scholarly journals Determination of fluorine in herbs and water samples by molecular absorption spectrometry after preconcentration on nano-TiO2 using ultrasound-assisted dispersive micro solid phase extraction

2017 ◽  
Vol 409 (27) ◽  
pp. 6439-6449 ◽  
Author(s):  
Magdalena Krawczyk-Coda ◽  
Ewa Stanisz
Keyword(s):  
Solid Phase Extraction ◽  
Water Samples ◽  
Solid Phase ◽  
Absorption Spectrometry ◽  
Phase Extraction ◽  
Molecular Absorption ◽  
Nano Tio2 ◽  
Molecular Absorption Spectrometry ◽  
Ultrasound Assisted

scholarly journals Zinc based metal–organic framework for nickel adsorption in water and wastewater samples by ultrasound assisted-dispersive-micro solid phase extraction coupled to electrothermal atomic absorption spectrometry

2020 ◽  
Vol 3 (04) ◽  
pp. 5-16
Author(s):  
Negar Motakef kazemi
Keyword(s):  
Solid Phase Extraction ◽  
Water Samples ◽  
Solid Phase ◽  
Metal Organic Framework ◽  
Electrothermal Atomic Absorption Spectrometry ◽  
Absorption Spectrometry ◽  
Phase Extraction ◽  
Nickel Ions ◽  
Metal Organic ◽  
Ultrasound Assisted

In this research, Zn2(BDC)2(DABCO) metal–organic framework (MOF) as a solid phase was used for separation and preconcentration toxic nickel ions (Ni) from water samples by ultrasound assisted-dispersive-micro solid phase extraction coupled to electrothermal atomic absorption spectrometry (USA-D-μ-SPE/ET-AAS). The MOF nanostructure was characterized by field emission-scanning electron microscope (FE-SEM) and transmission electron microscopey (TEM) for presentation of morphology and size of MOF synthesis. By procedure, 25 mg of Zn2(BDC)2(DABCO) as MOF adsorbent was added to 25 mL of water samples and then, Ni ions chemically adsorbed based on dative bonding of nitrogen in DABCO (1,4-diazabicyclo [2.2. 2]octane); N2(C2H4)3) at pH=8. The adsorbent was separated from liquid phase by syringe cellulose acetate filters (SCAF, 0.2 μm) and Ni ions back extracted from MOF adsorbent before determined by ET-AAS.  The maximum recovery of MOF for nickel ions as a physically and chemically adsorption was obtained 34.6% and 98.8% at pH=3 and 8, respectively.

Application of dendrimer modified halloysite nanotubes as a new sorbent for ultrasound-assisted dispersive micro-solid phase extraction and sequential determination of cadmium and lead in water samples

2016 ◽  
Vol 31 (7) ◽  
pp. 1505-1514 ◽  
Author(s):  
Magdalena Krawczyk ◽  
Somaye Akbari ◽  
Magdalena Jeszka-Skowron ◽  
Elmira Pajootan ◽  
Farnaz Shahamati Fard
Keyword(s):  
Solid Phase Extraction ◽  
Water Samples ◽  
Solid Phase ◽  
Halloysite Nanotubes ◽  
Phase Extraction ◽  
Sequential Determination ◽  
Preconcentration Procedure ◽  
Ultrasound Assisted ◽  
Cadmium And Lead

A preconcentration procedure for cadmium and lead using dendrimer modified HNTs was developed prior to its sequential determination by HR-CS GFAAS.

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