IHSS&IWA26 / BRNO / CZECHIA / 23–28 August 2026 BOOK OF ABSTRACTS 162 Travel Awardee Presentations Friday, 28 August 2026 / Hall C expansion. Regarding environmental dynamics, the encapsulation selectively retained 93% of the labile organic load by reducing dissolved organic carbon leaching from 296 mg L⁻¹ in the intermediate formulation to 20.8 mg L⁻¹ in the final granule. The increase in spectral indices within the leached fraction supports this retention mechanism. Comparing the precursor CF to the final product, an E2/E3 rise from 2.40 to 4.16 and an S275-295 increase from 0.0078 to 0.0122 nm⁻¹. As conclusion, the AlgCF-KxHyPO4 composite establishes a physical barrier that controls mass transport and retains 93% of labile carbon. These properties support CF valorization as a CRF for tropical soils. Future research requires long-term soil incubation to quantify K and P release kinetics. References 1. Saniso, E. et al. Case Studies in Thermal Engineering, 2025(73), 106634. 2. Borges, B.M.M.N. et al. J. Journal of Cleaner Production, 2020(262), 121406. 3. Li, Y. et al. Journal of Environmental Management, 2025(395), 127955. Acknowledgement The authors thank the International Humic Substances Society (IHSS) for the 2026 Travel Award and the Ronald Malcolm Award granted to H.B.Maia. This study was funded in part by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, Brazil) through grant Process No. 88887.903067/2023-00 awarded to H.B.Maia.
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