Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, 7-1 Kioi-Cho, Chiyoda-Ku, Tokyo, 102-8554, Japan.
Anal Sci. 2023 Jul;39(7):1073-1080. doi: 10.1007/s44211-023-00316-6. Epub 2023 Mar 17.
A simple and practical method for boron detection in water is desired in various fields such as seawater desalination, water conservation, and plant production. To develop a method for detecting boron as boric acid in water, we synthesized [Ru(acac)(Hthap)] (acac = acetylacetonat ion, thap = 2',3',4'-trihydroxyacetophenonate (gallacetophenonate) ion) possessing a cis-diol moiety that interacts with boric acid. A comparison of UV-visible (UV-vis) absorption spectra measured in the presence and absence of boric acid at various pH values revealed that [Ru(acac)(Hthap)] shows the highest response to boric acid at pH 8.5. Cyclic voltammograms (CVs) and differential pulse voltammograms (DPVs) of [Ru(acac)(Hthap)] aqueous solution at pH 8.5 with varying boric acid concentrations showed a decrease in the peak current value at 0.032 V (vs. Ag|AgClaq.) and an increase in the peak current value at 0.444 V with increasing boric acid concentration. On the basis of the relationship between the ratio of current values (at 0.032 V and 0.444 V) and boric acid concentrations, the binding constant (assuming a 1:1 binding model) for the interaction between [Ru(acac)(Hthap)] and boric acid was estimated to be 135.1 ± 9.1 mol dm, and the Limit of Detection (LOD) was calculated to be 1.03 mg B L.
在海水淡化、节水和植物生产等各个领域，都需要一种简单实用的水中硼检测方法。为了开发一种检测水中硼酸的方法，我们合成了[Ru(acac)(Hthap)]（acac=乙酰丙酮离子，thap=2'，3'，4'-三羟基苯乙酮（gallacetophenonate）离子），该物质具有顺二醇部分，可与硼酸相互作用。在不同 pH 值下，比较存在和不存在硼酸时的紫外-可见（UV-vis）吸收光谱表明，[Ru(acac)(Hthap)]在 pH 8.5 时对硼酸的响应最高。在 pH 8.5 下，随着硼酸浓度的变化，[Ru(acac)(Hthap)]水溶液的循环伏安图（CV）和差分脉冲伏安图（DPV）显示，在 0.032 V（相对于 Ag|AgClaq.）处的峰值电流值降低，而在 0.444 V 处的峰值电流值增加。基于电流值（在 0.032 V 和 0.444 V 处）与硼酸浓度之间的关系，[Ru(acac)(Hthap)]与硼酸相互作用的结合常数（假设为 1:1 结合模型）估计为 135.1±9.1 mol dm，检出限（LOD）计算为 1.03 mg B L。
