Analytical modelling of electrical impedance based adulterant sensor for aqueous sucrose solutions

作者：Chakraborty Subhadip; Das Chirantan; Bera Nirmal Kumar; Chattopadhyay Dipankar; Karmakar Anupam; Chattopadhyay Sanatan^*

来源：Journal of Electroanalytical Chemistry, 2017, 784: 133-139.

DOI：10.1016/j.jelechem.2016.11.055

• DI water-sucrose
• Adulteration
• Dipole interactions
• Effective dielectric constant
• Impedance spectroscopy

An analytical model is developed to describe the dielectric behaviour of pure DI water-sucrose solution in which sodium carbonate (Na2CO3) is added as an adulterant. Relative impact of constituent dipoles has been emphasized and multi-body dipolar interactions have been explicitly considered for a comprehensive analysis of such a system in thermal equilibrium. The theoretical model is verified with experimental data obtained from the impedance and capacitance based spectroscopic measurements. The impedance and capacitance of DI water-sucrose solution are observed to vary in a quasi-oscillatory nature with different sucrose content in it. However, such variation shows a decreasing trend and linear nature for a minimum of 1% adulterant content. The system impedance decreases and capacitance increases with increasing adulterant Wt% for a given sucrose concentration. For the 0% of adulterant in the solution with varying sucrose content, the impedance and capacitance have varied from 140.12 k Omega to 236.17 k Omega and 40.7 pF to 44.2 pF, respectively. However, such values change from 111 Omega to 157 k Omega and 42.5 pF to 72 mu F for the adulterant content up to 5%.

• 出版日期2017-1-1