Answers are grounded in this paper and cite their sources.
The fluorescence of a well-characterized fulvic acid is found to be quenched by the binding of Cu(II), Mn(II) or H+. Below 40% protonation of the 5.0 mmole/g most strongly acidic carboxyl groups, the results indicate weak collisional quenching by OH−. Metal ion complexing becomes weaker with increasing amounts bound.
No takes yet. Share an insight, caveat, or question.
Underdown et al. (1981) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: