Ali MOGHIMI - Department of Chemistry, Varamin Campus Islamic Azad University, Varamin, Iran
Mohsen SHABANI - Department of Chemistry, Varamin Campus Islamic Azad University, Varamin, Iran
Fatemeh Amouzadeh Khalili - Department of Chemistry, East Tehran(Ghiamdasht) Campus Islamic Azad University, Tehran, Iran

A new, simple and versatile cloud-point extraction (CPE) methodology has been developed for Type equation here.the separation and preconcentration of Zinc. The metals in the initial aqueous solution were complexed with N-(2-ethylhexyl)-pyridine-2- carboxamide (NEHP) and Triton X-114 was added as surfactant. Dilution of the surfactant-rich phase with acidified methanol was performed after phase separation, and the Zinc contents were measured by flame atomic absorption spectrometry. The variables affecting the cloud-point extraction were optimized using a Box–Behnken design. Under the optimum experimental conditions, enrichment factors of 29 and 25 were achieved for Zinc. The accuracy of the method was evaluated and confirmed by analysis of the ICPAES. The limits of detection expressed to solid sample analysis were 0.1 5g g61 (Zn). The precision for 10 replicate measurements of 75 5gL61 Zn was 1.2. The method has been successfully applied to the analysis of water samples.

Zinc; Cloud-point extraction; water samples