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. 2021 Feb 15;9:631909. doi: 10.3389/fchem.2021.631909

FIGURE 4.

FIGURE 4

Characterization study of sensor Ribo2: (A): Time gradient. (B) Selectivity of 100 μM and 1,000 μM. (C) Concentration gradient of Co2+. (D) Concentration gradient of Ni2+. Line graph represents the OD value.