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1	EFFECT OF pH ON THE RELEASE OF ORGANIC MATTER FROM MUCKS // Tomsk State Pedagogical University Bulletin. 2009. Issue 3 (81). P. 105-109 The effect of high pH values on the release of organic matter (OM) from mucks was investigated. This study was conducted on homoionic hydrogen forms of 7 mucks (Terric Histosols). Concentration of dissolved organic matter (DOM) released were determined colorimetrically at l=465 nm. Parameters Q2/6 and Q4/6 were calculated from spectra in visible region. The dissolution of soil OM was significantly affected by pH. The relationship could be satisfactorily described by the equation: DOM = 0.01Чexp(b1ЧpH). The b1 parameter quantified the DOM release process in relation to the changes in soil pH. The investigations proved correlations among W1, Q and b1 indexes. Keywords: dissolved organic matter (DOM), mucks, pH, state of secondary transformation	1499

EFFECT OF pH ON THE RELEASE OF ORGANIC MATTER FROM MUCKS // Tomsk State Pedagogical University Bulletin. 2009. Issue 3 (81). P. 105-109

The effect of high pH values on the release of organic matter (OM) from mucks was investigated. This study was conducted on homoionic hydrogen forms of 7 mucks (Terric Histosols). Concentration of dissolved organic matter (DOM) released were determined colorimetrically at l=465 nm. Parameters Q2/6 and Q4/6 were calculated from spectra in visible region. The dissolution of soil OM was significantly affected by pH. The relationship could be satisfactorily described by the equation: DOM = 0.01Чexp(b1ЧpH). The b1 parameter quantified the DOM release process in relation to the changes in soil pH. The investigations proved correlations among W1, Q and b1 indexes.

Keywords: dissolved organic matter (DOM), mucks, pH, state of secondary transformation

1499

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