While natural organic matter and specifically humic acids (HA) have been studied extensively, the aggregation of these materials in solution is not well understood. In this study, the effects of time, concentration, and filtration (through a 0.45 micron Millipore filter) were examined by monitoring changes in zeta potential and dynamic light scattering. The effects of concentration were studied at 2, 5, 8, 45, 100, 250, and 500 ppm.  At lower concentrations of HA higher variation of aggregation size was observed compared to higher concentration.  Zeta potential decreased�became more negative�as concentration increased.  The data generated in this research will be compared with other studies of HA aggregation.

Investigation of humic acid aggregation by zeta potential and dynamic light scattering

245th National Meeting (2013)

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