Evaluation of a Compact Differential Cell for Secondary pH Measurements by a Bilateral Interlaboratory Comparison |
| |
| Authors: | Fabiano Barbieri Gonzaga Júlio Cesar Dias Diana Jehnert Barbara Werner Karin Schräpler Leoš Vyskočil |
| |
| Affiliation: | 1. Chemical Metrology Division, National Institute of Metrology, Quality and Technology (INMETRO), Av. Nossa Senhora das Gra?as, 50, Xerém, 25250‐020 Duque de Caxias, RJ, Brazil;2. Zentrum für Messen und Kalibrieren ‐ANALYTIK‐ GmbH (ZMK), Areal A, Filmstra?e Nr.? 7, Chemiepark Bitterfeld‐Wolfen, 06766 Wolfen, Germany;3. Slovensky metrologicky ústav (SMU), Karloveská 63, SK 842?55 Bratislava 4, Slovakia |
| |
| Abstract: | This work presents a new differential potentiometric cell for the standardization of pH buffer solutions and its evaluation, by means of a bilateral interlaboratory comparison, in relation to a traditional Baucke cell. The results obtained with the two cells were exactly the same for three of the pH buffer solutions analyzed (1.68, 4.01, and 6.86) and similar to each other for the remaining buffer solution (9.18). The new cell showed an average measurement time of only 21 minutes, in comparison with one to three hours for other cells described in the literature (including the Baucke cell). |
| |
| Keywords: | Differential cell Potentiometry pH Standardization Buffer solution |
|
|
