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In this study, a coprecipitation method followed by a hydrothermal treatment was used to synthesize Mg-Al-Ox (Ox = oxalate) layered double hydroxide (LDH), then used as the stationary phase in solid-phase extraction (SPE) for preconcentration of amoxicillin. Extraction was carried out at pH 7, flow rate 2 mL/minute, and LDH loading 20 mg. The mobile phase is 0.1 M NaOH solution. The extraction process is still running well for up to three cycles. LDH Mg-Al-Ox can be a good choice as the SPE stationary phase for the preconcentration of anionic drugs in the environment.

SOLID-PHASE EXTRACTION OF AMOXICILLIN IN AQUEOUS SYSTEM BY USING Mg-Al-OXALATE LDH AS A STATIONARY PHASE