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Related Experiment Video

Updated: May 11, 2026

Automated 90Sr Separation and Preconcentration in a Lab-on-Valve System at Ppq Level

Automated ⁹⁰Sr Separation and Preconcentration in a Lab-on-Valve System at Ppq Level

Published on: June 6, 2018

Automated high precision secondary pH measurements.

F Bastkowski¹, P T Jakobsen, F Stefan

¹Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany. frank.bastkowski@ptb.de

The Review of Scientific Instruments

|May 3, 2013

Summary

This summary is machine-generated.

A new automated system achieves high-precision secondary pH measurements with an uncertainty better than 0.005 pH units. This method utilizes a novel thermostatted PFA cell and a flow-through design for accurate and efficient analysis.

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Area of Science:

Analytical Chemistry
Metrology

Background:

Accurate pH measurements are critical in various scientific and industrial applications.
Existing methods can be time-consuming and prone to variability.
Developing automated, high-precision pH measurement systems is essential for reliable results.

Purpose of the Study:

To develop and validate a new setup for automated secondary pH measurements.
To achieve a standard uncertainty in pH better than 0.005 using primary buffers as standards.
To establish a reference measurement procedure for interlaboratory comparisons.

Main Methods:

Development of a one-piece, thermostatted PFA cell with an integrated glass electrode.
Implementation of a flow-through principle for reduced sample consumption.
Utilizing a symmetric measurement sequence and two-point calibration.
Testing in interlaboratory comparisons with standard buffers at 25°C and 37°C.

Main Results:

A standard uncertainty in pH better than 0.005 was achieved.
The PFA cell design facilitated complete emptying and low solution consumption.
Precise temperature control by the tempering unit contributed to low uncertainty.
The system demonstrated high precision and accuracy in interlaboratory comparisons.

Conclusions:

The developed automated setup provides a reliable method for high-precision secondary pH measurements.
The novel PFA cell and precise temperature control are key to achieving low uncertainty.
This system offers an efficient and accurate approach for pH metrology.