Abstract
Ion exchanges by aromatic anions (AAs) of varying volumes on anion exchange resins of different cross linking (CL)- degrees were studied. The exchanges on the resins with low CL-degrees having the larger and the less independent exchange sites proceeded fast and completely at a high AA concentration; the selectivity coefficient increased with the progress of the exchange, due to the cooperative interaction between exchanged AAs. In contrast, in the exchanges on the resins with a CL-degree of 8% having the smaller (more specifically, having the average volume of 300 Å3 with a variance) and the more independent exchange sites, the large AA may not enter the exchange sites having sizes smaller than the volume of AA to cause mid-saturation of ion exchange and to increase the reaction time because of the need for detouring; the selectivity coefficients were substantially independent of the progress of the exchange, due to the isolation of each AA.
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This work was supported by JSPS KAKENHI Grant Number 26410148
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Yonesaka, T., Yagi, S., Yasui, T. et al. Slow, Mid-saturated Exchanges by Large Anions on Resins due to Increase in Independency of Exchange Sites with Cross-Linking. ANAL. SCI. 35, 1327–1331 (2019). https://doi.org/10.2116/analsci.19P200
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DOI: https://doi.org/10.2116/analsci.19P200