title: Acid-base properties of water-soluble organic matter of forest soils, studied by the pK-spectroscopy method.
abstract: Using the potentiometric titration and pK spectroscopy method, acid-base properties of water-soluble organic matter of forest soils have been studied. Five acidic classes composed of different substances with pK(a) values around 3.6; 4.8; 6.7; 8.7 and 9.7 have been identified. Testing the properties of soluble soil fraction, it is to be taken into account that when it is isolated from non-soluble soil matter, some water-soluble substances remain in soil and do not pass into the solution. Most firmly adsorbed in soil are water-soluble components with pK(a) 9.6-9.8.
authors: Institute of Biology, Komi Science Centre of Russian Academy of Sciences, 28 Kommunisticheskaya St, Syktyvkar, Russia. shamrik@ib.komisc.ru
authors: E V
authors: EV
authors: Shamrikova
authors: M A
authors: MA
authors: Ryazanov
authors: E V
authors: EV
authors: Vanchikova