Abstract:The performance of a carbon paste electrode (CPE) modified with SBA-15 nanostructured silica organofunctionalised with 2-benzothiazolethiol for determination of Cu(II) ions in sugar cane spirit (cachaça) is described, based on differential pulse anodic stripping voltammetry (DPASV) procedure. The Cu(II) oxidation peak was observed at -0.03 V (vs. SCE) in phosphate solution (pH 3.0). The results were obtained using optimised conditions such as 100 mV pulse amplitude, 3 min accumulation time, 25 mV s -1 scan rat… Show more
“…As waited unmodified GPU electrode containing only graphite as conducting material does not present adequate properties to preconcentrate Cu 2+ in low levels of concentration on the electrode surface. Differently, AlPO‐5 material has some proprieties that can confer an improvement in preconcentration stage and consequently a better voltammetric response, even containing a neutral structure.…”
This work describes the development of electrochemical sensors based on graphite–polyurethane composite (GPU) modified with aluminophosphate zeolite type 5 (AlPO‐5) and nickel (II) incorporated aluminophosphate type 5 (NiAlPO‐5), in order to evaluate their performance for determination of Cu2+ in ethanol biofuel. These electrodes were initially characterized by cyclic voltammetry. The obtained results revealed that the NiAlPO‐5 with Ni/Al ratio 0.5 presented the best response in terms of sensitivity, and peak width at half height of Cu2+ voltamogramm, which indicate that on these conditions the NiAlPO‐5 electrode is viable for determination of this ion in biofuel samples by square wave stripping voltammetry. The obtained results revealed that the presence of Ni in the zeolite structure (NiAlPO‐5) improves the electrical properties, and increases the peak current for Cu2+ in comparison with the electrode based in AlPO‐5. The proposed method presented a linear response for Cu2+ with good results for limit of detection (9.4×10−9 mol L−1), accuracy (recovery of 115 %) and precision (RSD of 5.9 %).
“…As waited unmodified GPU electrode containing only graphite as conducting material does not present adequate properties to preconcentrate Cu 2+ in low levels of concentration on the electrode surface. Differently, AlPO‐5 material has some proprieties that can confer an improvement in preconcentration stage and consequently a better voltammetric response, even containing a neutral structure.…”
This work describes the development of electrochemical sensors based on graphite–polyurethane composite (GPU) modified with aluminophosphate zeolite type 5 (AlPO‐5) and nickel (II) incorporated aluminophosphate type 5 (NiAlPO‐5), in order to evaluate their performance for determination of Cu2+ in ethanol biofuel. These electrodes were initially characterized by cyclic voltammetry. The obtained results revealed that the NiAlPO‐5 with Ni/Al ratio 0.5 presented the best response in terms of sensitivity, and peak width at half height of Cu2+ voltamogramm, which indicate that on these conditions the NiAlPO‐5 electrode is viable for determination of this ion in biofuel samples by square wave stripping voltammetry. The obtained results revealed that the presence of Ni in the zeolite structure (NiAlPO‐5) improves the electrical properties, and increases the peak current for Cu2+ in comparison with the electrode based in AlPO‐5. The proposed method presented a linear response for Cu2+ with good results for limit of detection (9.4×10−9 mol L−1), accuracy (recovery of 115 %) and precision (RSD of 5.9 %).
“…Over recent years, development of novel sensors for the detection of heavy metals has increased because of the importance of controlling the level of environmental pollutants in various samples. Regarding to, an extensive effort has been explained in the synthesis and characterization of various carriers to develop new sensors for the determination of various ions, in different real samples [4][5][6][7][8][9][10][11][12][13][14][15][16][17]. The advantages of ion selective electrodes (ISEs) including accuracy, portability, sensitivity and selectivity, low cost and ease of use have led to the development and application of some ISEs based on the application of different ionophores, for the determination of Cu 2+ ions.…”
n this paper, 1-cyano-1-piperidino-2(N- piperidino meth-yl)-cyclohexane was synthesized. The lowest-energy conformer of this molecule (Ligand) with axial and equatorial forms of cyanide toward cyclohexane and local minima corresponding to their complexes with various ions were obtained using Monte Carlo procedure by Molecular Mechanics with MMFF94 method. The calculated results of the Gibbs free energy of the reaction using density functional theory (DFT) show that the thermodynamic reactivity of complexation of copper ion with studied ligand is the best. Finally, a selective and sensitive copper-ion selective liquid membrane electrode for potentiometric monitoring of ultra-trace amounts of Cu2+ was prepared by using 1-cyano-1-piperid-ino-2(N- piperidino methyl)-cyclohexane as an excellent ionophore. This electrode exhibits a Nernstian response for Cu2+ ions over a con-centration range (1.5 × 10-2 to 1.0 × 10-8 mol L-1) with a slope of 28.4±0.4 mV per decade. The limit of detection of the sensor is 6.3 × 10-9 mol L-1. The sensor has a relatively fast response time (<10 s) and a useful working pH range of 5.0–8.5. Interference of some cations was also evaluated. The practical utility of the Cu2+ ion sensor has been demonstrated by using it as an indicator electrode in potentiomet-ric titration of Cu2+ with EDTA and for direct determination of Cu2+ in well water samples.
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