Jiangxi Key Laboratory of Organic Chemistry, Jiangxi Science and Technology Normal University, Nanchang 330013, China.
Anal Chim Acta. 2013 Dec 17;805:87-94. doi: 10.1016/j.aca.2013.10.054. Epub 2013 Nov 9.
A highly selective and sensitive fluorescent chemosensor suitable for practical measurement of palladium ion (Pd(2+)) in agricultural crops and environment samples has been successfully fabricated using polybenzanthrone (PBA). PBA was facilely electrosynthesized in the mixed electrolyte of acetonitrile and boron trifluoride diethyl etherate. The fluorescence intensity of PBA showed a linear response to Pd(2+) in the concentration range of 5 nM-0.12 mM with a detection limit of 0.277 nM and quantification limit of 0.925 nM. Different compounds existing in agricultural crops and environment such as common metal ions, anions, natural amino acids, carbohydrates, and organic acids were used to examine the selectivity of the as-fabricated sensor, and no obvious fluorescence change could be observed in these interferents and their mixtures. A possible mechanism was proposed that the coordination of PBA and Pd(2+) enhance the aggregation of polymer chains, which led to a significant quenching of PBA emission, and this was further confirmed by absorption spectra monitoring and transmission electron microscopy. The excellent performance of the proposed sensor and satisfactory results of the Pd(2+) determination in practical samples suggested that the PBA-based fluorescent sensor for the determination of Pd(2+) will be a good candidate for application in agriculture and environment.
一种高选择性和高灵敏度的荧光化学传感器，适用于农业作物和环境样品中钯离子（Pd(2+)）的实际测量，已成功使用聚苯并蒽酮（PBA）制备。PBA 在乙腈和三氟化硼乙醚的混合电解质中易于电化学合成。PBA 的荧光强度对 Pd(2+)在 5 nM-0.12 mM 的浓度范围内呈线性响应，检测限为 0.277 nM，定量限为 0.925 nM。在农业作物和环境中存在的不同化合物，如常见的金属离子、阴离子、天然氨基酸、碳水化合物和有机酸，用于检验所制备传感器的选择性，在这些干扰物及其混合物中观察不到明显的荧光变化。提出了一种可能的机制，即 PBA 和 Pd(2+)的配位增强了聚合物链的聚集，导致 PBA 发射的显著猝灭，这通过吸收光谱监测和透射电子显微镜进一步得到证实。所提出传感器的优异性能和实际样品中 Pd(2+)测定的满意结果表明，基于 PBA 的荧光传感器用于测定 Pd(2+)将是农业和环境应用的良好候选者。
