A new approach is presented in this paper by using dispersed TiO2 nanoparticles (TiO2
a combined cloud point and solid phase extraction for the efficient preconcentration and determination
of Zn2þ in various samples. In this method Zn2þ ions are adsorbed on TiO2
surfactant rich phase. Subsequently the Zn2þ ions are desorbed from TiO2
via forming a color complex which could be detected colorimetrically. The influence of chemical
variables such as pH of the sample solution, electrolyte, amount of TiO2
eluent on the extraction system was studied. The calibration graph was linear in the range of 0.5
90.0 mg L1 of Zn2þ (r1⁄40.9996). An enrichment factor of 80 was achieved and the limit of detection for
Zn2þ was 0.33 mg L1
10 mg L1 and 60 mg L1 of Zn2þ was 1.8% and 1.5% respectively. The proposed method was successfully
applied to the quantitative determination of Zn2þ in tap water, powder milk and Zinc sulfate tablet with
satisfactory results.
. The relative standard deviation (RSD) for eight replicate measurements of