Cloud Point Extraction and Preconcentration for the Determination of Cu and Ni in Natural Water by Flame Atomic Absorption Spectrometry

Authors: Shemirani, Farzaneh¹; Jamali, Mohammad¹; Kozani, Reyhaneh¹; Salavati‐Niasari, Masood²

Source: Separation Science and Technology, Volume 41, Number 13, 2006 , pp. 3065-3077(13)

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Abstract:

In this work, a new cloud point extraction (CPE) method was developed for the separation and preconcentration of copper and nickel. The analyte was complexed with 3‐[(8‐{[(E)‐2‐hydroxyimino‐1‐methylpropylidene] amino}‐1‐naphthyl) imino]‐2‐butanone oxime (H 2 mdo) in the initial aqueous solution and octylphenoxy polyethoxy ethanol (Triton X‐114) was added as a surfactant. After phase separation, based on the cloud point in the mixture, and dilution of the surfactant‐rich phase with methanol containing 0.1 mol l −1 HNO 3 , the enriched analytes were determined by flame atomic absorption spectrometry. After optimization of the complexation and extraction conditions (i.e. pH=8.5, H 2 mdo=3×10 −4 mol l −1 , Triton X‐114=0.1% (w/v)) the enhancement factors of 65 and 59 and detection limits of 0.14 and 0.2 ng ml −1 were obtained for copper and nickel respectively. The proposed method was applied to the determination of copper and nickel in several natural water samples with satisfactory results.

Keywords: Cloud point extraction; separation; copper; nickel; preconcentration

Document Type: Research article

DOI: http://dx.doi.org/10.1080/01496390600785970

Affiliations: 1: School of Chemistry, College of Science, University of Tehran, Tehran, Iran 2: Department of Chemistry, Faculty of Science, University of Kashan, Kashan, Iran

Publication date: 2006-01-01