Development and characterization of a new nickel(II) ion selective optode based on 2-amino-1-cyclopentene-dithiocarboxylic acid

A highly sensitive and selective optical membrane sensor was prepared for the determination of ultra trace amount of Ni2+ ions. The plasticized PVC membrane incorporating dibuthylphthalate and 2-amino-1-cyclopentene-dithiocarboxylic acid (ACDA) as a chromoionophore works on the basis of a cation-exchange mechanism and shows a significant absorbance signal change on exposure to acidic solution containing nickel(II) ion. The sensor displays a calibration response for Ni2+ ion over a wide concentration range of 3.1 × 10−8–8.0 × 10−3 M, and a response time of 3 min. In addition to high stability, reproducibility and relatively long working lifetime, the sensor possesses good selectivity for nickel(II) ion over several common diverse ions. The sensor was successfully applied to determine the traces of Ni2+ ion in some water samples.

Development and characterization of a highly sensitive and selective optical membrane sensor, based on 2-amino-1-cyclopentene-dithiocarboxylic acid, for the determination of trace amounts of nickel(II) ions in aqueous solutions.Figure optionsDownload as PowerPoint slideHighlights
► Measurement of nickel, as a toxic element, in environmental and food samples is an urgent need.
► This optical sensor is a highly sensitive and selective device to determine ultra-trace amount of Ni2+ ion.
► The advantages of the optode are wide dynamic range, low detection limit and good reversibility.
► The sensor successfully determines the Ni(II) concentration in water sources and aqueous samples.