Add time:07/15/2019         Source:sciencedirect.com

Phosphorous is one of three major nutritional elements for plants and usually exists as phosphate ions in nature. For hydroponic culturing and wastewater treatment, the development of a high-performance phosphate sensor would be very helpful. A novel phosphate ion-selective electrode was constructed using a cobalt phosphate surface coated cobalt electrode. The potential response seems to be caused by the formation of Co(H2PO4)2 in the coexistence of CoO and Co(OH)2. The sensor exhibited a linear response to H2PO4− in the concentration range from 1.0 × 10−5 to 1.0 × 10−1 mol L−1 at a pH range from 4.0 to 6.5 with a slope of −39 mV dec−1. The sensor was unaffected by common anions, such as chloride, carbonate, and sulfate. The electrode maintained stability for at least 4 weeks in a live hydroponics system when sufficient Co3(PO4)2·8H2O was deposited on the Co electrode.

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