The influence of error structure on interpretation of impedance spectra

• Published in: Electrochimica acta Vol. 41; no. 7; pp. 1017 - 1022
• Main Authors: Agarwal, Pankaj, Orazem, Mark E., Garcia-Rubio, Luis H.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier Ltd 01.05.1996; Elsevier
• Subjects: Chemistry; electro-hydrodynamic impedance; Electrochemistry; Exact sciences and technology; General and physical chemistry; impedance spectroscopy; mass transfer; modeling; statistics; Study of interfaces; Transport phenomena; impedance spectroscopy; modeling; mass transfer; electro-hydrodynamic impedance; statistics; Statistical analysis; Hexacyanoferrates; Error estimation; Bias; Random error; Experimental study; Mass transfer; Transport process; Chemical reduction; Platinum; Potassium Chlorides; Mathematical model; Electrochemical reaction; Electrohydrodynamics; Disk electrode; Electrical impedance
• ISSN: 0013-4686; 1873-3859
• DOI: 10.1016/0013-4686(95)00433-5

The influence of error structure on interpretation of impedance measurements is demonstrated for electro-hydrodynamic impedance spectra. The stochastic component of the error structure was determined through use of measurement models, and a three-parameter model for the error structure was identified. The measurement model was also used to identify portions of the impedance spectra that were not corrupted by bias errors. Regression employing weighting by the stochastic component of the error structure yielded unambiguous values for physical properties such as the Schmidt number, whereas significant ambiguity was observed using modulus or proportional weighting.