scholarly journals Evaluation of dispersive liquid-liquid microextraction for the determination of cobalt and cadmium by flame atomic absorption spectrometry: application in water and food samples

2014 ◽  
Vol 2 (1) ◽  
Author(s):  
C. Bosch Ojeda ◽  
F. Sánchez Rojas
Keyword(s):  
Chelating Agent ◽  
Absorption Spectrometry ◽  
Food Samples ◽  
Extraction Solvent ◽  
Flame Atomic Absorption ◽  
Separation And Preconcentration ◽  
Dispersive Liquid Liquid Microextraction ◽  
Optimized Conditions ◽  
Liquid Microextraction ◽  
Solvent Volume

AbstractDispersive liquid-liquid microextraction (DLLME) was applied to the separation and preconcentration of Cd(II) and Co(II) from water and food samples. The influence of the following analytical parameters on the quantitative recoveries of cadmium and cobalt were investigated: pH, extraction solvent volume, dispersing solvent volume and type, and concentration of chelating agent. Under the optimized conditions, the detection limits were 2 μg L

scholarly journals Cobalt separation from water and food samples based on penicillamine ionic liquid and dispersive liquid-liquid microextraction before determination by AT-FAAS

2021 ◽  
Vol 4 (03) ◽  
pp. 21-32
Author(s):  
Yaghoub Pourshojaei ◽  
Alireza Nasiri
Keyword(s):  
Ionic Liquid ◽  
Liquid Phase ◽  
Health Effect ◽  
Chelating Agent ◽  
Absorption Spectrometry ◽  
Food Samples ◽  
Cobalt Ions ◽  
Flame Atomic Absorption ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

The cobalt compounds have adverse health effect on human and caused damage to the DNA cells, neurological and endocrine systems. Therefore, the separation and determination of cobalt in water and food samples must be considered. In this research, the (2S)-2-amino-3-methyl-3-sulfanylbutanoic acid (penicillamine) as a chelating agent mixed with ionic liquid (OMIM PF6) /acetone and used for extraction of cobalt from 50 mL of water samples by ultra-assisted dispersive liquid-liquid microextraction (USA-DLLME) at pH=6. Based on procedure, the samples were shaked for 5 min (25oC) and after complexation of cobalt ions by thiol and amine group of penicillamine, the ionic liquid phase separated in the bottom of the conical tube by centrifuging for 3.0 min. The upper liquid phase was vacuumed by the auto-sampler and the Co2+ ions back extracted from the ionic liquid/ penicillamine in acidic pH. Finally, the cobalt concentration in remained solution was determined by atom trap flame atomic absorption spectrometry (AT-FAAS). The main parameters such as the sample volume, the penicillamine amount, the ionic liquid amount and the shaking time were optimized. The linear range, the detection limit (LOD) and enrichment factor were obtained 1.5-62 μg L-1, 0.38 μg L-1 and 98.5, respectively (r = 0.9995, RSD%=2.2).

Separation and Preconcentration of Trace Amounts of Rhodium Using a Dispersive Liquid–Liquid Microextraction Method and Its Determination by Flame Atomic Absorption Spectrometry

2014 ◽  
Vol 97 (3) ◽  
pp. 933-937 ◽  
Author(s):  
Fateme Mirrahimi ◽  
Mohammad Ali Taher
Keyword(s):  
Tap Water ◽  
Chelating Agent ◽  
Absorption Spectrometry ◽  
Flame Atomic Absorption ◽  
Separation And Preconcentration ◽  
Dispersive Liquid Liquid Microextraction ◽  
Ph Range ◽  
Extracting Solvent ◽  
Liquid Microextraction

Abstract A sensitive and selective method for the determination of low levels of rhodium (Rh) in environmental samples is needed. In the proposed method, an extracting solvent with a lower toxicity and density than the other solvents typically used in dispersive liquid–liquid microextraction was used to extract trace amounts of Rh from aqueous samples. Rh ions were complexed with 1-(2-pyridylazo)-2-naphthol in the pH range of 3.2–4.7 and extracted with dispersive liquid–liquid microextraction. The type and volume of the extracting solvent and dispersive solvent, centrifugation time, pH, amount of the chelating agent, and sample ionic strength were carefully studied. Under the optimal conditions, the LOD and RSD were 0.36 ng/mL (3Sb/m, n = 7) and ±2.0% (n = 7), respectively. The calibration curve was linear in the range of 4.0–800 ng/mL. The method was applied to the determination of Rh in well and tap water, and spiked recoveries were in the range of 96–103.7%.

Application of supramolecular solvent-based dispersive liquid–liquid microextraction for trace monitoring of lead in food samples

2016 ◽  
Vol 8 (27) ◽  
pp. 5533-5539 ◽  
Author(s):  
Ayoob Rastegar ◽  
Ahmad Alahabadi ◽  
Ali Esrafili ◽  
Zahra Rezai ◽  
Ahmad Hosseini-Bandegharaei ◽  
...  
Keyword(s):  
Flow Injection ◽  
Flame Atomic Absorption Spectrometry ◽  
Absorption Spectrometry ◽  
Treatment Method ◽  
Food Samples ◽  
Sample Treatment ◽  
Flame Atomic Absorption ◽  
Supramolecular Solvent ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

An efficient sample treatment method based on supramolecular solvent-based dispersive liquid–liquid microextraction was applied for trace monitoring of lead by flow injection flame atomic absorption spectrometry.

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