Development of Electrochemical Sensors for Nutrient Components

SHIRAI Osamu, SOWA Keisei, KITAZUMI Yuki

doi:10.2116/bunsekikagaku.70.501

<p>Nutrient control is especially important to improve the yield of crops. It is necessary for continuous nutrient control to continuously measure the concentration of the nutrient components. Especially, the concentrations of K⁺, NO₃⁻, NH₄⁺, H₂PO₄⁻, and HPO₄²⁻ are important factors for plant growth. Electrochemical measurements using ion-selective electrodes (ISEs) are very attractive because the culture solution can be used for measurements of the nutrient concentrations without any pretreatment, and the concentrations can be rapidly evaluated on the spot. The authors’ research group has improved stable ISEs of NO₃⁻, H₂PO⁴⁻, and HPO₄²⁻ suitable for long-term measurements. As for the NO₃⁻-ISE, the sensing function was improved by eliminating the effect of coexisting Cl⁻. As for the H₂PO⁴⁻-ISE; the potential response can be stabilized by controlling the dissolved oxygen concentration in the solution. In this critical review, the preparation methods of these ISEs and their physicochemical properties are explained. We made a simple automatic management system for the nutrient concentration in a hydroponic culture solution using K⁺-, NO₃⁻-, and H₂PO⁴⁻-ISEs. In addition, we made a new pH sensor using Pd, which is one of hydrogen storage metals, since a glass electrode is easily broken, and it is difficult to miniaturize. The physicochemical properties of the pH sensor using a Pd electrode is also described.</p>

Development of Electrochemical Sensors for Nutrient Components

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