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The UV–visible absorption spectra of; (a) crude plant extract with variable concentrations ranging from 1 × 10-5 gmol-1 to 1 × 10-3 gmol-1 at ambient temperature without addition of silver nitrate solution (1 × 10-5 mol L-1, aqueous solution); (b) after addition of 1 × 10-5 mol L-1 aqueous solution of silver nitrate
