School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China.
Mikrochim Acta. 2021 Jan 6;188(1):18. doi: 10.1007/s00604-020-04686-w.
A new method based on coordination polymer nanoparticles (CPNs) derived from nucleotides and Tb ions (GMP/Tb) for the selective and sensitive determination of aqueous 2,4,6-trinitrophenol (TNP) (picric acid) is established. The fluorescence of GMP/Tb nanoparticles is effectively quenched by TNP via photo-induced charge transfer (PCT), thus achieving its selectivity toward TNP over other nitroaromatic explosives. The decreased fluorescence of GMP/Tb shows a good linear relationship to the concentrations of TNP ranging from 5.0 to 40.0 μM, and the limit of detection is 26.0 nM (5.96 ppb). The proposed GMP/Tb probe also achieves satisfactory results in real samples. The obtained recoveries of this method in river water samples are in the range 93.15-106.10%. The relative standard deviation (RSD) are 0.57 to 1.01% based on three repeated determinations. This fabricated detector provides a feasible path for determination of ppb-level TNP in natural water samples, which can help humans to avoid TNP-contaminated drinking water. Graphical abstract.
基于核苷酸和铽离子（GMP/Tb）衍生的配位聚合物纳米粒子（CPNs）的新方法被建立，用于选择性和灵敏地测定水中的 2,4,6-三硝基苯酚（TNP）（苦味酸）。TNP 通过光诱导电荷转移（PCT）有效地猝灭 GMP/Tb 纳米粒子的荧光，从而实现其对 TNP 的选择性，超过其他硝基芳香族爆炸物。GMP/Tb 的荧光降低与 TNP 的浓度在 5.0 至 40.0 μM 范围内呈现良好的线性关系，检测限为 26.0 nM（5.96 ppb）。所提出的 GMP/Tb 探针在实际样品中也取得了令人满意的结果。该方法在河水样品中的回收率在 93.15%至 106.10%范围内。基于三次重复测定，相对标准偏差（RSD）为 0.57%至 1.01%。这种制备的探测器为测定天然水样中的 ppb 级 TNP 提供了可行的途径，可以帮助人类避免 TNP 污染的饮用水。
