Add time:07/13/2019         Source:sciencedirect.com

A potentiometric method was described for the determination of iron(III) in petroleum water samples using modified carbon paste and screen-printed sensors. These sensors were embodied with multi-walled carbon nanotubes (MWCNTs) since it improved the performance of the sensors in presence of (methyl 6-(hydroxymethyl) picolinate) ionophore. The fabricated sensors can be applied successfully for the potentiometric determination of iron(III) ions in the concentration range of 1.0 × 10−6–1.0 × 10−2 mol L−1 with a detection limit of 1.0 × 10−6 mol L−1 for modified carbon paste electrodes (MCPEs) and 2.6 × 10−7–1 × 10−2 mol L−1 with a detection limit of 2.6 × 10−7 mol L−1 for the modified screen-printed electrode (MSPEs). The slopes of the calibration graphs were 19.9 ± 0.41 and 19.0 ± 0.16 for MCPEs with tricresylphosphate (TCP; electrode I) and dioctylsebacate (DOS; electrode II) as plasticizers, respectively. Also, the MSPEs showed good potentiometric slopes of 20.4 ± 0.30 and 19.6 ± 0.28 mV decade−1 with tricresylphosphate (TCP; electrode III) and dioctylsebacate (DOS; electrode IV) as plasticizers, respectively. The sensors were successfully applied for the determination of Fe(III) in petroleum water samples. The results obtained applying these potentiometric sensors were comparable with those obtained using atomic absorption spectrometry (AAS).

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