Ycl3 6h2o

YCl₃·6H₂O (99.99%), YbCl₃·6H₂O (99.99%), ErCl₃·6H₂O (99.99%), oleic acid (90% technical grade), and NaOH (98%) were purchased from Sigma-Aldrich. 1-octadecene (ODE, 90% technical grade) and NH₄F (99.99%) were obtained from Alfa Aesar. Chloroform, cyclohexane, acetone, and ethanol were purchased from Carl Roth GmbH. Low-price Ln-chlorides were puchased from XI’AN FUNCTION MATERIAL GROUP. All chemicals were used without further purification.

All rare earth chloride hexahydrates (YCl₃·6H₂O, ErCl₃·6H₂O, GdCl₃·6H₂O and YbCl₃·6H₂O) obtained from Sigma-Aldrich are 99% pure. Ammonium fluoride (NH₄F), sodium hydroxide (NaOH), alendronic acid (ADA), 1-(3-Dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC), hydrogen tetrachloroaurate hydrate (HAuCl₄·3H₂O), N-Hydroxysuccinimide (NHS), succinic anhydride, and other reagents were purchased from Alfa Aesar (Shanghai, China). All aptamers were obtained from Sangon Biotechnology Ltd. (Shanghai, China). The sequence of Shigella aptamer is as follows: 5′-SH-CCG GAC TAG GGC TGG TTA GCT TCA ATA CTG CTG GGC GAG G-3′ (apt1) and 5′-NH₂-GGC CTG ATC CCG ACC AAT CGA AGT TAT GAC GAC CCG CTC C-3′ (apt2). All foodborne pathogens used in the experiment were supplied by Nanjing Agricultural University.

YCl₃·6H₂O (99.99%), YbCl₃·6H₂O (99.9%), TmCl₃ (99.9%), oleic acid (≥99%), 1-octadecene (≥95.0%), sodium hydroxide (97%), and ammonium fluoride (≥98%) were purchased from Sigma-Aldrich and used without further purification. 1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[carboxy(polyethylene glycol)-2000] (DSPE-PEG-COOH) was purchased from Nanocs Inc. (New York, NY, USA).

2,6-Bis(1-(2-ethylhexyl)-1H-1,2,3-triazol-4-yl)pyridine
(PTEH) was supplied by the University of Parma (Department
of Chemistry, Life Sciences and Environmental Sustainability) and
synthesized according to the procedure elsewhere reported.^{24 (link)}All commercially available reagents and
chemicals used in this study were analytical reagent grade and used
without further purification. Kerosene (reagent grade, low odor, aliphatic
fraction >95%) and 1-octanol (purity ≥99%), both supplied
by
SIGMA-Aldrich, were used as diluents. The organic solutions were prepared
by dissolving weighed amounts of PTEH extractant in mixtures
of kerosene + 10 vol % 1-octanol.
Nitric acid solutions were
prepared by diluting concentrated nitric
acid (from Fluka, ≥65% w/w) with ultrapure water (Millipore,
Billerica, USA; 18.2 MΩ·cm). The stock solution of ²⁴¹Am was supplied by Eurostandard CZ (Czech Republic), and
the radiotracers ¹⁵²Eu and ²⁴⁴Cm were supplied
by CERCA-LEA (France). Hexahydrated nitrates of La, Ce, Pr, Nd, Sm,
Eu, and Gd (purity from 99 to 99.99%) and YCl₃·6H₂O (99.8%), purchased from Sigma-Aldrich, were used to prepare
simplified synthetic feed stock solutions in HNO₃ at different
concentrations.

All reagents and solvents were of analytical reagent grade and were used without further purification. Oxolinic acid, YCl₃·6H₂O, LaCl₃, EuCl₃·6H₂O, GdCl₃·6H₂O, SmCl₃·6H₂O, TbCl₃·6H₂O, human transferrin, human serum albumin and double-stranded calf-thymus DNA were purchased from Sigma Aldrich Chemical Co. (Schnelldorf, Germany). The following abbreviations were used to designate signal intensity: b = broad, w = weak, m = medium, s = sharp.