Department of Agricultural Chemistry and Soil Science, Faculty of Agriculture, Calcutta University, Calcutta, West Bengal, 700019
Fluorescence excitation spectra of two humic acid samples of diverse origin were noted in a number of nonaqueous solvents. The formation of solute-solvent hydrogen bond is evidenced, and the data suggest that the fluorophore is aromatic in nature.
Fluorescence excitation spectra, humic acid, solute-solvent hydrogen bond
