NDLI: Simultaneous measurement of soil organic and inorganic carbon: evaluation of a thermal gradient analysis

Content Provider	Springer Nature Link
Author	Vuong, Truong Xuan Heitkamp, Felix Jungkunst, Hermann F. Reimer, Andreas Gerold, Gerhard
Copyright Year	2013
Abstract	The best method for determining soil organic carbon (SOC) in carbonate-containing samples is still open to debate. The objective of this work was to evaluate a thermal gradient method (ThG), which can determine simultaneously inorganic carbon (SIC) and SOC in a wide range of soil samples.The determination of SOC by ThG (SOC$_{ThG}$) was compared to the following widespread standard methods: (1) acidification (ACI) as pretreatment and subsequent dry combustion (SOC$_{ACI}$) and (2) volumetric quantification of SIC by a calcimeter (CALC) and subtraction of the total carbon content as determined by dry combustion (SOC$_{CALC}$). Precision (F test) and bias (t test) were tested on a subset of seven samples (n = 3). Comparison of the ThG and CALC methods was performed by regression analysis (n = 76) on samples representing a wide range of SOC (5.5 to 212.0 g kg$^{−1}$) and SIC (0 to 59.2 g kg$^{−1}$) contents.Tests on the replicated subset showed that the precision of ThG was not significantly different from ACI or CALC (F values < 39, n = 3) for SOC and SIC measurements. However, SOC$_{ACI}$ and SOC$_{CALC}$ contents were systematically and significantly lower compared to SOC$_{ThG}$ contents. The positive bias for SOC$_{ThG}$ relative to SOC$_{CALC}$ contents appeared also in the regression analysis (given numbers ± standard errors) of the whole data set (y = (4.67 ± 0.70) + (0.99 ± 0.01)x, R $^{2}$ = 0.99, n = 76). When performing a regression with carbonate-free samples, the bias between the methods was negative (−2.90 ± 0.63, n = 29) but was positive in the set with carbonate-containing samples (3.95 ± 1.41, n = 47). This observation corroborated the suspicion that the use of acid for carbonate decomposition can lead to an underestimation of SOC.All methods were suitable for differentiation between SIC and SOC, but the use of acid resulted in lower estimates of SOC contents. When comparing soil samples with different carbonate concentrations, the use of the ThG method is more reliable.
Starting Page	1133
Ending Page	1140
Page Count	8
File Format	PDF
ISSN	14390108
Journal	Journal of Soils and Sediments
Volume Number	13
Issue Number	7
e-ISSN	16147480
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-05-15
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Calcimeter Carbonate Dry combustion Soil carbon Thermal gradient analysis Soil Science & Conservation Environment Environmental Physics
Content Type	Text
Resource Type	Article
Subject	Stratigraphy Earth-Surface Processes

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