Aquation’s pHalkon monitors pH using a fluorescence-based technique. Excitation light and fluorescence emission are conveyed through a fibre optical cable within the housing. A pH-sensitive fluorophore is attached to the outside of the housing, this fluorophore responds to changes in pH with altered fluorescence lifetime decay. This is compared with a second fluorophore unaffected by pH; the measured phase difference is compared against phase differences measured during calibration. From these phase differences pH is calculated. All measurements are temperature compensated. Electrical conductivity/salinity is also measured and is used to approximate alkalinity, enabling calculation of seawater carbonate chemistry parameters.
Brand: Aquation Pty Ltd
Aquation’s pHalkon pH monitor measures pH, temperature and salinity. It is designed for marine and estuarine applications where knowing short-term changes in pH is important. The salinity sensor enables estimation of seawater carbonate chemistry including carbonate saturation states. pHalkon: pH, alkaline, ocean, numerics.