A simple and sensitive method for the determination of 4-n-octylphenol based on multi-walled carbon nanotubes modified glassy carbon electrode

Electrochemical reduction of nalidixic acid at glassy carbon electrode modified with multi-walled carbon nanotubes

“…7 shows that the peak current decreases for a deposition time higher than 20 s. No further change in peak current was observed with the increasing time higher than 20 s. In most cases, peak intensity remains constant after a certain accumulation time, contrary than the result obtained in this work [43][44][45]. A decrease in the peak intensity with time was also observed by a few number of authors and it is attributed to the formation of multilayer on the electrode surface, which reaches a maximum thickness due to the lack of stability of the MWCNT [46,47]. In this way, part of the nanotubes can detach the electrode, decreasing the concentration of carbon nanotubes in the electrode surface, and as consequence, the amount of NAL adsorbed.…”

Electrochemical behaviour and voltammetric determination of p-phenylenediamine at carbon paste electrode

“…Fig. 3 shows that as pH value of the solution was increased, the redox peak is shifted negatively what indicates involvement of protons in the redox reaction [24]. Depending on a pH ranging from 3 to 7, the formal potential (E o ) for the anodic and cathodic peaks changed linearly.…”

Electrochemical sensors of octylphenol based on molecularly imprinted poly(3,4-ethylenedioxythiophene) and poly(3,4-ethylenedioxythiophene–gold nanoparticles)

“…The two sensors suffered from low sensitivity and a high limit of detection and could hardly full the monitoring of OP, which is usually at low concentration levels in the environment and can adversely affect organisms even at mg L À1 levels. 16 Zheng et al 17 developed a simple and sensitive electroanalytical method for the determination of 4-n-octylphenol, an isomer of OP, based on multi-walled carbon nanotubes (MWCNTs) modi-ed glassy carbon electrode (GCE). Wan et al 18 fabricated an electrochemical sensor for the determination of OP by electrochemical synthesis of poly(L-lysine) lm on a carbon nanotubes modied GCE.…”