Measurement of complexation properties of metal ions in natural conditions by ultrafiltration: measurement of equilibrium constants for complexation of zinc by synthetic and natural ligands

Journal Article · Sat Dec 01 00:00:00 EST 1984 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00278a047· OSTI ID:5617434

Buffle, J; Staub, C

A new ultrafiltration method is described to measure complexation properties (stability constants) of trace metal ions with natural aquatic ligands. The determination of stability constants is described theoretically and the best operational conditions are discussed theoretically and experimentally. Theory is tested with Zn, known synthetic ligands, and pedogenic fulvic acids of natural waters. The results obtained by this method compare well with the literature data. In particular, for natural mixture of complexing sites like fulvic acids, this method permits the determination of the detailed equilibrium function to be carried out instead of its average value, over a given range of metal to ligand ratio. The most important advantages of this method are the fact that there is no limitation with regard to the nature of metal ions and little for that of the ligands.

• Research Organization: Univ. of Geneva, Switzerland
• OSTI ID: 5617434
• Journal Information: Anal. Chem.; (United States), Vol. 56:14
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ZINC
ULTRAFILTRATION
COMPLEXOMETRY
EQUILIBRIUM
EXPERIMENTAL DATA
FULVIC ACIDS
LIGANDS
MEMBRANES
STABILITY
THERMODYNAMIC PROPERTIES
TRACE AMOUNTS
WATER
DATA
ELEMENTS
FILTRATION
HYDROGEN COMPOUNDS
INFORMATION
METALS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SEPARATION PROCESSES
400201* - Chemical & Physicochemical Properties
400105 - Separation Procedures