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. 2021 May 20;9:671173. doi: 10.3389/fchem.2021.671173

Figure 1.

Figure 1

Optimization of GO concentration for Cu(II) ions adsorption on GO-modified SPCE; (A) CVs of Cu(II)/GO-modified SPCEs with different GO contents and (B) corresponding oxidation peak currents, in 0.20 M acetate buffer (pH 5.5).