RT Journal Article
T1 Convenient colorimetric approach to quantify CuO NPs in water using only a smartphone and cellulose paper with an immobilised chemosensor
A1 Sanmartín Matalobos, Jesús
A1 Bermejo Barrera, Pilar
A1 García Deibe, Ana María
A1 Fondo Busto, María Matilde
A1 Alves Iglesias, Yeneva
K1 CuO NPs
K1 Chemosensor
K1 Fluorescence
K1 Diffuse reflectance
K1 Smartphone assisted detection
AB A novel approach is reported to quantify CuO NPs in aqueous samples by using digital image colorimetry (DIC), which is a rapid, low-cost, and facile method. We have used a colour recogniser application on a smartphone to register the gradual colour changes experimented, under λex = 365 nm radiation, by a dansyl-based chemosensor immobilised on cellulose paper, after interacting with aqueous dispersions of CuO NPs with concentrations between 5 and 100 µg L−1. The low limits of detection (LOD) and quantification (LOQ) (10.5 and 34.9 µg L−1, respectively) show a relevant sensitivity for this simple method, which also displays a good precision and accuracy (analytical recovery, 99 ± 1%). A comparison of the results similarly obtained for the modified paper through diffuse reflectance (DR) revealed worse detection parameters (LOD = 100.0 µg L−1 and LOQ = 333.4 µg L−1). In addition, fluorescence spectroscopy (λem = 520 nm) demonstrated the ability of the free chemosensor (1.26 µg L−1 in 20:80 (v/v) water–ethanol solutions) for the quantification of CuO NPs (LOD = 30 µg L−1 and LOQ = 101 µg L−1), without improvement of the results obtained with DIC on the modified papers. The dissolved free chemosensor demonstrated selectivity towards CuO NPs in the presence both of metal ions common in aqueous samples as K+, Na+, Ca2+, Mg2+, Fe3+, or Al3+ and of other usual nanomaterials as those of Cu, CdSe, TiO2, and ZnO NPs
PB Springer
YR 2025
FD 2025
LK https://hdl.handle.net/10347/43072
UL https://hdl.handle.net/10347/43072
LA eng
NO Sanmartín-Matalobos, J., Bermejo-Barrera, P., García-Deibe, A.M. et al. Convenient colorimetric approach to quantify CuO NPs in water using only a smartphone and cellulose paper with an immobilised chemosensor. Microchim Acta 192, 594 (2025). https://doi.org/10.1007/s00604-025-07439-9
NO Open Access funding provided thanks to the CRUE-CSIC agreement with Springer Nature. We would like to thank the “Ministerio de Ciencia, Innovación y Universidades” of Spain (FOODNANORISK, PID2021-125276NB-I00), “Xunta de Galicia” (Grupo de Referencia Competitiva, ED431C 2022/029), and “Area de Infraestructuras de Investigación da USC” for the financial support provided for this work
DS Minerva
RD 24 abr 2026