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UV–visible absorption spectra of synthesized silver nanoparticles using tested solutions: (a) TS1—beech bark extract, pH = 4, AgNO3; (b) TS2—beech bark extract, pH = 9, AgNO3; (c) TS3—beech bark extract, pH = 4, AgC2H3O2; (d) TS4—beech bark extract, pH = 9, AgC2H3O2.
