Aggregation studies of humic acid using multiangle laser light scattering

An aqueous phase study of the naturally occurring dissolved organic carbon humic acid HA. is performed using multiangle laser light scattering MALLS. to measure its RMS radius and average molecular weight. A Zimm plot using Berry Formulism and a second-order fit gave an average molar mass of 1.164=108 grmol and an average RMS radius Rz. of 436.0"36 nm at 258C.