Coated NPK Fertilizer Based on Citric Acid-Crosslinked Chitosan/Alginate Encapsulant
 
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1
Chemistry Department, College of Science, De La Salle University, 2401 Taft Avenue, Manila 0922, Philippines
2
Department of Chemistry, National Sun Yat-sen University, Kaohsiung, Taiwan
3
1Chemistry Department, College of Science, De La Salle University, 2401 Taft Avenue, Manila 0922, Philippines
CORRESPONDING AUTHOR
David Jr P Penaloza   

1Chemistry Department, College of Science, De La Salle University, 2401 Taft Avenue, Manila 0922, Philippines
Publish date: 2019-12-01
 
J. Ecol. Eng. 2019; 20(11):1–12
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ABSTRACT
A coated nitrogen-phosphorus-potassium (NPK) fertilizer was prepared via crosslinking chitosan and alginate using citric acid. Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), particle size analysis, and zeta potential measurement showed the successful crosslinking, appropriate size, and colloidal stability of the coated NPK fertilizer. The encapsulation capability of the crosslinked chitosan/alginate (Chi/Alg) was studied using fluorescence spectroscopy and NPK analysis. The release behavior studies under various pH conditions showed that Chi/Alg NPK conformed to the standards of controlled release fertilizer with a maximum release rate of 40% for 30 days. The investigation of the release mechanism using Korsemeyer-Peppas mathematical model showed that the release of nutrients is governed by both coating material relaxation and diffusion process.