Convenient colorimetric approach to quantify CuO NPs in water using only a smartphone and cellulose paper with an immobilised chemosensor.

ABSTRACT: 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 λ_ex = 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 thro

SUBMITTER: Sanmartin-Matalobos J 

PROVIDER: S-EPMC12356722 | biostudies-literature | 2025 Aug

REPOSITORIES: biostudies-literature