de.mpg.escidoc.pubman.appbase.FacesBean
English
 
Help Guide Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Traceability of pH measurements by glass electrode cells: performance characteristic of pH electrodes by multi-point calibration

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons48487

Naumann,  Renate
MPI for Polymer Research, Max Planck Society;

Locator
There are no locators available
Fulltext (public)
There are no public fulltexts available
Supplementary Material (public)
There is no public supplementary material available
Citation

Naumann, R., Alexander-Weber, C., Eberhardt, R., Giera, J., & Spitzer, P. (2002). Traceability of pH measurements by glass electrode cells: performance characteristic of pH electrodes by multi-point calibration. Analytical and Bioanalytical Chemistry, 374(5), 778-786.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-64C2-1
Abstract
Routine pH measurements are carried out with pH meter-glass electrode assemblies. In most cases the glass and reference electrodes are thereby fashioned into a single probe, the so- called 'combination electrode' or simply 'the pH electrode'. The use of these electrodes is subject to various effects, described below, producing uncertainties of unknown magnitude. Therefore, the measurement of pH of a sample requires a suitable calibration by certified standard buffer solutions (CRMs) traceable to primary pH standards. The procedures in use are based on calibrations at one point, at two points bracketing the sample pH and at a series of points, the so- called multi-point calibration. The multi-point calibration (MPC) is recommended if minimum uncertainty and maximum consistency are required over a wide range of unknown pH values. Details of uncertainty computations for the two-point and MPC procedure are given. Furthermore, the multi-point calibration is a useful tool to characterise the performance of pH electrodes. This is demonstrated with different commercial pH electrodes. Electronic supplementary material is available if you access this article at http://dx.doi.org/10.1007/s00216- 002-1506-5. On that page (frame on the left side), a link takes you directly to the supplementary material.