Humic acids are ubiquitous material of soil organic matter. Promising structural and chemical features of this material are commendable in the field of soil science. The properties involved with cation exchange capacity, buffering capacity and soil structural stability are the major components of research interest on this material. This study focused the structural and chemical property elucidation of the humic acid extracts from moist deciduous forests of different agro-ecological zones of Kerala western ghats. The sorption capacity of the humic acid extracts were studied using methylene blue dye. The finding supported the enhancement of percentage of adsorption with respect to the temperature and the cation exchange capacity of the humic acid extract. Higher temperature favoured the enhancement in the percentage of adsorption .