Sample: Content determination: Test product solution: Take 20 tablets of this product, remove the coating (the film-coated tablet can not remove the coating), accurately weigh, grind, accurately weigh the appropriate amount (about 10mg of diclofenac sodium) In a 100mL volumetric flask, add methanol to dissolve and dilute to the mark, shake well, filter, take 5mL precisely, place in a 50mL volumetric flask, dilute with methanol to the mark, and shake well.
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