Open AccessFast Optical Sensing of Metals: A Case Study of Cu2+ Assessment in Soils
Author(s) -
Larisa Lvova,
Elisa Acciari,
Federica Mandoj,
Giuseppe Pomarico,
Roberto Paolesse
Publication year - 2020
Publication title -
ecs journal of solid state science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.488
H-Index - 51
eISSN - 2162-8777
pISSN - 2162-8769
DOI - 10.1149/2162-8777/aba0d1
Subject(s) - optode , ionophore , ligand (biochemistry) , copper , porphyrin , aqueous solution , membrane , detection limit , crown ether , ion , analytical chemistry (journal) , materials science , nuclear chemistry , soil water , inorganic chemistry , chemistry , environmental chemistry , organic chemistry , chromatography , biochemistry , receptor , metallurgy , environmental science , soil science
In this paper we report an application of a novel porphyrin ligand, Zn(II)TPP-BPI-crown (ZnPC), functionalized with two dibenzo-crown-ether moieties as cation-sensitive ionophore. The test on the optical response of ZnPC ligand inside PVC-based polymeric membranes towards different cations (Na + , K + , Li + , Ca 2+ , Mg 2+ , Co 2+ , Cd 2+ , Pb 2+ , Zn 2+ , Cu 2+ and NH 4 + ) were performed. The influence of the lipophilic site functionalization on the ZnPC optode response was investigated. The visibly (naked eye) observed color change of sensing material from green to red demonstrated the suitability of the ZnPC-based optodes to perform fast monitoring of Cu(II) ions in the concentration range between 6.6 × 10 −7 and 2.4 × 10 −2 mol l −1 , with a low detection limit (estimated by s/n = 3 method) of 0.03 mg l −1 , which is lower than WHO guideline value of 2 mg l −1 for natural waters. The membranes with the best composition were deposited onto paper support and employed for the express analysis of copper(II) ion in aqueous soil extracts. The results obtained were in a good agreement with a standard ASS method, thus suggesting the utility of developed sensors for aims of express environmental monitoring.