In acid soils, where organic carbon (C) corresponds to total C, direct determination of organic C by dry combustion is possible, whereas in soils with carbonates also a separate measurement of inorganic C is required. In this case, direct quantification of organic C can be accomplished by the Walkley-Black method, which is time-consuming and involves greatly polluting by-products. Hence, a method able to determine directly organic C by dry combustion is strongly needed for soils with carbonates. This study proposes such a method, after it was found to be highly reliable in calcareous soils of a Mediterranean island. The correction factor to use in the Walkley-Black method to account for nonrecoverable C was calculated. It does not show any overall relationship with the contents of either organic C or inorganic C, and for all land uses examined in the island, it is not significantly different from the commonly suggested value 1.30.
Direct determination of organic carbon by dry combustion in soils with carbonates / G. CERTINI; C. SANTI; LP. D'ACQUI. - In: COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS. - ISSN 0010-3624. - STAMPA. - 37:(2006), pp. 155-162. [10.1080/00103620500403531]
Direct determination of organic carbon by dry combustion in soils with carbonates
CERTINI, GIACOMO;
2006
Abstract
In acid soils, where organic carbon (C) corresponds to total C, direct determination of organic C by dry combustion is possible, whereas in soils with carbonates also a separate measurement of inorganic C is required. In this case, direct quantification of organic C can be accomplished by the Walkley-Black method, which is time-consuming and involves greatly polluting by-products. Hence, a method able to determine directly organic C by dry combustion is strongly needed for soils with carbonates. This study proposes such a method, after it was found to be highly reliable in calcareous soils of a Mediterranean island. The correction factor to use in the Walkley-Black method to account for nonrecoverable C was calculated. It does not show any overall relationship with the contents of either organic C or inorganic C, and for all land uses examined in the island, it is not significantly different from the commonly suggested value 1.30.File | Dimensione | Formato | |
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