Development of a potassium-selective optode for hydroponic nutrient solution monitoring

► Potassium-selective bulk optode for hydroponic nutrient solution monitoring. ► Summary review of all published potassium bulk optodes. ► Description of developed absorption-based fibre optic instrument. ► Characterization of sensor selectivity, influence of pH/temperature, lifetime, etc. ► Overview of specific space-based and terrestrial technology transfer benefits.