Sensitive layer based on Lophine and calcium hydroxide for detection of dissolved oxygen in water

In this paper, we present a new sensitive layer to detect dissolved oxygen in pure water. The sensitive layer was elaborated with Lophine and calcium hydroxide. It has identified two forms of measurement: (a) the magnitude of optical absorbance, and (b) the bathochromic shift of the absorption peak according to dissolved oxygen. The magnitude of the absorbance was related to the dissolved oxygen concentration in pure water successfully, and it was observed in the wavelength range from 400 to 1100 nm. This result allowed the measurement by using a photodetector for measuring the optical power as a function of dissolved oxygen. It was found that the sensitive layer had a peak absorption around 319 nm, and the bathochromic shift was 24 nm. The response and recovery time was 87 ms and 89 ms respectively, which is an advantage over conventional methods used so far.