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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 11, No. 4, 2014, pp. 1115-1126
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Bioline Code: st14110
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 11, No. 4, 2014, pp. 1115-1126
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Cadmium (II)-selective electrode based on palm shell activated carbon modified with task-specific ionic liquid: kinetics and analytical applications
Ismaiel, A. A.; Aroua, M. K. & Yusoff, R.
Abstract
In this study, palm shell activated carbon
modified with task-specific ionic liquid was used as a novel
electrode component for the potentiometric determination
of cadmium ions in water samples. The proposed potentiometric
sensor has good operating characteristics, including
relatively high selectivity towards the Cd (II) ion, a
Nernstian response to Cd (II) ions in a working concentration
range of 1.0 × 10-9–1.0 × 10-2 M, with a reasonable
detection limit of 1 × 10-10 M and a slope of
30.90 ± 1.0 mV/decade. No significant changes in electrode
potential were observed when the pH was varied over
the range of 4–9. A direct technique based on the use of
ion-selective electrode potentiometry has been developed
in our laboratory for the study of reaction kinetics and
kinetic methods of analysis by continuous monitoring of
the rate of production or consumption of an ion. The
apparent adsorption rate constant was estimated assuming
pseudo-second-order kinetics. Additionally, the proposed
electrode has been successfully used for the determination
of the cadmium content in real samples without a significant
interaction from other cationic or anionic species.
Keywords
Heavy metals; Ion-selective electrode; Potentiometric sensor; Trioctylmethylammonium salicylate
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