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Dynamic response range of biosensor toward different concentrations of ammonium ion under different pH (a); Look-up table method based on piecewise linear interpolation for pH compensation (b). The concentrations of GLDH, α-Ketoglutarate and NADH on the enzyme electrode were 2.0 U, 28 mM and 1.3 mM, respectively. The experimental temperature was controlled at 37 °C.
