title: Detection of heavy metals in water using dye nano-complexants and a polymeric film.
abstract: An optical analytical method, based on complexation reactions of organic azo-dyes with heavy metals, is proposed. It is based on a specially designed polymeric film that when submerged in water contaminated with heavy metals it changes its color. The azo-dyes are injected into the tested water, resulting in formation of nano-particles of insoluble complexes. The polymeric film embeds and dissolves these nano-particles and thus allows for spectral and/or visual analysis. This film consists of a PVC polymeric skeleton and an organic solvent, bis(2-ethylhexyl)phthalate, which possesses high affinity to the heavy metal nano-complexes. The method was exemplified for Cd, Ni and Co ions. The method is sensitive in the sub-ppm range. The mechanism and kinetics of the film coloration were reported.
authors.affiliation: Schulich Faculty of Chemistry, The Grand Water Research Institute and The Center for Security Science and Technology, Technion - Israel Institute of Technology, Haifa 32000, Israel.
authors.forename: Hodayah Abuhatzira
authors.initials: HA
authors.lastname: Hadar
authors.forename: Valery
authors.initials: V
authors.lastname: Bulatov
authors.forename: Bella
authors.initials: B
authors.lastname: Dolgin
authors.forename: Israel
authors.initials: I
authors.lastname: Schechter
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D002104:Cadmium / Q000737:chemistry; D002138:Calibration; D003035:Cobalt / Q000737:chemistry; D004396:Coloring Agents / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007477:Ions; D007700:Kinetics; D057230:Limit of Detection; D019216:Metals, Heavy / Q000032:analysis* / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry; D009532:Nickel / Q000737:chemistry; D055095:Optics and Photonics; D010316:Particle Size; D011108:Polymers / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D007477:Ions; D019216:Metals, Heavy; D011108:Polymers; D012997:Solvents; D014874:Water Pollutants, Chemical; D002104:Cadmium; D014867:Water; D003035:Cobalt; D009532:Nickel
keywords: Analysis; Complexation; Heavy metals; Polymeric film; Strip test