Solubility of the pesticide monuron in organic nonelectrolyte solvents. Comparison of observed versus predicted values based upon mobile order theory

摘要

Experimental solubilities are reported at 25.0 ℃ for monuron (also called 3-(4-chlorophenyl)-1,1-dimethyl urea) dissolved in 18 different organic nonelectrolyte solvents containing ether-, chloro-, hydroxy-, ester methyl- and t-butyl-functional groups. Results of these measurements, combined with published literature data, are used to test the applications and limitations of expressions derived from Mobile Order theory. For the 21 nonalcoholic solvents for which predictions could be made computations show that Mobile Order theory does provide fairly reasonable estimates of the saturation mole fraction solubilities. Average absolute deviation between predicted and observed values is 48.4%. Monuron solubilities in the alcohol solvents are used to calculate stability constants for presumed solute-solvent hydrogen bonds that are believed to occur in solution.