Characterizing Soil Oxygen Conditions With A Platinum Microelectrode
1964; Elsevier BV; Linguagem: Inglês
10.1016/s0065-2113(08)60026-7
ISSN2213-6789
Autores Tópico(s)Electrochemical Analysis and Applications
ResumoThis chapter discusses the application of polarographic principles to measure oxygen diffusion rates (ODR) in the soil water system. When a certain electrical potential is applied between the platinum electrode inserted in the soil and a reference electrode, oxygen is reduced at the platinum surface. The platinum microelectrode method of measuring soil oxygen conditions has several advantages over other methods that make it a valuable tool for field studies. One important feature is its portability as well as its inexpensiveness and simple electronic circuit. The rate of oxygen diffusion to a platinum wire that could represent a plant root is the factor measured. The chapter investigates ODR in relation to root growth for several plant species. The platinum microelectrode technique fails to properly characterize the soil oxygen conditions of relatively dry soils. This problem is most likely associated with the failure of the electrode to be completely wet. Temperature influences the ODR. The results of measurements at various soil temperatures indicate that differences in ODR are associated with the effect of temperature on oxygen solubility and diffusion coefficient.
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