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A Comparison of Glass and Quinhydrone Electrodes for Determining the pH of Some Iowa Soils: II. The Variability of Results 1
Author(s) -
Dean Harold L.,
Walker R. H.
Publication year - 1935
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1935.00021962002700070003x
Subject(s) - citation , soil water , library science , glass electrode , psychology , chemistry , computer science , reference electrode , environmental science , electrode , soil science , electrolyte
I the first paper of this series (1) 3, results were presented of experiments conducted to determine the suitability of different types of glass electrodes for measuring the pH of soils. It was found that similar results were obtained with each of the four types of glass electrodes studied, and that the variability in pH of replicate samples of soil was extremely small with each type of glass electrode. The modified bulb, silver-silver chloride type of glass electrode, however, was found most practicable and desirable because of its ease of construction, strength, durability, and also because of the simplicity of keeping it in proper condition for use. 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 indicated that these electrodes may be depended upon to give accurate results. The next problem in the comparison of glass and quinhydrone electrodes was to determine the normal’variation of results of pH determinations made by the two methods. It seemed desirable also to determine, for the soils under observation, the nature and magnitude of the "QH error" and the "QH electrode error" by means of the glass electrode. The data obtained in these studies are presented in this paper.