• Mu Naushad

      Articles written in Bulletin of Materials Science

    • A new ion-selective electrode based on aluminium tungstate for Fe(III) determination in rock sample, pharmaceutical sample and water sample

      Mu Naushad

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      An inorganic cation exchanger, aluminum tungstate (AT), has been synthesized by adding 0.1 M sodium tungstate gradually into 0.1 M aluminium nitrate at pH 1.2 with continuous stirring. The ion exchange capacity for Na+ ion and distribution coefficients of various metal ions was determined on the column of aluminium tungstate. The distribution studies of various metal ions showed the selectivity of Fe(III) ions by this cation exchange material. So, a Fe(III) ion-selective membrane electrode was prepared by using this cation exchange material as an electroactive material. The effect of plasticizers viz. dibutyl phthalate (DBP), dioctylphthalate (DOP), di-(butyl) butyl phosphate (DBBP) and tris-(2-ethylhexylphosphate) (TEHP), has also been studied on the performance of membrane sensor. It was observed that the membrane containing the composition AT: PVC: DBP in the ratio 2 : 20 : 15 displayed a useful analytical response with excellent reproducibility, low detection limit, wide working pH range (1–3.5), quick response time (15 s) and applicability over a wide concentration range of Fe(III) ions from 1 × 10-7 M to 1 × 10-1 M with a slope of 20 ± 1 mV per decade. The selectivity coefficients were determined by the mixed solution method and revealed that the electrode was selective for Fe(III) ions in the presence of interfering ions. The electrode was used for atleast 5 months without any considerable divergence in response characteristics. The constructed sensor was used as indicator electrode in the potentiometric titration of Fe(III) ions against EDTA and Fe(III) determination in rock sample, pharmaceutical sample and water sample. The results are found to be in good agreement with those obtained by using conventional methods.

    • Recent analytical applications of nanoparticle sensitized lucigenin and luminol chemiluminescent reactions

      S M Wabaidur Mu Naushad Z A Alothman

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      There is an ever-increasing demand for rapid, sensitive, cost effective and selective detection methods for the analysis of many essential compounds.When chemiluminescence has been introduced to analytical chemistry as a detection technique, it has been shown to meet many of these requirements. This method has become a powerful tool for the determination of many compounds. Using this method, low detection limits can be obtained with simple and inexpensive instrumentation. Coupled with flow injection technique the method has become more popular for wider applications. Since many excellent reviews on the chemiluminogenic techniques have appeared in the literature in recent years, the present paper does not intend to cover the exhaustive studies in this area, but will selectively describe the analytical applications of nanoparticle sensitized lucigenin and luminol chemiluminescent reactions and evaluate their recent progress together with our present work.

    • Preparation of new thermoluminescent material ($100−x$)B$_2$O$_3$–xLi$_2$O: Cu$^{2+}$ for sensing and detection of radiation

      Zeid A Alothman Tansir Ahamad Mu Naushad Saad M Alshehri

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      The copper-doped lithium borate glass as a thermoluminescent (TL) material ($100−x$)B$_2$O$_3$–$x$Li$_2$O: Cu$^{2+}$ ($x = 20$, 50 and 80 mol%) was prepared by the combustion method. The formation of ($100−x$)B$_2$O$_3$–$x$Li$_2$O: Cu$^{2+}$ after doping 2, 3 and 5 ppm Cu$^{2+}$, was characterized by Fourier transform infrared spectroscopy, X-ray diffraction and transmission electron microscopy. The TL characteristics of the synthesized material were studied at different parameters. The synthesized glass 50B$_2$O$_3$–50i$_2$O: Cu$^{2+}$ with 3 ppm of doped Cu$^{2+}$, exhibited the superior TL properties than other glasses prepared in the current study. The spin-Hamiltonian parameters were assessed using the electron spin resonance spectra of 50B$_2$O$_3$–50Li$_2$O: Cu$^{2+}$ doped with 3 ppm Cu$^{2+}$. The spin-Hamiltonian parameter values in the case of Cu$^{2+}$ revealed that the ground state of Cu$^{2+}$ was $dx^2–y^2$ orbital (${}^2$B$_{1g}$) and the site symmetry around Cu$^{2+}$ ion was distorted octahedral. TL glow curves were recorded with different heating rates (1, 2, 5, 10, 15, and 20°C s$^{−1}$) at the fixed dose $10\times 10^3$ Gy. The results revealed that the glow peak position shifted to higher temperature with heating rate and the heating rate of 10°C s$^{−1}$ showed the superior TL response with highest glow peak which is very good for dosimetry purposes.

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