ADSORPTIVE STRIPPING VOLTAMMETRY OF A FENTANYL DERIVATIVE AT A MERCURY-ELECTRODE

In a supporting electrolyte of NaOH, a pair of cathodic and anodic pea ks of N'-bis(l-phenylmethyl-4-piperidinyl)-ethanediamide (DBPPE) is fo und by cyclic voltammetry at a Hg electrode. The cathodic and anodic p eak potentials are -1.53 and -1.46 V (vs. Ag/AgCl), respectively. The cathodic peak shows adsorptive characteristics when the concentration of DBPPE is low and the preconcentration time is long. The adsorbed sp ecies is most probably the DBPPE neutral molecule. The method for meas uring trace amount of DBPPE by adsorptive stripping voltammetry is est ablished and the detection limit can reach 5 x 10(-9) M with a 6-min p reconcentration.