Emulsification based dispersive liquid microextraction prior to flame atomic absorption spectrometry for the sensitive determination of Cd(II) in water samples

2013 ◽  
Vol 180 (11-12) ◽  
pp. 973-979 ◽  
Author(s):  
Mehdi Rahimi-Nasrabadi ◽  
Mir Mahdi Zahedi ◽  
Seied Mahdi Pourmortazavi ◽  
Zakieh Nazari ◽  
Alireza Banan ◽  
...  
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Flame Atomic Absorption Spectrometry ◽  
Water Samples ◽  
Absorption Spectrometry ◽  
Flame Atomic Absorption ◽  
Sensitive Determination ◽  
Liquid Microextraction

Supramolecular-Based Ultrasonic-Assisted Dispersion Solidification Liquid–Liquid Microextraction of Copper and Cobalt Prior to Their Flame Atomic Absorption Spectrometry Determination

2017 ◽  
Vol 100 (6) ◽  
pp. 1861-1868 ◽  
Author(s):  
Ardeshir Shokrollahi ◽  
Foroogh Ebrahimi
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Flame Atomic Absorption Spectrometry ◽  
Water Samples ◽  
Absorption Spectrometry ◽  
Complexing Agent ◽  
Flame Atomic Absorption ◽  
Ultrasonic Assisted ◽  
Liquid Microextraction

Abstract In the present work, a simple, efficient, and environmentally friendly method was proposed for the simultaneous preconcentration and determination of minute quantities of copper and cobalt in water samples and serum by a supramolecular-based ultrasonic-assisted dispersion solidification liquid–liquid microextraction (DSLLME) procedure coupled with flame atomic absorption spectrometry. The procedure is based on the DSLLME of copper and cobalt with decanoic acid–tetrahydrofuran supramolecular solvent (SUPRAS) in the presence of sodium diethyldithiocarbamate, as the complexing agent. SUPRAS is a nanostructured liquid generated from amphiphiles through a sequential self-assembly process occurring on two scales, molecular and nano. Several variables that affect the extraction efficiency—including pH, concentration of complexing agent, volume of the extraction and dispersive solvents (volume of SUPRAS), sonication time, and ionic strength—were investigated and optimized. The method provided enrichment factors of 23.31 and 22.38 for copper and cobalt, respectively. The preconcentration factor for the two analytes was 20.00. Calibration plots were linear in the range of 5.00–700.00 ng/mL for copper and 5.00–500.00 ng/mL for cobalt, with correlations of determination of 0.9973 and 0.9981. The precision of the method were expressed as RSDs for six replicate measurements and LODs and found to be ±4.10 and ±2.30% for copper and 2.90 and 3.50 ng/mL for cobalt. The proposed method was successfully applied to the simultaneous determination of trace copper and cobalt in real water samples and serum with satisfactory results.

Ligandless dispersive liquid–liquid microextraction combined with syringe to syringe back extraction for the determination of lead in water samples by flame atomic absorption spectrometry

2017 ◽  
Vol 9 (32) ◽  
pp. 4673-4679 ◽  
Author(s):  
Li Yao ◽  
Wenzhi Xu ◽  
Chaowen Lin ◽  
Yongqun Zhu ◽  
Fuxiang Luo ◽  
...  
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Flame Atomic Absorption Spectrometry ◽  
Water Samples ◽  
Absorption Spectrometry ◽  
Back Extraction ◽  
Flame Atomic Absorption ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

Ligandless DLLME combined with syringe to syringe back extraction was applied for the preconcentration of Pb prior to analysis by FAAS.

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