SOIL MOISTURE CHARACTERISTICS BY OSMOSIS WITH POLYETHYLENE GLYCOL: A SIMPLE SYSTEM WITH OSMOTIC PRESSURE DATA AND SOME RESULTS

THE USE OF POLYETHYLENE GLYCOL (PEG) SOLUTIONS TO EXTRACT WATER FROM SOIL BY OSMOSIS MAKES IT POSSIBLE TO OBTAIN MOISTURE RELEASE CURVES OVER A WIDE SUCTION RANGE WITH A SINGLE SYSTEM. MATRIC SUCTIONS---MATRIC POTENTIAL EXPRESSED ON A UNIT VOLUME BASIS WITH THE SIGN REVERSED, I.E., NEGATIVE POTENTIAL IS POSITIVE SUCTION---UP TO 25 BARS ARE EASILY OBTAINED WITH PEG-6000 DIALYZING TUBING SYSTEMS. UNITS ARE DESCRIBED, MADE WITH SIMPLE, INEXPENSIVE, OFF-THE- SHELF LABORATORY EQUIPMENT WHICH WHEN USED WITH A TABLE OF OSMOTIC PRESSURES GIVEN IN THE ARTICLE, PROVIDE A SINGLE SYSTEM FOR DETERMINING MOISTURE CHARACTERISTICS FROM 0.16 TO 24.8 BARS WITHOUT RESORT TO EXPENSIVE PRESSURE AND SUCTION DEVICES AND THEIR ASSOCIATED PRESSURE SOURCES, VALVES, REGULATORS, AND GAGES. THE DESIGN OF AN OSMOTIC EXTRACTION UNIT AND OF AN OSMOMETER FOR DETERMINING PEG-6000 OSMOTIC PRESSURE IS SHOWN IN DETAIL IN FIGURES, AND PROCEDURES FOR THEIR USE ARE DESCRIBED IN THE TEXT. THE CHARACTERISTICS OF FIVE MINERAL SOIL AND ONE ORGANIC SOIL ARE PLOTTED AS WATER CONTENT AGINST MATRIC SUCTION.

  • Supplemental Notes:
    • Vol 110, No 6, PP 401-404, 3 FIG, 1 TAB, 4 REF
  • Authors:
    • Waldron, L J
    • Manbeian, T
  • Publication Date: 1970-12

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Filing Info

  • Accession Number: 00237943
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 1 1971 12:00AM