Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 123, Issue 4, Pages 2291-2298Publisher
WILEY
DOI: 10.1002/app.34742
Keywords
adsorption; conductimetric measurements; controlled-extended release of fertilizers; polysaccharide hydrogels; swelling degree
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Funding
- Foundation for Research Support of Sao Paulo (FAPESP)
- National Council for Scientific and Technological Development (CNPq-Brazil)
- National Nanotechnology Laboratory for Agriculture (LNNA)-Embrapa Agricultural Instrumentation
- Embrapa-Brazil
- FINEP/LNAA
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This article studied the applicability of poly(acrylamide) and methylcellulose (PAAm-MC) hydrogels as potential delivery vehicle for the controlled-extended release of ammonium sulfate (NH4)(2)SO4 and potassium phosphate (KH2PO4) fertilizers. PAAm-MC hydrogels with different acrylamide (AAm) and MC concentrations were prepared by a free radical polymerization method. The adsorption and desorption kinetics of fertilizers were determined using conductivity measurements based on previously built analytical curve. The addition of MC in the PAAm chains increased the quantities of (NH4)(2)SO4 and KH2PO4 loaded and extended the time and quantities of fertilizers released. Coherently, both loading and releasing processes were strongly influenced by hydrophilic properties of hydrogels (AAm/MC mass proportion). The best sorption (124.0 mg KH2PO4/g hydrogel and 58.0 mg (NH4)(2)SO4/g hydrogel) and desorption (54.9 mg KH2PO4/g hydrogel and 49.5 mg (NH4)(2)SO4/g hydrogel) properties were observed for 6.0% AAm-1.0% MC hydrogels (AAm/MC mass proportion equal 6), indicating that these hydrogels are potentially viable to be used in controlled-extended release of fertilizers systems. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 123: 2291-2298, 2012
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