<abstract xmlns="http://www.w3.org/1999/xhtml"> With the polymer-coated fertilizer as background, the permeability of P- and K-nutrient through a representative polymer membrane-polystyrene membrane were investigated by measuring their permeability in the solutions of KH2PO4-water and urea-KH2PO4-water at nominal temperature of 298 K using the Ussing chamber method. To analyze and interpret the variation of permeability with solute concentration, the solubility of permeate in polymer membrane were determined experimentally and the permeate diffusion coefficient were assessed by the measurements of density and apparent molar volume of the aqueous fertilizer solutions. An interesting “increase-decrease” trend for the permeability of both phosphorous (P)-nutrient, and potassium (K)-nutrient fertilizer with permeate concentration was observed, in which the increases in permeability at low concentrations of permeate could be attributed to the increase in solubility of KH2PO4 in polymer while the decreases in permeability at high concentrations was due to the decrease in diffusion coefficient of permeate in polymer membrane. Finally, the release kinetics of these nutrients from a PS-coated urea-KH2PO4 compound fertilizer granule was predicted using the Shaviv’s model along with the permeability data of P- and K-nutrient generated.</abstract>

With the polymer-coated fertilizer as background, the permeability of P- and K-nutrient through a representative polymer membrane-polystyrene membrane were investigated by measuring their permeability in the solutions of KH2PO4-water and urea-KH2PO4-water at nominal temperature of 298 K using the Ussing chamber method. To analyze and interpret the variation of permeability with solute concentration, the solubility of permeate in polymer membrane were determined experimentally and the permeate diffusion coefficient were assessed by the measurements of density and apparent molar volume of the aqueous fertilizer solutions. An interesting “increase-decrease” trend for the permeability of both phosphorous (P)-nutrient, and potassium (K)-nutrient fertilizer with permeate concentration was observed, in which the increases in permeability at low concentrations of permeate could be attributed to the increase in solubility of KH2PO4 in polymer while the decreases in permeability at high concentrations was due to the decrease in diffusion coefficient of permeate in polymer membrane. Finally, the release kinetics of these nutrients from a PS-coated urea-KH2PO4 compound fertilizer granule was predicted using the Shaviv’s model along with the permeability data of P- and K-nutrient generated.

Permeability of P and K-nutrient through polystyrene membrane from aqueous solutions of urea + KH2PO4

Polish Journal of Chemical Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Permeability of P and K-nutrient through polystyrene membrane from aqueous solutions of urea + KHPO

With the polymer-coated fertilizer as background, the permeability of P- and K-nutrient through a representative polymer membrane-polystyrene membrane were...

Permeability of P and K-nutrient through polystyrene membrane from aqueous solutions of urea + KH₂PO₄

Online veröffentlicht: 11. Jan. 2019

Seitenbereich: 113 - 122

DOI: https://doi.org/10.2478/pjct-2018-0063

Schlüsselwörter
Permeability, polymer membrane, aqueous fertilizer solution, polymer-coated fertilizer

© 2019 Xiaonan Deng, et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Permeability of P and K-nutrient through polystyrene membrane from aqueous solutions of urea + KH2PO4

Online veröffentlicht: 11. Jan. 2019

Seitenbereich: 113 - 122

DOI: https://doi.org/10.2478/pjct-2018-0063

SchlüsselwörterPermeability, polymer membrane, aqueous fertilizer solution, polymer-coated fertilizer

© 2019 Xiaonan Deng, et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Permeability of P and K-nutrient through polystyrene membrane from aqueous solutions of urea + KH₂PO₄

Schlüsselwörter
Permeability, polymer membrane, aqueous fertilizer solution, polymer-coated fertilizer