The individual stock standard solutions were prepared by weighing 12.50 mg of each standard into the volumetlric flask and then dissolved to 25 mL with acetone to obtain 500 mg L1 solution and stored at 20 C.
The individual stock standard solutions were prepared by weighing 12.50 mg of each standard into the volumetlricflask and then dissolved to 25 mL with acetone to obtain 500 mg L1 solution and stored at 20 C.