Showing papers by "Robert L. Cook published in 1995"
TL;DR: The relationship between the extent of quenching and fraction of cation sites occupied is not linear as discussed by the authors, and it was also found that synchronous fluorescence is a more revealing measurement than emission.
Abstract: The quenching of fluorescence of a fulvic acid by metal ions has been revisited in this study. Fluorescence quenching has been used in the past to establish the extent of metal ion binding to fulvic acids. Both emission and synchronous fluorescence show that the relationship between the extent of quenching and fraction of cation sites occupied is not linear. It was also found that synchronous fluorescence is a more revealing measurement than emission. Similar patterns of components can be assigned from both time-resolved fluorescent measurements and synchronous fluorescence
50 citations
TL;DR: In this article, the ligand exchange kinetic speciation scheme developed in our laboratories is reviewed and its scope and limits identified, and tools such as laser thermal lensing, fluorescence probes, and combined high-performance liquid chromatography-ultrafiltration are evaluated.
Abstract: The systems under study are recognized as dynamic structures far from equilibrium and a dynamic analysis is recommended. A comparison is made of a kinetic speciation approach with the approach based on a local equilibrium approximation, which is commonly used. The ligand exchange kinetic speciation scheme developed in our laboratories is reviewed and its scope and limits identified. Tools such as laser thermal lensing, fluorescence probes, and combined high-performance liquid chromatography–ultrafiltration, which can be used in kinetic speciation, are evaluated.
41 citations