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Electrochemical Sensor Based on NiAlPO‐5 for Determination of Cu 2+ in Ethanol Biofuel
Author(s) -
Cruz de Castro Aleff,
França Aldilene Santos,
Rojas Alex,
Cavalheiro Éder Tadeu Gomes,
Marques Edmar Pereira,
Marques Aldaléa Lopes Brandes
Publication year - 2017
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201700287
Subject(s) - detection limit , electrode , cyclic voltammetry , electrochemistry , materials science , analytical chemistry (journal) , graphite , zeolite , nickel , voltammetry , stripping (fiber) , chemistry , catalysis , chromatography , composite material , metallurgy , organic chemistry
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 Cu 2+ 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 Cu 2+ 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 Cu 2+ in comparison with the electrode based in AlPO‐5. The proposed method presented a linear response for Cu 2+ with good results for limit of detection (9.4×10 −9 mol L −1 ), accuracy (recovery of 115 %) and precision (RSD of 5.9 %).