Rinsgby et al (2024) appear to have done sorption measurements using the approach you outlined. Their Methods section and Supporting Info might have the experimental details you want. Good luck!

Ringsby, A. J., Ross, C. M., & Maher, K. (2024). Sorption of Soil Carbon Dioxide by Biochar and Engineered Porous Carbons. Environmental Science & Technology, 58(19), 8313–8325. https://doi.org/10.1021/acs.est.4c02015

Mutsa Muhambi

For an incubation experiment measuring the sorption capacity of biochar for CO₂, it is essential to ensure strict control of conditions to achieve accurate and reproducible results.

Key Aspects of the Experimental Protocol:

This experiment requires high precision in measurements, strict control of experimental conditions, and careful data analysis to accurately determine the sorption capacity of biochar for CO₂. Further research may include the effect of biochar surface chemistry, different activation levels, and interactions with other gases.