A Simple inexpensive detection method of Nickel in Water using Optical Sensor

A thio carboxylic acid derivative: 2-aminocyclopent-1-ene-1-carbodithioic acid (ligand) was synthesized and characterized. It was used as a colorimetric chemo sensor (chads) for Ni. The absorption maximum of ligand and Ni shows a shift from 390 nm to 420 nm in absence of buffer solutions. The change in color is very easily observed by the naked eye, while other metal cations, such as Fe, Co, Hg, Zn, Cd, Cu, Fe, Ag, Pb, alkali metal and alkaline earth metal cations do not induce such a change with these chads. The response time upon exposure to Ni is instantaneous. The significant problem of nickel poisoning requires new methods of detection that are sensitive and selective. Here we report a simple system that takes advantage of the unique optical properties generated by ACDA-