Selective electrochemical determination of bisphenol A via a Fe3O4 NPs derivative-modified graphite screen-printed electrode

This study introduced electrochemical activation of 2-(4-((3-(trimethoxysilyl) propylthio)methyl)1-H1,2,3-triazol-1-yl) aceticacid-Fe3O4 nanoparticle (Fe3O4 NPs derivative)-modified screen-printed electrode (Fe3O4 NPs/SPE) for electroanalytical determination of bisphenol A. In comparison to the bare electrode, Fe3O4 nanoparticles-modified electrode largely increased the oxidation peak current of bisphenol A and decreased oxidation overpotential. This implies that the modified electrode can significantly promote determination sensitivity of bisphenol A. The bisphenol A oxidation peak current gained by DPV enhanced linearly with its concentration at the range between 0.03 and 700.0 μM, while Pearson correlation coefficient was equal to 0.9998 and limit of detection was less than 0.01 μM. © 2019 Informa UK Limited, trading as Taylor & Francis Group

Plants Role in Reducing Heavy Metals from Polluted Soil Leachate

Aims In the past few decades, more attention has been paid to clean up soils polluted with heavy metals by plants. A serious problem in this way is the amount of heavy metals uptake by plants. This study was conducted to evaluate the effectiveness of 3 local plants of Mazandaran province, Iran, in reducing and controlling the soil’s heavy metals. Instrument & Methods The removal amount of three heavy metals (lead, zinc and cadmium) by native plants (maize, velvetleaf and wild amaranth) was investigated in alkaline (pH=8) and acidic (pH=5) soils and also using three substances such as EDTA, ammonium citrate and phosphate. The concentrations of these metals in leachate were measured by using atomic absorption spectrometry method. Findings Lead, cadmium and zinc levels in leachate in treatments with plants were less than unplanted ones. The concentrations of these metals in the produced leachate of treatments with acidic soils were higher than those with alkaline soils. In the treatments of soil polluted with additives, treatments containing ammonium phosphate and EDTA had the lowest and highest concentrations of heavy metals, respectively. Concentrations of these metals in treatments without plants were higher than those with plants. Conclusion Increasing of soil pH is effective on stabilization of heavy metals in soil. Ammonium phosphate plays an important role in stabilizing and EDTA and ammonium citrate increase the mobility of lead, zinc and cadmium in soil and groundwater

Voltammetric determination of antidiabetic drug gliclazide in the presence of glibenclamide in real samples

The work descibe a modified screen printed electrode (SPE) for the concurrent analysis of gliclazide and glibenclamide. The modification of the SPE was performed using Fe3O4nanoparticles (Fe3O4NPs) derivative. When used for the oxidation of gliclazide under optimal conditions, the over-potential associated with the oxidation of gliclazide dropped for about 130 mV as opposed to the case of unmodified SPEs. The modified electrodes were used to monitor the electrochemical-behavior of gliclazide through differential pulse voltammetry (DPV) and cyclic voltammetry (CV), and also obtain some kinetic data on gliclazide. The response of the electrode was found to be linear from 0.5 to 600.0 μM and a detection limit of 0.1 μM (based on 3s/m) was reached through DPV. The Fe3O4 NP/SPE was applied to the determine gliclazide and glibenclamide in the drug and urine samples. The results indicated satisfactory recovery of two analytes. Hence, it was concluded that the electrode is applicable for the analysis of gliclazide and glibenclamide in drug administration and clinical laboratories. © 2020 The Authors