Kong Yafang, Shen Jianguo, Fan Aiping
School of Pharmaceutical Science and Technology, Tianjin University.
School of Electronic Information Engineering, Tianjin University.
Anal Sci. 2017;33(8):925-930. doi: 10.2116/analsci.33.925.
In the present study, we found that phenylboronic acid derivatives including benzene-1,4-diboronic acid (BDBA) and mercaptophenyl boronic acid (MPBA) can induce the aggregation of citrate-capped gold nanoparticles (Au NPs). However, the speed of Au NP aggregation induced by MPBA was much faster than that of BDBA. The reaction between MPBA and Hg ions resulted in the formation of MPBA-Hg-MPBA, which was similar to BDBA having two free boronic acid groups. Based on the above phenomenon, a sensitive and selective colorimetric method for the detection of mercury ions (Hg) in aqueous solution was developed. The linear range for the detection of Hg ions was from 0.08 to 1.25 μmol dm with a detection limit of 37 nmol dm. The strategy offered excellent selectivity toward Hg against other metal ions. Meanwhile, this simple and cost-effective sensor was applied to determine the Hg in the lake water samples with satisfactory recoveries (91.3 - 100.7%).
在本研究中，我们发现包括苯 - 1,4 - 二硼酸（BDBA）和巯基苯硼酸（MPBA）在内的苯基硼酸衍生物能够诱导柠檬酸盐包覆的金纳米颗粒（Au NPs）聚集。然而，MPBA诱导Au NPs聚集的速度比BDBA快得多。MPBA与汞离子之间的反应导致形成MPBA - Hg - MPBA，这与具有两个游离硼酸基团的BDBA类似。基于上述现象，开发了一种用于检测水溶液中汞离子（Hg）的灵敏且选择性的比色法。检测汞离子的线性范围为0.08至1.25 μmol dm，检测限为37 nmol dm。该策略对汞具有优于其他金属离子的出色选择性。同时，这种简单且经济高效的传感器被应用于测定湖水样品中的汞，回收率令人满意（91.3 - 100.7%）。
