2.1.2 preparation of gallic acid standard solution 0.02, 0.04, 0.06 concentration 0.08 0.10 mg/mL, and 5 mL volumetric pipette by gallic acid standard solution, 10 mg/mL concentration in volume 10, 20, 30, 40 and 50 µL and adjust the volume with distilled water, 5 mL.
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