Determination of pH by the Glass Electrode: pH Meter Calibration for Gastric Analysis

Determination of vaginal pH by pH indicator strip and by pH micro electrode.

Vaginal pH measurement is a screening method of vaginal infection in pregnancy. We tested two different methods of pH determination. In freshly taken vaginal fluid measurements were carried out with special pH indicator strips and pH micro glass electrode. About 100 microliters of vaginal fluid is enough when pH indicator strips are used, and 200 microliters when the micro electrode is used. Th...

The Youden pH Meter

Sørensen used a slide-wire potentiometer to make his pH measurements. Here a known potential is applied to counterbalance the potential of the hydrogen cell (i.e. the hydrogen electrode plus the counter electrode) and to reduce its current output to zero, at which point the value of the applied counter-potential is equal to that of the cell potential. Since the point of balance is indicated by...

Development of the Glass Electrode and the pH Response

The glass electrode is the most commonly used device to access the pH of an aqueous solution. It attains highly accurate measurements via simple and well-established procedures. However, the reasons why the glass electrode potential scales with hydrogen ion concentration according to almost Nernstian potential values have been long-standing challenges to explain. Only in the past 50 years has a...

pH Measurement with the Glass Electrode and Vacuum Tube Potentiometer.

Analysis of Acid Papers by Non-Aqueous Solvent Extraction- Spectrophotometry and Upside-down pH Glass Electrode

Non-aqueous solvent extraction of acid in papers is described; the process employs a liquid ion-exchanger in chloroform. The amounts of the acid in the so-called acid paper are determined by the normal method of aqueous extraction and by the organic solvent extraction and the values are compared. The results of investigation confirm that the acid content of the acid paper must be determined by ...