The dependence of the aqueous conformation of a soil-derived fulvic acid on the independent parameters specifying the solution composition has been studied by time-dependent fluorescence depolarization spectroscopy. The molecular size and shape of the fluorescent components in fulvic acid were found to vary with solution pH, ionic strength, and sample concentration. These results indicate that this material behaves like a flexible polyelectrolyte in solutions approximating naturally occurring concentrations.
ASJC Scopus subject areas
- Analytical Chemistry