Towards an autonomous microfluidic sensor for dissolved carbon dioxide determination

The optimised parameters found for the system are: flow rate 0.6 mL·min−1, integration time 30 s and the time for pumping of solutions was 3 min, obtaining a LOD of 7.2 ppm. The CO2 response, reproducibility, precision, and stability of the sensing chemistry have been studied and compared with those obtained using bench-top instrumentation (i.e. a spectrophotometer), obtaining good agreement.