Record Display for the EPA National Library Catalog

RECORD NUMBER: 25 OF 84

OLS Field Name OLS Field Data
Main Title Electrical Effects and the Movement of Water in Soils.
Author Swartzendrube, Dale ; Gairo, Schabtai ;
CORP Author Purdue Univ., Lafayette, Ind. Water Resources Research Center.
Year Published 1970
Report Number TR-13; DI-14-01-0001-1018; OWRR-B-005-IND; 02877,; B-005-IND(1)
Stock Number PB-196 314
Additional Subjects ( Soil water ; Electric potential) ; ( Saturated soils ; Hydraulic gradients) ; Motion ; Kaolinite ; Clay soils ; Montmorillionite ; Zeta potential ; Sands ; Electrodes ;
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB-196 314 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 65p
Abstract
The study deals with electrical streaming potential effects on water movement in the soil. For saturated conditions, the only response was the step change in electrical potential at initiation or cessation of hydraulic flow. The direction and magnitude of this 'E step' were consistent with those of the streaming potential phenomenon. The magnitude of the 'E step' was essentially proportional to the hydraulic gradient. For unsaturated flow, electrical potentials measured during upward entry of water into columns of initially air-dry sand kaolinite showed that as the wet front moved past an electrode, characteristic negative peaks were observed. Electrical potential, water flux, and hydraulic gradient were also studied for saturated water flow through plugs of sodium bentonite at concentrations ranging from 11.5 to 35.1% clay. At the lowest caly content, the relationship between electrical potential and hydraulic gradient, and between water flux and hydraulic gradient were both less than proportional, while at 28.4% clay both relationships were strictly proportional and at 35.1% clay the relationship was more than proportional. (WRSIC abstract)