title: Binding of inorganic phosphate to dissolved metal humates.
abstract: A cobalt-wire electrode was used to determine the concentration of free phosphate (P) in solutions containing a series of metal humates (MHA). The results were used in Scatchard plots to determine the stability constants of the dissolved MHA-P complexes formed. The constants were found to be high, with logK values in the range 4.8-6.0. Solutions containing MHA-P complexes were found to be relatively inert to the addition of phosphate-precipitating cations, indicating that MHA has a solubilizing effect on P and may enhance its mobility in the environment.
authors.affiliation: Department of Chemistry, University of Idaho, Moscow, ID 83844-2343, USA.
authors.forename: Jeremy
authors.initials: J
authors.lastname: Riggle
authors.forename: Ray
authors.initials: R
authors.lastname: von Wandruszka