In former soviet union countries 0.1 M NaOH is widely used to determine labile humic substances. But I have found only few articles about its usage in another countries. Is this method known?
Tetyana,
Here is a paper on just that subject that we did using radiolabelled leaf litter. The 0.1 M NaOH dissolves a mixture of both labile and refractory organic matter. If you precipitate the humic acid and measure the carbon in that fraction, it would give you the most refractory fraction. The NaOH insoluble residue is likely to be the most labile. The fulvic acid fraction would be intermediate.
Robert Qualls
Article Biodegradability of Humic Substances and Other Fractions of ...
Please see this article (available on line)
Claudivan Costa LimaI; Eduardo de Sá MendonçaII; Asunción RoigI
Contribution of humic substances from different composts to the synthesis of humin in a tropical soil. Rev. Bras. Ciênc. Solo vol.34 no.4 Viçosa July/Aug. 2010
http://dx.doi.org/10.1590/S0100-06832010000400004
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