Written Paper

Physico-chemical properties of humic acids isolated from an Eriophorum-Sphagnum raised bog  [2010]

Gierlach-Hladon, T., Karol Marcinkowski Univ. of Medical Sciences, Poznan (Poland). Dept. of Inorganic and Analytical Chemistry Szajdak, L., Polish Academy of Sciences, Poznan (Poland). Inst. for Agricultural and Forest Environment

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Humic acids (HA) isolated from an Eriophorum-Spagnum raised bog have been investigated using X-ray diffraction, FT-IR spectroscopty, 13C NMR, and the differential scanning calorimetric method. Peat from Eriophorum-Sphagnum raised bogs is commonly utilized for balneological purposes. The size of the HA molecules isolated from the raised bog ranged from 0.05 to 477.01 μm. The smallest percentage of particles equaled 0.1% and pertained to the size range of 0.05 to 0.11 μm. The largest percentage of particles equaled 45.6% and pertained to the size range of 120.67 to 477.012 μm. An increase of the proportion of different size particles with an increase of the size range was observed. The study revealed small values of surface area of HA, and the total pore volume and pore diameter calculated on the basis of BET adsorption isotherm were estimated. It was discovered that ion exchange capacity of peat depends mainly on HA. It was shown that the sorption capacity of peat is determined by the sorption capacity of HA.