Smartphone colorimetry for rapid environmental monitoring: Detecting Ni2+ using EDTA and mercapto succinic acid functionalized silver nanoparticles
Nubatonis Y.K. Roto R. Siswanta D. Keikimanova M. Hosseini-Bandegharaei A.
15 May 2025Elsevier B.V.
Journal of Molecular Liquids
2025#426
Keeping the importance of devising a simple, fast, low-cost, and precise method in view for the determination of the targeted analytes in an environmental sample, this work exploited synthesized silver nanoparticles (AgNPs) along with mercapto succinic acid (MSA) and ethylenediamine tetraacetate (EDTA) as probes for detecting Ni2+ ions. The effectiveness of these probes as Ni2+ sensors was validated using the digital image colorimetry (DIC) method. The prepared AgNPs had an average particle size of 14.68 nm and demonstrated good stability for up to 2 months. The addition of Ni2+ ions to colloidal AgNPs induced particle aggregation through metal–ligand coordination, which led to a color change in the solutions from yellow (λmax 402 nm) to blue (λmax 620 nm) and an increase in the Euclidean distance (Δd) value. Furthermore, the modified AgNPs were able to detect Ni2+ in the concentration range of 10–300 µM with a very low detection limit of 3.30 µM for the spectrophotometric method and 3.57 µM for the DIC method. The probe showed high selectivity for Ni2+ against eleven other potential interfering ions. The resulting sensor showed good performance in detecting Ni2+ ions in Code river and tap water with an accuracy of 97.43–106.85 %. Our findings provide a simple and rapid method for routine monitoring of the presence of heavy metals in environmental samples.
AgNPs , Digital image colorimetry , EDTA , Environmental monitoring , Mercapto succinic acid , Nickel
Text of the article Перейти на текст статьи
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Gadjah Mada University, Sekip Utara, Yogyakarta, 55281, Indonesia
Department of Physics, Taraz University named after M.Kh.Dulaty, Taraz, Kazakhstan
Department of Chemistry, Semnan University, Semnan, Iran
Centre of Research Impact and Outcome, Chitkara University, Punjab, Rajpura, 140417, India
University Centre for Research & Development, Chandigarh University, Punjab, Mohali, 140413, India
Department of Sustainable Engineering, Saveetha School of Engineering, SIMATS, Tamil Nadu, Chennai, 602105, India
Department of Chemistry
Department of Physics
Department of Chemistry
Centre of Research Impact and Outcome
University Centre for Research & Development
Department of Sustainable Engineering
10 лет помогаем публиковать статьи Международный издатель
Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026