A microcapillary manipulation system combined with fluorescence microspectroscopy enabled us to analyze mass transfer in a single particle. In this study, we revealed the Eu(III) distribution in a single diglycolamide-derivative extractant (TODGA)-impregnated polymer-coated silica particle. The reaction of Eu(III) with two TODGA molecules in the polymer layer was the rate-limiting process, which was revealed by the relationship between the rate constants (k1 and k-1) and concentrations of Eu(III) and HNO3. The decrease in the crosslinking degree of the polymer layer caused an increase in only k-1. This indicates that hydrophilic environments at lower crosslinking degrees enhance the stability of the charged Eu(III) species such as Eu3+, Eu(NO3)2+, and Eu(NO3)2+.

中文翻译：

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使用荧光显微光谱法在单个 N,N,N',N'-四辛基二甘醇酰胺浸渍的聚合物涂覆的二氧化硅颗粒中转移 Eu(III)：转移机制和聚合物交联度的影响。

微毛细管操纵系统与荧光显微光谱学相结合，使我们能够分析单个颗粒中的传质。在这项研究中，我们揭示了单一二甘醇酰胺衍生物萃取剂 (TODGA) 浸渍的聚合物涂层二氧化硅颗粒中的 Eu(III) 分布。Eu(III)与聚合物层中两个TODGA分子的反应是限速过程，通过速率常数(k1和k-1)与Eu(III)和HNO3浓度之间的关系揭示了这一过程。聚合物层交联度的降低仅导致k-1增加。这表明，较低交联度的亲水环境增强了带电Eu(III)物质的稳定性，例如Eu3+、Eu(NO3)2+和Eu(NO3)2+。