Accurate and Precise Measurement of Organic Carbon Content in Carbonate-Rich Soils

作者：Dhillon Gurbir Singh^*; Amichev Beyhan Y; De Freitas Renato; Van Rees Ken

来源：Communications in Soil Science and Plant Analysis, 2015, 46(21): 2707-2720.

DOI：10.1080/00103624.2015.1089271

• Carbon (C) analysis methods comparison
• HCl-acid fumigation of carbonaceous soils
• soil organic carbon (SOC)
• soil inorganic carbon (SIC)
• soil grinding effects on SOC measurement precision

Accurate measurement of soil organic carbon (SOC) is dependent on precise and fast methods for the separation of organic and inorganic carbon. The widely used methods involving thermal decomposition of soil samples at a specific temperature in an automated carbon (C) analyzer are susceptible to interference by carbonates and overestimation of organic C, and thus removal of carbonates by acid pretreatment of samples is recommended. Two carbonate-removal pretreatments including hydrochloric (HCl) acid addition and HCl fumigation are compared using the calcium carbonate (CaCO3) standard and soil samples of varying SOC contents. Both pretreatment methods provided similar measurements of organic C, indicating that both methods are efficient in removal of carbonates present in the soil. However, the HCl fumigation method exhibited greater accuracy and precision compared to the HCl addition method. Hence, SOC measurement procedure involving HCl fumigation as a pretreatment for the removal of carbonates is recommended for carbonate-rich soils.

• 出版日期2015-11-30
• 单位Saskatoon; Saskatchewan