Measurement 90 (2016) 110–117 Contents lists available at ScienceDirect Measurement journal homepage: www.elsevier.com/locate/measurement Electrocapillary measurements by drop-time technique: Comparison of calibration methods Rouvim Kadis , Anna Chunovkina D. I. Mendeleyev Institute for Metrology, 19 Moskovsky pr., 190005 St. Petersburg, Russian Federation ar ti c l e i nf o ab stra ct Article history: This paper considers the drop-time technique in electrocapillary measurements and focuses on calibra- Received 12 March 2015 tion methods required to convert the drop-time t of a mercury electrode into the value of the interfacial Received in revised form 12 March 2016 tension c. The relationships between t and c, described in the literature, are reviewed and six calibration Accepted 6 April 2016 methods identiﬁed. On the basis of high-precision drop-time electrocapillary measurements carried out Available online 30 April 2016 in 0.1 mol l KCl aqueous solution, with c values known from the absolute measurement method, the performance of the calibration methods, expressed in terms of measurement bias and uncertainty, is Keywords: evaluated and compared. Better performance is observed for the methods that involve a nonlinear model Electrocapillary measurement such as c ¼ at ﬁtted to calibration data, instead of a single-point linear calibration commonly
Measurement – Elsevier
Published: Aug 1, 2016
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