Electrochemical determination of lead and cadmium in rice by a disposable bismuth/electrochemically reduced graphene/ionic liquid composite modified screen-printed electrode

2014 ◽  
Vol 199 ◽  
pp. 7-14 ◽  
Author(s):  
Zhiqiang Wang ◽  
Hui Wang ◽  
Zhihao Zhang ◽  
Gang Liu
Keyword(s):  
Ionic Liquid ◽  
Electrochemical Determination ◽  
Screen Printed Electrode ◽  
Lead And Cadmium ◽  
Reduced Graphene ◽  
Screen Printed

Electrochemical Determination of Dextromethorphan on Reduced Graphene Oxide Modified Screen-Printed Electrode after Electromembrane Extraction

2014 ◽  
Vol 26 (3) ◽  
pp. 521-529 ◽  
Author(s):  
Ali Reza Fakhari ◽  
Mohammad Hossein Koruni ◽  
Hamid Ahmar ◽  
Abolfath Shahsavani ◽  
Siyavash Kazemi Movahed
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Electrochemical Determination ◽  
Screen Printed Electrode ◽  
Reduced Graphene ◽  
Electromembrane Extraction ◽  
Screen Printed

scholarly journals A novel dopamine electrochemical sensor based on La3+/ZnO nanoflower modified graphite screen printed electrode

2019 ◽  
Vol 9 (3) ◽  
pp. 187-195 ◽  
Author(s):  
Somayeh Tajik ◽  
Hadi Beitollahi ◽  
Mohammad Reza Aflatoonian
Keyword(s):  
Modified Electrode ◽  
Phosphate Buffer Solution ◽  
High Sensitivity ◽  
Differential Pulse ◽  
Electrochemical Determination ◽  
Screen Printed Electrode ◽  
Buffer Solution ◽  
Optimized Conditions ◽  
Screen Printed

Flower-like La3+/ZnO nanocomposite was facile synthesized. A simple and ultrasensitive sensor based on graphite screen printed electrode (SPE) modified by La3+/ZnO nanoflower was developed for the electrochemical determination of dopamine. The electrochemical behavior of dopamine was studied in 0.1 M phosphate buffer solution (PBS) using cyclic voltammetry (CV), chronoamperometry (CA) and differential pulse voltammetry (DPV). Compared with the unmodified graphite screen printed electrode, the modified electrode facilitates the electron transfer of dopamine, since it notably increases the oxidation peak current of dopamine. Also, according to CV results the maximum oxidation of dopamine on La3+/ZnO/SPE occurs at 150 mV which is about 140 mV more negative compared with unmodified SPE. Under optimized conditions, the modified electrode exhibited a linear response over the concentration range from 0.15 to 300.0 μM, with a detection limit of 0.08 μM (S/N = 3). The proposed sensor exhibited a high sensitivity, good stability and was successfully applied for dopamine determination in dopamine ampoule, with high recovery.

Simultaneous determination of trace Cd2+ and Pb2+ using GR/l-cysteine/Bi modified screen-printed electrodes

2018 ◽  
Vol 10 (40) ◽  
pp. 4945-4950 ◽  
Author(s):  
Chao Li ◽  
Xiaole Zhao ◽  
Xiaojun Han
Keyword(s):  
Graphene Oxide ◽  
Simultaneous Determination ◽  
Reduced Graphene Oxide ◽  
Anodic Stripping Voltammetry ◽  
Stripping Voltammetry ◽  
Screen Printed Electrode ◽  
Reduced Graphene ◽  
Anodic Stripping ◽  
Screen Printed

A GR/l-cys/Bi/SPE (reduced graphene oxide/l-cysteine/Bi/screen-printed electrode) was prepared to simultaneously determine Cd2+ and Pb2+ ions by using SWASV (square wave anodic stripping voltammetry).

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