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