Intercomparison of definitive method for pH measurement

Project Description

1. Comparison of buffer materials 1:3,5 primary phosphate buffer
2. Comparison of buffer Potassium hydrogen phthalate (RVS)

A batch of buffer material is produced and divided between the collaborating laboratories.

The pH value is determined using a comparison hydrogen electrode cell at Merck and hydrogen electrode systems at PTB, University of Milano, OMH, GUM and Radiometer.

The pH value is determined at 15 °C, 25 °C and 37 °C.

Final Report 1994-04-30

The comparison has been finished and results are published in Metrogia

Metrology in Chemistry (MC)
Petra Spitzer, PTB (Germany)
Coordinating Institute
PTB (Germany)
Participating Partners
DFM (Denmark)
GUM (Poland)
Further Partners
IT (University Mailand)
Merc KG aA (Germany)