Combination of two liquid microextraction methods for extraction and determination of copper in water samples by using flame atomic absorption spectroscopy

Subject Areas :

MARYAM  RAZIEE ¹ (Assistant Prof. of Analytical Chemistry, Faculty of Chemistry, North Tehran Branch, Islamic Azad University, Tehran, Iran.)

Received: 2023-02-13 Accepted : 2023-02-28 Published : 2023-11-22

Keywords: Water samples, Preconcentration, microextraction, Flame atomic absorption spectroscopy, Copper determination,

Abstract :

In this research, the method of emulsion micro-extraction with the help of ultrasonic waves based on the freezing of floating organic drop along with flame atomic absorption device was used to extract, pre-concentrate and measure copper in different water samples. The copper cation forms a complex with the ligand under suitable conditions and is transferred from the aqueous phase to the organic phase of the extractant which is injected into the aqueous solution with a microsyringe. With the help of ultrasonic waves, very fine droplets of extracting solvent are dispersed in the aqueous phase and a cloudy emulsion solution is formed. The use of centrifuge and ice bath in this method leads to the freezing of microdrops of organic solvent from the surface of the aqueous solution, which are collected and introduced to the atomic absorption device for measurement with ethanol as a carrier. Factors affecting copper complex formation and extraction were investigated and optimal conditions were reported. Analytical figures of merit were evaluated in the proposed method, and the results were acceptable and better than previous reports. The efficiency of the extraction method was successfully confirmed in different water samples.

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