Evaluation of a carbon paste electrode modified with organofunctionalised SBA-15 silica in the determination of copper

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 rate in phosphate solution pH 3.0, resulting in a linear dynamic range from 8.0 x 10 -7 to 1.0 x 10 -5 mol L -1 Cu(II) and a limit of detection 2.0 x10 -7 mol L -1 . Cu(II) spiked in a cachaça sample was determined with 102.5 % mean recovery at mmol L -1 level. Interference from other metallic cations present in the sample was avoided by the standard addition procedure.

Electrochemical Sensor Based on NiAlPO‐5 for Determination of Cu2+ in Ethanol Biofuel

“…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.…”

Rapid Monitoring of Copper Over a Wide Concentration range by High-Sensitive Potentiometric Membrane Electrode Based on 1-cyano-1-piperidino-2(N- piperidino methyl)-cyclo hexane

“…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.…”