Physicochemical, Thermal and Spectroscopic Characterization of Sodium Selenate Using XRD, PSD, DSC, TGA/DTG, UV-vis, and FT-IR

Journal: Marmara Pharmaceutical Journal PDF  Web

Published: 06.12.2016 Volume: 21 Issue: 2 Pages: 311-318

DOI: 10.12991/marupj.300796 ISSN: 1309-0801

Authors: Mahendra Kumar Trivedi, Kalyan Kumar Sethi, Parthasarathi Panda, Snehasis Jana

Citation: Kumar Trivedi M, Kumar Sethi K, Panda P, Jana S. Physicochemical, Thermal and Spectroscopic Characterization of Sodium Selenate Using XRD, PSD, DSC, TGA/DTG, UV-vis, and FT-IR. Marmara Pharm J. 2017; 21(2): 311-318. http://dx.doi.org/10.12991/marupj.300796

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Abstract

Sodium selenate is an important inorganic compound, but lacks reliable and accurate physico-chemical and spectral characterization information. This article described the in-depth physicochemical, thermal, and spectroscopic characterization of sodium selenate using various analytical techniques. The powder X-ray diffractogram showed well- defined, narrow and sharp peaks revealed that sodium selenate is crystalline in nature. The crystallite size was found to be in the range of 28.75 to 49.97 nm. The average particle size was found to be of 3.93 (d10), 14.44 (d50), and 40.648 (d90) ?m with an average surface area of 0.676 m2/g. The differential scanning calorimetry showed the endothermic inflation at 588.81 °C with the latent heat of fusion 103 J/g. The thermogravimetric analysis revealed two steps of the thermal degradation process. Similarly, the differential thermogravimetric analysis exhibited the major peaks in the thermogram and disclosed Tmax at 852.65 °C. The UV-visible spectrum showed maximum absorbance at 205.1 nm (?max). This indicated sodium selenate thermally more stable in nature. The Fourier transform infrared spectrum showed a peak at 888 cm-1 due to the Se-O stretching. This information would be very much useful in the field of nutraceuticals/ pharmaceuticals and other industries using sodium selenate as an ingredient.

Conclusion

The current study effectively investigated in-depth physiochemical, thermal, and spectroscopic characterization of sodium selenate using XRD, PSD, DSC, TG/DTG, UV-vis, and FT-IR analytical technique. The sodium selenate PXRD patterns showed significant narrow, and sharp peak at Bragg’s angle (2?) position, indicating the crystalline nature of sodium selenate. The crystallite size was found to be in the range of 28.75 to 49.97 nm. The average particle size of sodium selenate was 3.93 (d10), 14.44 (d50), and 40.65 µm (d90) and average surface area of 0.676 m2/g. The calculated span and relative span value were 36.71 µm and 2.54, respectively. The DSC thermogram of sodium selenate showed endothermic inflation at 588.81 °C. The overall thermal characterization indicated that the thermal stability of sodium selenate is very high, as it had the long range melting/degradation temperature. The UV-visible spectrum showed the highest absorbance maxima (?max) at of 205.1 nm. The FT-IR spectrum showed the strong and sharp peak at 888 cm-1 due to the Se-O stretching. These in-depth, comprehensive, physiochemical, thermal, and spectroscopic solid state characterization information of sodium selenate would be a useful asset. This can set a standard for scientific qualitative and quantitative analysis of nutraceuticals, pharmaceuticals and other industries utilizing sodium selenate as an ingredients.