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The applicability of boron‐doped diamond (BDD) as a working electrode in an amperometric cell, coupled to HPLC, was demonstrated, for determining benzodiazepines in pharmaceutical preparations. The separation of the benzodiazepines was achieved using a Waters XTerra RP18 column (250×4.6 mm, 5 μm) with a mobile phase sodium phosphate (pH 3.5; 0.10 mol L−1)‐acetonitrile (65 : 35, v/v) at flow of 1.2...