Department of Agricultural Chemistry and Soil Science, Faculty of Agriculture, Calcutta University, Calcutta, West Bengal, 700 019
Light scattering measurements of humic and fulvic acid solutions were carried out after applying suitable corrections for colour and fluorescence. Zimm plots were constructed and both the number—and weight - average molecular weights were calculated therefrom. Light scattering has been found to be a reliable technique for estimating polydispersity of solutions of humic substances.
Light scattering, humic acid, fulvic acid, molecular weight, polydispersity
