RT Journal Article
T1 Bromine speciation by a paper-based sensor integrated with a citric acid/cysteamine fluorescent probe and smartphone detection
A1 Placer Vidal, Lorena
A1 Lavilla Beltran, Maria Isela
A1 Pena Pereira, Francisco Javier
A1 Bendicho Hernandez, Jose Carlos
K1 2301 Química Analítica
AB The present work reports on a sensitive and affordable non-instrumental method for the determination of bromine species in environmental waters by combination of paper-based headspace sampling and smartphone-based fluorescence detection. The proposed approach takes advantage of the luminescence quenching of a probe (5-oxo-3,5-dihydro-2 H-thiazolo[3,2-a]pyridine-7-carboxylic acid, TPCA) derived from natural compounds, namely, citric acid and cysteamine, when exposed to molecular bromine. The decreased luminescence intensity of the probe was attributed to the formation of a dibrominated derivative of TPCA at the detection area of a paper-based analytical device (PAD). Remarkably, PADs modified with the luminescent probe showed excellent stability. Under optimal conditions, the proposed approach showed limits of detection of 5.4 µg L-1 and 0.9 µg L-1 for Br- and BrO3-, respectively, with a repeatability lower than 10% for both bromine species. The non-instrumental method was validated against two certified reference materials, namely BCR-611 and BCR-612 (low and high level Br- in  groundwater), and successfully applied to the analysis of environmental water samples with recoveries in the range 93–106%.
PB Sensors and Actuators B Chemical
SN 09254005
YR 2022
FD 2022-05
LK http://hdl.handle.net/11093/3021
UL http://hdl.handle.net/11093/3021
LA eng
NO Sensors and Actuators B Chemical, 358, 131499 (2022)
NO Financiado para publicación en acceso aberto: Universidade de  Vigo/CISUG
NO Agencia Estatal de Investigación | Ref. RTI2018-093697-B-I00
DS Investigo
RD 25-sep-2023