Add time:09/24/2019 Source:sciencedirect.com
The differential pulse and direct current polarographic behaviour of benzylpenicilloic acid (BPA) is discussed. In pH 9.2 borate buffer, the single anodic wave (E12 = -0.25 V) obtained is diffusion-controlled at concentrations less than 2 × 10-5 M but adsorptioncontrolled in 10-4 M solution. Cyclic voltammetry at a hanging mercury drop electrode shows that the electrode reaction is reversible at pH 9.2. The differential pulse peak current is linearly related to concentration in the range 10-6—2 × 10-5 M. Penicillamine yields an anodic peak well separated from the BPA peak. Both substances may be determined in each other's presence. Intact penicillin decreases the BPA peak but the linearity between ip and BPA concentration is maintained.
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