铈离子与焦磷酸根离子配位聚合物网络用于草甘膦快速荧光检测

本文基于铈离子与焦磷酸根离子 (Ce-PPi) 配位聚合物网络 (coordination polymer networks，CPNs) 开发出一种草甘膦快速检测方法。通过铈离子 (Ce3+) 与焦磷酸根离子 (PPi) 之间的配位作用，自组装合成出Ce-PPi CPNs，并对其结构和性质进行了表征。草甘膦可以减弱PPi与Ce3+ 之间的配体场效应，导致Ce-PPi CPNs的荧光减弱。基于这一原理，通过优化条件，实现了草甘膦的定量检测，R2为0.9972，检出限为0.014 μmol/L。该方法检测灵敏度较高，且对草甘膦具有优异的选择性，可应用于自来水与苹果样品中草甘膦的检测，方法定量限为0.05 mg/kg，回收率在77%~87%之间，为草甘膦的快速、现场和实时实际样品检测提供了新的选择。

Cerium ion (Ce3+) and pyrophosphate ion coordination polymer networks for the rapid fluorometric detection of glyphosate

A rapid fluorometric method was established to detect glyphosate by using cerium ion and pyrophosphate ion (Ce-PPi) coordination polymer networks (CPNs). Based on coordination of cerium ion (Ce3+) and pyrophosphate ion (PPi), fluorescent Ce-PPi CPNs were synthesized by simple self-assemble process, and the structure and properties were characterized. Upon introducing glyphosate, the ligand field effect of PPi with Ce3+ was weakened resulting in a decrease in fluorescence of Ce-PPi CPNs. Based on this principle, the quantitative detection of glyphosate was achieved by optimizing the conditions, with R2 of 0.9972 and the detection limit of 0.014 μmol/L. The established method based on Ce-PPi CPNs possessed outstanding sensitivity and exclusive selectivity for rapid detction of glyphosate, and could be used for the detection of glyphosate in tap water and apple samples. The limit of quantitation (LOQ) was 0.05 mg/kg and the recoveries were between 77% and 87%. The method provided a potential choice for the rapid, on-site and real-time, detection of glyphosate.