ISOLASI ASAM HUMAT DARI TANAH GAMBUT SUMATERA DAN KALIMANTAN DAN ANALISIS KANDUNGAN GUGUS FUNGSIONALNYA
Keywords:humic acid, functional groups, indirect potentiometric titration, hypothetical structure
Humic acid have done isolated from Peat soil of Sumatra and Kalimantan. The purpose of this research were to study the structure of hipotetik humic acid isolated from Sumatra and Kalimantan via FTIR spectrophotometry and analysis of functional groups through indirect titrationpotentiometric method. The FTIR spectra showed that the Sumatera and Kalimantan humic acid had the –COOH, -OH dan –NH groups. The results of titration showed that the value of the total acidity of humic acid isolated from Sumatra and Kalimantan were 710 and 570 cmol kg-1, respectively. The content of carboxyl functional groups were 260 and 300 cmol kg-1, respectively, and the contents of the phenolic hydroxyl group were 450 and275 cmol kg-1, respectively. The content of humic acid functional groups were included in the total acidity range structure of humic acid hypothetical according to Stevenson.
Aiken, G.R., Mcknight, D.M., Wershaw, R.L. (1985). Humic Substances In Soil, Sediment, and Water: Geochemistry, Isolation, and Characterization. John Wiley & Sons.
Stevenson, F.J. (1982). Humus Chemistry Genesis, Composition, Reaction. 1st editon. John Wiley, New York.
Wershaw, R. L., Leenheer, J.A., Kennedy, K.R., Noyes, T. I. (1996). Use of 13C NMR and FTIR for elucidation of degradation pathways during natural litter decomposition and composting 1. Early stage leaf degradation, Soil Sci. 161, 667-679.
Pena-Mendez, E.M., Havel, J., Patocka, J. (2005). Humic substances-compounds of still unknown structure: applications in agriculture, industry, environment, and biomedicine. J. Appl. Biomed. 3, 13–24.
Tan, K.H. (2004). Humic matter in soil and the environmental: Principles and Controversies. Taylor & Francis Group.
Rahmayanti, M., Santosa, S.J., Sutarno. (2016). Comparative Study on the Adsorption of [AuCl4]– onto Salicylic Acid and Gallic Acid Modified Magnetite Particles. Indones. J. Chem. 16 (3), 329 – 337.
Meng, F., Yuan, G., Larson, S.L., Ballard, J.H., Waggoner, c.a., Arslan, Z., dan Han, F.X. (2017). Removing uranium (VI) from aqueous solution with insoluble humic acid derived from leonardite. J. Environ. Radioact, 180, 1-8.
Peng, L., Qin, P., Lei M., Zeng, Q., Song, H. and Yang, J., (2012), Modifying Fe3O4 Nanoparticles with Humic Acid for Removal of Rhodamine B in Water, J. Hazard. Mater., 209, 193-198.
Zhang, X., Zhang, P., Wu, Z., Zhang, L., Zeng, G. and Zhou, C., (2013), Adsorption of Methyene Blue onto Humic Acid-Coated Fe3O4 Nanoparticles, Colloids Surfaces A, 435, 85-90.