A Model System for the Investigation of Methods of Herbicide Speciation
Organic chemicals in the aquatic environment may exist in a number of chemical forms; for example, the chemical may be in true solution, adsorbed onto inorganic colloids (Haque, 1975), associated with soluble and particulate humic substance (Haque, 1975), dissolved in lipid coatings on particulates (Hartung, 1975; Hance, 1969), and incorporated into the biotic material. The relative distribution of an organic chemical among the different forms will depend on the properties of the compounds (charge, polar functional groups, size etc.), the composition of the particulates, and the ultimate relationship between chemical speciation and bioavailability.
KeywordsHumic Substance Humic Acid Methylene Blue Cation Exchange Capacity Clay Suspension
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