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KMID : 0903520040470030344
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Journal of the Korean Society of Agricultural Chemistry and Biotechnology
2004 Volume.47 No. 3 p.344 ~ p.350
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Development of Mixed-bed Ion Exchange Resin Capsule for Water Quality Monitoring
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Yang Jae-E
Park Chang-Jin
Kim Dong-Kuk
Ok Yong-Sik
Ryu Kyung-Ryul
Lee Ju-Young
Zhang Yong-Seon
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Abstract
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This study was conducted to develop and assess the applicability of mixed-bed ion exchange resin capsules for water quality monitoring in small agricultural watershed. Recoveries of resin capsules for inorganic N and P ranged from 96 to 102%. The net activation energies and pseudo-thermodynamic parameters, such as ΔGo‡, ΔHo‡, and ΔSo‡ for ion adsorption by resin capsules, exhibited relatively low values, indicating the process might be governed by chemical reactions such as diffusion. However, those values increased with temperature coinciding with the theory. The reaction reached pseudo-equilibrium within 24 hours for NH4-N and NO3-N, and only 8 hours for PO4-P, respectively. The selectivity of resin capsules were in the order of NO3- > NH4 +> PO4 3?, coinciding with that of encapsulated Amberlite IRN-150 resin. At the initial state of equilibrium, the resin adsorption quantity was linearly proportional to the mass of ions in the streams, but the rate of movement leveled off, following Langmuir-type sorption isotherm. The overall results demonstrated that the resin capsule system was suitable for water quality monitoring in small agricultural watershed, judging from the reaction mechanism(s) of the resin capsule and the significance of model in field calibration.
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KEYWORD
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mixed-bed ion exchange resin capsule, resin adsorption quantity, first order kinetic model
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