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Design of a novel optical sensor for determination of trace amounts of copper by UV–visible spectrophotometry in real samples
Author(s) -
Pourbasheer Eslam,
Morsali Somayeh,
Azari Zhila,
Karimi Mohammad Ali,
Ganjali Mohammad Reza
Publication year - 2018
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.4110
Subject(s) - optode , chemistry , detection limit , selectivity , copper , spectrophotometry , thiourea , analytical chemistry (journal) , membrane , inorganic chemistry , metal ions in aqueous solution , linear range , buffer solution , ion , chromatography , organic chemistry , biochemistry , catalysis
A new optical chemical sensor is established for sensitive and selective spectrophotometric detection of copper based on the immobilization of 3‐(2‐methyl‐2,3‐dihydro‐1,3‐benzothiezol‐2‐yl)‐2 H ‐chromen‐2‐one on a triacetylcellulose membrane. Copper ions react with the immobilized ligand and cause an increase in the absorption of the membrane at 550 nm in universal buffer solution at pH = 6. The effects of pH, indicator concentration and reaction time on the immobilization of the ligand were studied. This optode exhibits a linear range of 7.0 × 10 −7 to 1 × 10 −4 mol l −1 of copper ion concentration with a limit of detection of 3.0 × 10 −7 mol l −1 . The response time of the newly designed optode is within 3 min. The effect of different possible interfering species was investigated and it was found that the sensor has very good selectivity. The proposed sensor benefits from advantages such as low cost, high stability, low detection limit, fast response time, reproducibility, relatively long lifetime, and good selectivity for Cu 2+ ion determination among a large number of alkali, alkaline earth, transition and heavy metal ions. The sensor can readily be regenerated with thiourea solution and its response is reversible and reproducible (relative standard deviation < 1.4%). The proposed optode was applied successfully for the determination of Cu(II) in various samples.