Abstract
Oxidative stability of prototypical groundnut oil (GO) and mustard oil (MO) blended with a significant characteristic addition of antioxidants, α-tocopherol (α-T) and TBHQ (tert-butyl hydroquinone), at different concentrations was analysed. α-T (natural) and TBHQ (synthetic) antioxidants at a different concentrations from 0 to 20 mg/L were blended with GO and MO to prepare 18 samples. Compositional analysis of groundnut oil and mustard oil was carried out using gas chromatography and mass spectra (GCMS). Electrical properties like dielectric constant, tanδ, specific resistance etc. were investigated at frequencies from 1 Hz to 10 MHz for the modified samples. Thermal properties like breakdown voltage, flash and fire points and viscosity of all samples were also premeditated. It was observed that dielectric constant (ε′) of GO reduces from 3.58 to 2.82 with the addition of α-T but increases to 3.29 with the addition of TBHQ, whereas in MO, dielectric constant increases from 2.93 to 3.38 with the addition of α-T and rises to 3.27 with the addition of TBHQ at 15 mg/L. The synergistic effect of antioxidants in regulating the insulation nature of the oil is found to be more effective with α-tocopherol compared to TBHQ in GO. Higher breakdown voltage and more stability were observed in oil with the addition of antioxidant (TBHQ) in low concentration. The study would be useful in the selection of eco-friendly coolants in engineering and industry.
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The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
The authors would like to express their gratitude to the Vice Chancellor of SASTRA Deemed University for his encouragement and support. The authors also acknowledge PONDICHERRY University for helping to take readings in dielectric broad band spectrometer in the University lab.
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All the three authors have contributed equally in the completion of this manuscript. Material preparation, data collection, and analysis were performed by RVS and AK. The reproducibility of experiments: breakdown voltage, flash point, fire points was validated by NS. The first draft of the manuscript was written by RVS and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Sathianathan, R., Kannapiran, A. & Shanmugam, N. Investigation of electrical properties of eco-friendly vegetable oil blended with bioactive compound. Environ Sci Pollut Res 28, 50255–50265 (2021). https://doi.org/10.1007/s11356-021-14081-4
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DOI: https://doi.org/10.1007/s11356-021-14081-4