The objective of this study was to compare the results of calcimetric and dry combustion methods for quantitative estimation of soil total inorganic carbon (TIC). To this aim, 117 soil samples from three localities in the Mediterranean area (one in Spain and two in Southern Italy), representing a wide range of total inorganic carbon contents (ranging from 1.9 to 54 g 100g⁻¹), were collected. TIC (expressed as CaCO₃) was quantified using the volumetric calcimeter method, as reference, and dry combustion in order to find an accurate and rapid method, suitable for different types of soils. The results revealed a concordance between the two methods compared, as shown by the recovery values close to one, for the whole data set and for data grouped per experimental site. Specifically, the dry combustion method showed slightly greater values of TIC compared to volumetric method, probably due to soil acid pretreatments, in dry combustion, and to an incomplete decomposition of carbonates that would require more time for removal, in a calcimeter method. Linear regression equations between the two methods were not affected by different soil types. Overall, our study demonstrated that the dry combustion was a reliable method and could provide accurate estimates of TIC in soils with different calcium carbonate content.

中文翻译：

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地中海地区三种土壤类型总无机碳估算方法的两种比较

这项研究的目的是比较钙法和干法燃烧方法的结果，以定量估算土壤中的总无机碳（TIC）。为此目的，收集了来自地中海地区三个地区（西班牙一个，意大利南部两个）的117个土壤样品，这些样品代表了广泛的总无机碳含量（范围从1.9到54 g 100g ^-1）。TIC（表示为CaCO ₃）使用体积钙计法（作为参考）进行定量，并进行干式燃烧，以找到适用于不同类型土壤的准确而快速的方法。结果表明，对于整个数据集和每个实验站点分组的数据，所比较的两种方法之间具有一致性，如恢复值接近一所示。具体而言，与体积法相比，干法燃烧显示出的TIC值稍高，这可能是由于在干法燃烧中对土壤酸进行了预处理，以及由于钙测定法中碳酸盐的不完全分解需要更多的时间才能去除。两种方法之间的线性回归方程不受不同土壤类型的影响。全面的，