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United States Department of Agriculture

Agricultural Research Service

Title: N and P Adsorption and Desorption on Ion Exchange Resins under Freeze-Thaw Or Wet-Dry Conditions

Authors
item Mamo, M - UNIV OF NE/LINCOLN
item Renken, R - UNIV OF NE/LINCOLN
item Ginting, D - UNIV OF NE/LINCOLN
item Eghball, Bahman

Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: July 21, 2002
Publication Date: November 1, 2002
Citation: MAMO, M., RENKEN, R., GINTING, D., EGHBALL, B. N AND P ADSORPTION AND DESORPTION ON ION EXCHANGE RESINS UNDER FREEZE-THAW OR WET-DRY CONDITIONS. AMERICAN SOCIETY OF AGRONOMY ABSTRACTS #162706. 2002.

Interpretive Summary: The stability of resins used in organic matter mineralization studies is not well known under various physical environmental conditions. The objective of this study was to measure the changes in N and P adsorption and desorption by resins subjected to freeze-thaw or wet-dry cycles. Mixed bed resins (1:1 anionic-cationic by weight) were subjected to 1, 3, 10, and 30 freeze-thaw or wet-dry cycles. The wet condition was set to field capacity (FC) at 0.33 MPa and the dry condition was set when resins reached 70% FC. Wet resin was kept in forced-air oven at 27 oC for 28 h and rewetted to FC for 20 h. Resin at FC was frozen for 16 h and thawed to room temperature for 8 h daily. Alternating and prolonged cycles of freeze-thaw or wet-dry did not change the stability of resin. Freeze-thaw cycles did not induce N and P desorption from resin, however, wet-dry cycles induced desorption of N and P associated with shrinkage of resins and expulsion of interstitial liquid. Scanning electron microscopy revealed that environmental conditions did not physically alter the surface of these resins.

Technical Abstract: The stability of resins used in organic matter mineralization studies is not well known under various physical environmental conditions. The objective of this study was to measure the changes in N and P adsorption and desorption by resins subjected to freeze-thaw or wet-dry cycles. Mixed bed resins (1:1 anionic-cationic by weight) were subjected to 1, 3, 10, and 30 freeze-thaw or wet-dry cycles. The wet condition was set to field capacity (FC) at 0.33 MPa and the dry condition was set when resins reached 70% FC. Wet resin was kept in forced-air oven at 27 oC for 28 h and rewetted to FC for 20 h. Resin at FC was frozen for 16 h and thawed to room temperature for 8 h daily. Alternating and prolonged cycles of freeze-thaw or wet-dry did not change the stability of resin. Freeze-thaw cycles did not induce N and P desorption from resin, however, wet-dry cycles induced desorption of N and P associated with shrinkage of resins and expulsion of interstitial liquid. Scanning electron microscopy revealed that environmental conditions did not physically alter the surface of these resins.

Last Modified: 12/20/2014
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