“…The presence of hydrocarbons affects the selectivity of CO 2 and can cause measurement error. Bhatia and Risk used a hydrochemical modeling software to comprehensively evaluate the performance of fiber optical CO 2 sensors in fresh water, saltwater, and transitional environments. Results showed that saline, transitional (estuary), and deep freshwater environments have the widest range of carbonate distribution and also contain species that interfere.…”