Surface blocking of azolla modified copper electrode for trace determination of phthalic acid esters as the molecular barricades by differential pulse voltammetry: response surface modelling optimized biosensor

Abstract

In this work, a sensitive and efficient voltammetric biosensor was introduced for differential pulse voltammetric (DPV) determination of dibutyl phthalate, dimethyl phthalate, di(2-ethylhexyl)phthalate and dicyclohexyl phthalate in aqueous solutions.

Magnetite azolla impedimetric nanobiosensor for phthalic acid esters quantification

“…3a and b. 21 As shown, the average particle and pore sizes of the azolla powder were in the micrometre and nanometre scales, respectively.…”

“…24 The Nyquist plots of the Cu electrode and AZIB were discussed in our last research, before and after PAEs injection. 21 According to the results, the total resistance ( R T ) and R CT of the Cu electrode were obtained as 542.8 kΩ and 468.8 kΩ, respectively. Also, the R T and R CT of AZIB were obtained as 551.6 kΩ and 438.7 kΩ, respectively.…”

“…In our previous study, the injection of a specic amount of PAEs on the surface of AZIB was studied by the EIS method. 21 Herein, an increase in the charge-transfer resistance (R CT ) aer injection of PAEs into the sensors was noticed. This work was carried out to complete the previous study on AZIB and to additionally investigate the use of magnetite-modied azolla in the impedimetric biosensor structure (MAZIB) and to compare the obtained gures of merits of AZIB and MAZIB.…”

“…Fig.5(a) Nyquist plot, (b) constructed circuit of AZIB after PAEs injection, applied potential = −1 V and frequency = 0.1-1 × 10 5 Hz 21. …”

“…CT values after the injection of 3 mg L −1 PAEs as blocker21 DR CT = R CT 2 − R CT 1 (R CT 1 : R CT for AZIB = 438.7 kU).…”