As(III) is the most harmful substance of all over 20 kinds of arsenic compounds. In addition, the trivalent oxidation state of arsenic is not stable, which can be oxidized to pentavalent arsenic. Thus, it is attractive and challenging to sensitively and selectively monitor As(III) concentration, rather than As(V) concentration, in water. However, most of detection techniques suffer from the inability to distinguish As(III) and As(V), or even need specialized personnel and additional equipment. Herein, novel luminescent Ce(III)-based coordination polymer nanoparticles (Ce-CPNs) have been proposed for selective detection of As(III). The Ce-CPNs are dispersive and show a fluorescence peak at 353 nm under excitation at 280 nm. With the presence of As(III), aggregation of Ce-CPNs occurs, resulting in quenching of the fluorescent Ce-CPNs due to the aggregation-caused π-π stacked layers of Ce-CPNs. Under optimal conditions, the detection limit for As(III) is down to 0.7 ppb. In addition, the Ce-CPNs are selective for As(III) over other ions and has been successfully applied for fluorescence sensing of As(III) in environmental water samples.

As（III）是20多种砷化合物中最有害的物质。另外，砷的三价氧化态不稳定，可以被氧化成五价砷。因此，敏感和选择性地监测水中的As（III）浓度而不是As（V）浓度是有吸引力且具有挑战性的。但是，大多数检测技术都无法区分As（III）和As（V），甚至需要专门的人员和额外的设备。在此，已经提出了新颖的基于Ce（III）的发光配位聚合物纳米颗粒（Ce-CPNs）用于As（III）的选择性检测。Ce-CPNs是分散的，在280 nm激发下在353 nm处显示荧光峰。在存在As（III）的情况下，Ce-CPN发生聚集，由于Ce-CPN的聚集引起的π-π堆叠层，导致荧光Ce-CPN的猝灭。在最佳条件下，As（III）的检出限降至0.7 ppb。此外，Ce-CPNs对As（III）的选择性优于其他离子，并且已成功应用于环境水样品中As（III）的荧光传感。