Trace Determination of Hg & Pb Ions Using Sensitive Optical Chemosensor Based on Poly (Acrylamide-Co-Methylenbisacrylamide)

A new optical sensor which utilizes TiO2/poly (acrylamide-co-methylenbisacrylamide) nanocomposites as an effective sorbents has been developed for determination and measurement of Hg(II) and Pb(II) trace levels in environmental samples. The method is based on high affinity for heavy metal ions due to the presence of several extractive sites on polymer shells on the nanoparticles due to sharing an electron pair of N and Ogroups of polymer chains with heavy metal ions. At first, the preconcentration of toxic metal ions in the polymeric shell was performed. Then, dithizone (DZ) as a choromophore probe utilized for detection ofHg(II) & Pb(II) (with ultra traces concentration) with naked-eye. The color of interacted sorbent with Hg(II) and Pb(II) shifts from white to violet and red, respectively. Synthesized nanochemosensor displays high detection ability in a wide range of Hg(II) & Pb(II) concentrations lower than 2 ppb and 10 ppb, respectively.

کلیدواژه ها:

Optical sensor ، Colorimetric sensor ، Heavy metals ، Toxic metals ، Dithizone