A paper on a spectroscopic system that can measure the weight of carbonate at 0.1 µg has been published.
Sakai S, Otsuka T, Matsuda S, Sakairi Y, Uchida R, Sugahara K, Kano A, Yang, D., Sub-nanomolar sensitive stable isotopic determination in CO2 by tunable infrared laser absorption spectroscopy. Analytical Chemistry, https://doi.org/10.1021/acs.analchem.1c05458, 2022.
