Ion pair-based dispersive liquid–liquid microextraction combined with UV-Vis spectrophotometry as a circuitous assay for nitrite

2015 ◽  
Vol 7 (20) ◽  
pp. 8655-8662 ◽  
Author(s):  
Parisa Poormoghadam ◽  
Arash Larki ◽  
Saadat Rastegarzadeh
Keyword(s):  
Ion Pair ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

This paper proposes a fast and reliable dispersive liquid–liquid microextraction (DLLME) method for the determination of trace levels of nitrite by UV-Vis spectrophotometry.

Ultrasound-Assisted Ion-Pair Dispersive Liquid–Liquid Microextraction of Trace Amounts of Lead in Water Samples Prior to Graphite Furnace Atomic Absorption Spectrometry Determination

2013 ◽  
Vol 96 (1) ◽  
pp. 161-165 ◽  
Author(s):  
Daryoush Afzali ◽  
Ali Reza Mohadesi ◽  
Masoumeh Falahnejad ◽  
Behnoosh Bahadori
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Water Samples ◽  
Graphite Furnace ◽  
Absorption Spectrometry ◽  
Ion Pair ◽  
Graphite Furnace Atomic Absorption ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

Abstract A new ion-pair dispersive liquid–liquid microextraction method is described for separation and preconcentration of trace amounts of lead in different water samples. Graphite furnace atomic absorption spectrometry was used for determination of lead. The ion association complex between lead and iodide ions that forms is PbI4–2-tetradecyldimethylbenzylammonium, which is extracted into fine droplets of chlorobenzene. In order to reach the optimized experimental conditions, the influence of different parameters, such as concentration of KI, nature and volume of extraction solvents, pH effect, extraction time, and the period and speed of sonication and centrifugation, were optimized. The LOD was 0.08 ng/mL and the linear dynamic range was 0.20–8.0 ng/mL in initial solution with a correlation coefficient of 0.9985. Under the optimum conditions, the enrichment factor was 555.5. The proposed method was successfully applied for separation and determination of lead in sea, rain, river, and drinking water samples.

Efficient and selective extraction and determination of ultra trace amounts of Hg2+ using solid phase extraction combined with ion pair based surfactant-assisted dispersive liquid–liquid microextraction

RSC Advances ◽  
2015 ◽  
Vol 5 (122) ◽  
pp. 100511-100521 ◽  
Author(s):  
Marzieh Sadeghi ◽  
Ziba Nematifar ◽  
Mohsen Irandoust ◽  
Nazir Fattahi ◽  
Parya Hamzei ◽  
...  
Keyword(s):  
Solid Phase Extraction ◽  
Solid Phase ◽  
Selective Extraction ◽  
Ion Pair ◽  
Phase Extraction ◽  
Ultra Trace ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction ◽  
Surfactant Assisted

Solid phase extraction coupled with ion pair based surfactant-assisted dispersive liquid–liquid microextraction based on the solidification of the floating organic drop method was applied for determination of Hg2+ in different samples.

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