Rapid Determination of Mercury Ions in Environmental Water Based on an N-Rich Covalent Organic Framework Potential Sensor

Figure 6

Potential response curve for the GPE/COF_TFPB-TZT electrode to Hg²⁺ in Tris-HCl buffer (pH = 6.0). The concentrations of Hg²⁺ are 1.0 × 10⁻⁹∼1.0 × 10⁻⁴ mol/L. The inset shows the linear portions of the calibration curve. The error bars are absolute errors deduced from at least three replicate measurements, and the RSDs for all the concentrations are in the range of 3.3∼11%.