Towards an autonomous microfluidic sensor for dissolved carbon dioxide determination

In this work, we present a new system for the determination of dissolved carbon dioxide (from 7.2ppm to 425.6ppm) in aqueous environments. Microfluidic technology has been incorporated in sensor design to reduce the volume of samples and reagents. Moreover, a detection system has been integrated in the chip, consisting of a white light-emitting diode as a light source and a high-resolution digital colour sensor as the detector, which are able to detect changes in colour produced by the reaction of the sensing chemistry and carbon dioxide in water.