A comparison of glass and quinhydrone electrodes for determining the pH of some Iowa soils. I. A comparison of different types of glass electrodes
1935
Dean, H.L. | Walker, R.H.
1. A study was made of the adaptability of the glass electrode for determining the hydrogen-ion concentration of soils. 2. A potentiometric setup suitable for use with the glass electrode was described. This included a vacuum tube amplifying unit in combination with a Leeds and Northrup hydrogen-ion potentiometer and other commonly used instruments. 3. Data are presented which show that four different types of glass electrode gave similar results when the hydrogen-ion concentration of soils was determined. The variability in pH of replicate samples of soil was extremely small with each type of electrode. 4. The modified bulb, silver-silver chloride type of electrode was found most practicable and desirable because of its ease of construction, strength, durability, and maintenance. 5. Several glass electrodes of the modified bulb type constructed from one stock of glass were found, in the main, to function similarly, and the data indicate that these electrodes may be depended upon to give accurate results.
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