The new method of determination of the quantity and quality of primary soil organic matter and humus

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12220%2F16%3A43891843" target="_blank" >RIV/60076658:12220/16:43891843 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

The new method of determination of the quantity and quality of primary soil organic matter and humus

Original language description

Currently, it is common to determine the total organic carbon in soils, which reflects the total amount of humified, as well as non-humified soil organic matter. Then, soil organic matter is usually divided into fractions according to the degree of stability during hydrolysis or oxidation. The humus content in soil organic matter is described as the humification degree (SH), i.e. the amount of carbon of fulvic acids (FA) and humic acids (HA) in the total organic carbon of the soil sample expressed as a percentage. Humus quality is assessed by the ratio of CHA:CFA. Our proposed method is based on the gradual oxidation of soil sample using a 0,07 M K2Cr2O7 solution in 12 M H2SO4 at 60 oC. The rate constant of this reaction can be determined by the reaction kinetics of combustion of soil organic matter (carbon loss) in soil samples, which is a degree of quality of primary (non-humified) soil organic matter. The higher the value is, the less stabile this fraction is and hence of a better quality. Humus is so stabile under these conditions that it does not participate in the oxidation reaction. The amount of primary soil organic matter is given by the total carbon content resulting from this oxidation, which is completed by raising the temperature to 100 oC for 45 minutes, when stabile primary fractions of soil organic matter oxidize but humus does not. The carbon content is labelled as C1. The amount of humus is given by total carbon content of the soil sample, which is labelled as C2 and determined by the oxidation of 0,27 M K2Cr2O7 in concentrated H2SO4 at 135 oC for 30 minutes according to ISO DIS 14235. The amount of carbon corresponding to humus may be obtained by subtraction C1 from C2. Humus quality may be assessed by its cation-exchange capacity (CEC), determined by the conductometric titration of the soil sample in the H+-cycle with Ba(OH)2. CEC may be calculated as CEC of the soil sample, whose total organic matter has been oxidized using 15% H2O2 in CH3COOH.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

DF - Pedology

OECD FORD branch

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Project

<a href="/en/project/QJ1630422" target="_blank" >QJ1630422: Soil protection through optimization of spatial and functional parameters of the elements of landscape structure in the process of Land Consolidation</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Proceedings from International Conference Soil - the non-renewable environmental resource

ISBN

978-80-7509-413-1

ISSN

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e-ISSN

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Number of pages

8

Pages from-to

135-142

Publisher name

Mendelova univerzita v Brně

Place of publication

Brno

Event location

Brno

Event date

Sep 7, 2015

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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