title: Differential scanning potentiometry: surface charge development and apparent dissociation constants of natural humic acids.
abstract: Humic acids (HA) are the main components of soil organic matter which can form complexes with metal ions and other soil and/or water contaminants. Here, we focus on their acid-base properties. HA were extracted from two different soils (Tipic Ustifluvent and Entic Haplustoll) with different vegetation. In this study we use a simple method, differential scanning potentiometry (DSP), to determine HA buffer capacity distribution, apparent dissociation constant values and surface charge development.
authors.affiliation: Depto. de Recursos Naturales, Facultad de Ciencias Agropecuarias, Universidad Nacional de Córdoba, CC 509, 5000 Córdoba, Argentina.
authors.forename: S B
authors.initials: SB
authors.lastname: Ceppi
authors.forename: M I
authors.initials: MI
authors.lastname: Velasco
authors.forename: C P
authors.initials: CP
authors.lastname: De Pauli