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Solution A:  0.025 M phosphoric acid. Adjust with triethylamine to a pH of 3.0 ¡À 0.1.
Mobile phase:  Acetonitrile and Solution A (13:87)
Standard solution:  Transfer 12.5 mg of USP Ciprofloxacin RS to a 25-mL volumetric flask. Add 0.1 mL of 7% phosphoric acid, and dilute with Mobile phase to volume.
System suitability stock solution:  0.025 mg/mL of USP Ciprofloxacin Ethylenediamine Analog RS in Mobile phase
System suitability solution:  Transfer 1.0 mL of the System suitability stock solution to a 10-mL volumetric flask, and dilute with the Standard solution to volume.
Sample solution:  Transfer 25 mg of Ciprofloxacin to a 50-mL volumetric flask. Add 0.2 mL of 7% phosphoric acid, and dilute with Mobile phase to volume.

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2Â¥: Originally posted by Ö¬ÖÊÌå at 2023-06-17 01:21:01
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Solution A:  0.025 M phosphoric acid. Adjust with triethylamine to a pH of 3.0 ¡À 0.1.
Mobile phase:  Acetonitrile and Solution A (13:87)
Standard solution:  Transfer 12.5 mg of USP C ...

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