Au nano colloid as colorimetric sensor for heavy metal ions detection.

This research aims to prepare a nanocolloidal solution of gold by chemical reduction method by tri sodium citrate (TSC) as a reduction agent and using gold chloride as a source of gold ions in aqueous solution at low temperatures (room temperature) and applying the solution as a colorimetric sensor to detect some heavy metal ions. The prepared solution was diagnosed by Transmission electron microscope as well as the XRay Diffraction. The results showed that the shape of the prepared particles is spherical with diameters close to 10 nanometers and with good scattering. The ions of zinc, lead, iron, and copper elements were detected. The nanomaterial gave a very fast color response after adding ions to the solution. And through the results obtained, it is expected that this prepared material can be used in environmental applications. [ABSTRACT FROM AUTHOR]