent for nitrapyrin. Correlation between Freundlich K values and organic carbon content of HA and FA was not statistically significant, indicating a slight contribution of hydrophobic forces in the adsorption of DCD and nitrapyrin. The infrared spectra provided evidence that adsorption occurred predominantly through an ionic bonding mechanism involving the protonated amino group of DCD or the nitrogen of the pyridine ring of nitrapyrin and the negative functional groups of the humic materials.
dc.description.sponsorship Department of Natural Resources
dc.format.extent 83 leaves : ill. ; 28 cm. en_US
dc.source Virtual Press en_US
dc.subject.lcsh Soil absorption and adsorption. en_US
dc.subject.lcsh Nitrification inhibitors. en_US
dc.title Adsorption of the nitrification inhibitors nitrapyrin and dicyandiamide by soil humic substances en_US Thesis (M.S.)
dc.identifier.cardcat-url en_US

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  • Master's Theses [5318]
    Master's theses submitted to the Graduate School by Ball State University master's degree candidates in partial fulfillment of degree requirements.

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