Hydrazone-derived PET/CHEF fluorescent probes for sensitive detection of cesium and strontium in real samples

. Job's plot analysis confirmed a 1 : 1 binding stoichiometry between the probes and their corresponding metal ions. The NSP- and NFH-functionalized cotton swabs exhibit excellent stability, highlighting their potential for portable and on-site detection. Complementarily, their efficacy was demonstrated in actual samples, including water, soil, and vegetable matrices, achieving excellent recovery results.