A voltammetric method for diuron determination in river water

Soares, Fernanda Heloisa Macedo; Ramalho, Raissa; Silva, Amanda; Araújo, Mário César Ugulino de

doi:10.1002/elan.202200486

Cited by 2 publications

(1 citation statement)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The curve of the variation of the potential as a function of the pH is shown in (Figure 5C) from which the potential was shown to decrease linearly as the pH increases. The slope of the linear regression was estimated at 73 mV/pH indicating that there is a transfer of one electron per proton [46, [51][52][53]. Furthermore, the representation of the peak current as a function of the pH (Figure 5D) indicates a maximum current reached at pH = 8.…”

Section: Effect Of Phmentioning

confidence: 99%

Sensitive determination of diuron on zinc oxide nanoparticles modified carbon paste electrode in soil and water samples

Ouedraogo,

Tall,

Bako

et al. 2023

Electroanalysis

View full text Add to dashboard Cite

An electrochemical sensor based on Zinc oxide nanoparticles (ZnONPs) modified carbon paste electrode was designed for the toxic diuron pesticide detection. The ZnONPs were synthesized through the hydrothermal route and their structural properties were investigated via scanning electron microscopy (SEM) and X‐ray diffraction powder (XRD). The designed ZnONPs‐modified carbon paste electrode (ZnONPs‐CPE) was characterized using cyclic voltammetry and electrochemical impedance spectroscopy. The sensor showed significantly enhanced sensitivity on the diuron oxidation peak current, compared to the bare carbon paste electrode. Qualitative and quantitative analysis were performed using cyclic voltammetry (CV) and square wave voltammetry (SWV). Experimental parameters such as pH, amount of ZnONPs and frequency were evaluated and the optimized conditions were obtained with 0.1 M phosphate buffer solution at pH=8, a frequency of 50 Hz and a quantity of 5 mg of ZnONPs. Under these conditions, linear responses ranging from 1.3 to 7.7 μM and 8.6 to 30 μM of diuron were obtained, with correlation coefficients of R2=0.994 and 0.996 respectively. Detection and quantification limits of 0.22 μM and 0.84 μM (S/N=3) were respectively achieved based on the 3σ method. The interference of some ions on the oxidation peak of diuron on ZnONPs‐CPE was also evaluated and no interference was observed, therefore demonstrating the selectivity of the sensor. The proposed sensor, designed with ecofriendly materials, is sensitive, selective and was effectively used for diuron determination in soils and water samples with recoveries ranging from 98 % to 101.5 %.

show abstract

Section: Effect Of Phmentioning

confidence: 99%