Abstract
The interactions of polyacrylates (PAs with mean molecular weight of 4.5, 25, and 250 kDa; Na+,pa−) with anion exchange resins in the Br− form (AXRs; -R+,Br−) were studied under practical conditions by reaction stoichiometry and spectroscopy. The stoichiometric or an excess amount of PA(4.5 kDa) completely replaced Br- in the AXRs of the cross-linking degree of 2 or 8%, respectively, to give (-R+,pa−), due to enhancement in selectivity of carboxylate group by multiple interactions. In contrast, PA(250 kDa) exchanged Br− only on the surface of AXRs and did not penetrate into the resins; CO2 was involved in the system to induce exchange with CO32−. Using the slightly acidic condition caused substantially no exchange by CO32− but induced coextraction of PA with proton as free Hpa. PA(4.5 kDa) once penetrating into the resin phase as (-R+,pa−) or free Hpa was reversibly eluted under the appropriate conditions.
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Acknowledgments
We thank JASCO support for the IR measurement of the resin surface by ATR method. This work was supported by JSPS KAKENHI Grant Numbers JP23550093 and JP26410148.
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Tauchi, H., Sakai, Y., Okawa, N. et al. Interactions of Anion-Exchange Resins with Polyacrylates in Atmosphere. ANAL. SCI. 32, 1071–1075 (2016). https://doi.org/10.2116/analsci.32.1071
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DOI: https://doi.org/10.2116/analsci.32.1071