Preconcentration and determination of low amounts of cobalt in black tea, paprika and marjoram using dispersive liquid–liquid microextraction and flame atomic absorption spectrometry

2014 ◽  
Vol 12 (1) ◽  
pp. 51-56 ◽  
Author(s):  
S. Bahar ◽  
B. Babamiri
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Flame Atomic Absorption Spectrometry ◽  
Absorption Spectrometry ◽  
Black Tea ◽  
Flame Atomic Absorption ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

scholarly journals Preconcentration of Copper Using 1,5-Diphenyl Carbazide as the Complexing Agent via Dispersive Liquid-Liquid Microextraction and Determination by Flame Atomic Absorption Spectrometry

2013 ◽  
Vol 2013 ◽  
pp. 1-7
Author(s):  
Reyhaneh Rahnama ◽  
Elaheh Shafiei ◽  
Mohammad Reza Jamali
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Flame Atomic Absorption Spectrometry ◽  
Absorption Spectrometry ◽  
Complexing Agent ◽  
Diphenyl Carbazide ◽  
Flame Atomic Absorption ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

We report a simple and sensitive microextraction system for the preconcentration and determination of Cu (II) by flame atomic absorption spectrometry (FAAS). Dispersive liquid-liquid microextraction is a modified solvent extraction method and its acceptor-to-donor phase ratio is greatly reduced compared with other methods. In the proposed approach, 1,5-diphenyl carbazide (DPC) was used as a copper ion selective complexing agent. Several variables such as the extraction and dispersive solvent type and volume, pH of sample solution, DPC concentration, extraction time, and ionic strength were studied and optimized for a quantitative preconcentration and determination of copper (II) and at the optimized conditions: 60 μL, 0.5 mL, and 5 mL of extraction solvent (chloroform), disperser solvent (ethanol), and sample volume, respectively, a linear calibration graph was obtained over the concentration range of 10–200 μg L−1for Cu (II) withR2= 0.9966. The limit of detection (3Sb/m), and preconcentration factor are 2 μg L−1and 25, respectively. The relative standard deviation (n=10) at 100 μg L−1of Cu (II) is 2.5%. The applicability of the developed technique was evaluated by application to spiked environmental water samples.

A Simple and Rapid Dispersive Liquid–Liquid Microextraction Based on Solidification of Floating Organic Drop Method Combined with Flame Atomic Absorption Spectrometry for Preconcentration and Determination of Copper

2013 ◽  
Vol 96 (2) ◽  
pp. 441-446 ◽  
Author(s):  
Mohammad Mirzaei ◽  
Mansoureh Behzadi
Keyword(s):  
Complex Formation ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Flame Atomic Absorption Spectrometry ◽  
Absorption Spectrometry ◽  
Flame Atomic Absorption ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction ◽  
Determination Of Copper

Abstract A simple and rapid dispersive liquid–liquid microextraction based on solidification of floating organic drop method prior to flame atomic absorption spectrometry was developed for preconcentration and determination of copper. In this technique, simultaneous complex formation and extraction was performed with rapid injection of a mixture containing ethanol, 1-undecanol, and 1-(2-pyridylazo)-2-naphthol into a water sample spiked with Cu(II). After centrifugation, the test tube was cooled in an ice bath, and solidified extract transferred into a conical vial. Finally, it was dissolved into ethanol and copper concentration was determined. Some effective parameters of extraction and complex formation, such as extraction and disperser solvent type and volume, pH, concentration of the chelating agent, salt effect, and extraction time, were optimized. Under the optimum conditions, the calibration graph was linear in the range of 0.50 ng/mL to 0.30 μg/mL, with an LOD of 0.16 ng/mL. The RSD for 10 replicate measurements of 50.0 ng/mL of copper was ±1.4%. Two certified reference materials were analyzed, and the determined values were in good agreement with the certified values.

Sign in / Sign up

Export Citation Format

Share Document