Electrodes modified by he electrodeposition of conducting polymers wer
e used for the detection and quantitative determination of some inorga
nic, organic, and biological molecules. Monomers used were five member
ed ring heterocycles or crown ethers and their derivatives. The polyme
r films were deposited on glassy carbon or platinum substrates. The re
sulting electrodes were used in the amperometric mode or in the potent
iometric mode for flow injection and chromatographic analyses. The res
ults showed that the proposed modified surface catalyzes the oxidation
of organic and biological compounds. The detection of electroinactive
inorganic anions, such as F-, Cl-, Br-, NO2- and NO3- was also possib
le using a Cu(II)-containing poly(3-methylthiophene) working electrode
for the single-column ion chromatography. The development of a novel
type of poly(crown ether) electrode that is capable of selectively det
ermining some 1,2-dihydroxybenzenes will also be discussed.