Determination of Calcite and Dolomite Content in Soils and Paleosols by Continuous Coulometric Titration
Determination of Calcite and Dolomite Content in Soils and Paleosols by Continuous Coulometric Titration
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DOI：
10.2136/sssaj2011.0278
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发表时间：
2012-05-01
影响因子：
2.9
通讯作者：
Hasiotis, Stephen T.
中科院分区：
文献类型：
--
作者：
Hirmas, Daniel R.;Platt, Brian F.;Hasiotis, Stephen T.
土壤碳酸盐组分中方解石/白云石比值的定量测定对于了解土壤或古土壤的成土历史具有重要意义。这是特别相关的稳定的碳酸盐碳和氧同位素分析的碳酸盐馏分中的白云石的存在下，可能会导致错误的结果和不准确的古环境的解释。这项工作的目的是开发和测试一种准确的方法，使用库仑滴定结合微分动力学原理，用于确定样品中的方解石和白云石分数。将自动滴定仪连接到温度控制的碳酸盐反应器，其中将2 M HClO 4引入样品中，并通过以100 ml/min（-1）的恒定速率鼓泡无CO2空气进行混合。将样品研磨至
Quantitative determination of calcite/dolomite ratios in soil carbonate fractions is important for understanding the pedogenic history of a soil or paleosol. This is particularly relevant to stable carbonate-carbon and -oxygen isotope analyses where the presence of dolomite in a carbonate fraction can lead to erroneous results and inaccurate interpretations of the paleoenvironment. The goal of this work was to develop and test an accurate method using coulometric titration combined with differential kinetic principles for determining calcite and dolomite fractions in a sample. An automated titrator was connected to a temperature-controlled carbonate reactor where 2 M HClO4 was introduced to the sample and mixed by bubbling CO2-free air at a constant rate of 100 ml min(-1). Samples were ground to