Chromium sulfide nanoparticles as an ion-selective membrane electrode for chromium(III)
by Gaurang M. Patel; Shobhana K. Menon
International Journal of Nanoparticles (IJNP), Vol. 5, No. 3, 2012

Abstract: Nanoparticles of chromium sulfide were prepared in the organic phase and the optimum synthesis conditions for the nanoparticles were studied in detail. TEM and DLS results indicated that the size distribution of the nanoparticles was uniform with an average diameter of 45 nm. A novel chromium ion-selective electrode (ISE) was prepared by dispersing the chromium sulfide nanoparticles in polyvinylchloride (PVC) membrane and the optimum ratio of components in the membrane was determined. The linear range was 1.00 × 10⁻⁸ to 1.00 × 10⁻¹ mol L⁻¹ and the detection limit was 0.5 × 10⁻⁹ mol L⁻¹. The response of the electrode was fast with quite reasonable reproducibility, stability and the optimal pH in which the electrode could be used was from 5.0 to 8.0. Selectivity coefficients indicated that the electrode was selective to the primary ion over the interfering ion. The electrode can be used for at least two months without any divergence in potential. It was used to determine chromium in coffee sample; the results were in good agreement with the atomic absorption spectrometry (AAS) method.

Online publication date: Wed, 20-Aug-2014

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