Abstract
The or ganic matter of Irish peat of Sphagnum was extracted with 0.1 M NaOH and separated into humic (HA) and fulvic (FA) acids. Afterwards, HA and FA fractions were obtained at different nominal molecular weight using a tangential ultr a- filtration system. The behaviour of such fractions has been studied both in acid and alkaline solutions. Solutions at dif ferent ionic strength ha ve been titrated under different conditions and the resulting cur ves have been elaborated through a computer program based on a bimodal Gaussian distribution. The typical parameters (pKA mean value and dispersion degree) of the two main groups of HA and FA acidic functionalities have been determined.
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