Amines Ammonia Chlorine compounds Dissolution Dissolved ammonia Dissolved ammonia sensor Dissolved oxygen Dissolved oxygen contents Energy harvesting Energy transfer Fish Fish ponds Forster resonance energy transfer Hydrogel membrane Hydrogel sensing membrane Hydrogels Lakes Level detections Membranes Optical FRET Organo-metallic complexes Organometallics Parts per billion Phosphate buffers Polyvinyl chlorides Ruthenium compounds Sensing membranes Silicones WATER dissolved ammonia sensor