MOLECULAR SIZE DISTRIBUTION OF HUMIC ACIDS EXTRACTED FROM WATER STABLE AGGREGATES OF DIFFERENT SIZES

摘要

Humic Acids (HA) extracted by 0.1 M NaOH-pyrophosphate mixture from water stable aggregates of different sizes (0.25, 0.5, 1.0, 2.0 mm) were fractionated using Sephadex gels into molecules of different size ranges. It was observed that smaller sized aggre