Xie et al. (2024): Methods for quantification of biochar in soils: A critical review
Yanhai Xie, Caibin Li, Hanbo Chen, Yurong Gao, Tony Vancov, Brad Keen, Lukas Van Zwieten, Yunying Fang, Xiwen Sun, Yi He, Xiaofei Li, Nanthi Bolan, Xing Yang, Hailong Wang IN: CATENA 241, 108082, https://doi.org/10.1016/j.catena.2024.108082
Accurate quantification of stable fractions of biochar from soil is vital to assessing its long-term C storage potential for accounting purposes. However, methods specifically developed for quantifying biochar in soils are limited with most current methods adapted from techniques for measuring black carbon. This results in numerous drawbacks for the quantification of biochar. Drawing on existing techniques for determining black carbon, the potential biochar quantification methods are identified and ordered into four categories: thermal oxidation methods, chemical oxidation methods, benzene poly-carboxylic acids molecular marker methods, and optical methods.