Solid phase extraction of uranium from phosphoric acid: kinetic and thermodynamic study

2017 ◽  
Vol 105 (10) ◽  
Author(s):  
Ahmed Fawzy Abdel-Magied
Keyword(s):  
Phosphoric Acid ◽  
Solid Phase Extraction ◽  
Solid Phase ◽  
Mixing Time ◽  
Phosphoric Acid Solution ◽  
Phase Extraction ◽  
Mixture Ratio ◽  
Kinetic And Thermodynamic Study ◽  
Phosphoric Acid Concentration ◽  
Mcm 41

AbstractThere is a high interest to develop suitable solid phase extractants for uranium separation from aqueous solutions in order to reduce cost and enhance the efficiency. This paper describes solid phase extraction of uranium(VI) from aqueous phosphoric acid solution using MCM-41 based D2HEPA-TOPO organophosphorous extractants. The mixture of D2HEPA (di-2-ethyl-hexylphosphoric acid) and TOPO (tri-n-octylphosphine oxide) was impregnated into the pores of MCM-41 and the synthesized sorbent was fully characterized. The influences of different factors such as synergistic mixture ratio, phosphoric acid concentration, mixing time and temperature were investigated. The results showed that 90% of uranium(VI) extraction can be achieved within 5 min, using D2HEPA-TOPO@MCM-41 (mass ratio 2:1 w/w) from 1 M phosphoric acid containing 64 ppm of uranium at room temperature. High adsorption capacity of uranium(VI) have been achieved at the mentioned conditions. The rate constant for the chemical adsorption of uranium(VI) was 0.988 g mg

scholarly journals A rapid MCM-41 dispersive micro-solid phase extraction coupled with LC/MS/MS for quantification of ketoconazole and voriconazole in biological fluids

2016 ◽  
Vol 31 (2) ◽  
pp. e3803 ◽  
Author(s):  
Noorfatimah Yahaya ◽  
Mohd Marsin Sanagi ◽  
Noorizan Abd Aziz ◽  
Wan Aini Wan Ibrahim ◽  
Hadi Nur ◽  
...  
Keyword(s):  
Solid Phase Extraction ◽  
Solid Phase ◽  
Biological Fluids ◽  
Phase Extraction ◽  
Mcm 41

scholarly journals Magnetic Solid Phase Extraction using Magnetic Mesoporous Silica for Preconcentration of Organophosphorus Pesticides

2019 ◽  
Vol 8 (4) ◽  
pp. 6847-6852
Keyword(s):  
Mesoporous Silica ◽  
Solid Phase Extraction ◽  
Water Samples ◽  
High Performance ◽  
Solid Phase ◽  
Organophosphorus Pesticides ◽  
Magnetic Solid Phase Extraction ◽  
Phase Extraction ◽  
Magnetic Solid ◽  
Mcm 41

The present study describes the synthesis, characterization and application of two mesoporous silica material based coated magnetic nanoparticles namely Fe3O4 -SBA-15 and Fe3O4 -MCM-41 for the simultaneous preconcentration of three selected organophosphorus pesticides (OPPs) namely chlorpyrifos, diazinon and parathion methyl from water samples. The resultant sorbent material was physicochemically and morphologically characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and N2 adsorption analysis. OPPs pesticides extraction efficiency of two sorbents were evaluated through magnetic solid phase extraction (MSPE) using high performance liquid chromatography with ultraviolet detector (HPLC/UV). The main parameters affecting the sorbent efficiency namely extraction time and desorption solvent were optimized. Comparatively, Fe3O4 -SBA-15 achieved excellent percent recovery (97.5%) compared to the Fe3O4 -MCM-41 (87.1%) under optimum condition respectively. The result appealed that the Fe3O4 -SBA-15 composite was efficient sorbent with good capability for the preconcentration of selected OPPs from water samples.AThe present study describes the synthesis, characterization and application of two mesoporous silica material based coated magnetic nanoparticles namely Fe3O4 -SBA-15 and Fe3O4 -MCM-41 for the simultaneous preconcentration of three selected organophosphorus pesticides (OPPs) namely chlorpyrifos, diazinon and parathion methyl from water samples. The resultant sorbent material was physicochemically and morphologically characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and N2 adsorption analysis. OPPs pesticides extraction efficiency of two sorbents were evaluated through magnetic solid phase extraction (MSPE) using high performance liquid chromatography with ultraviolet detector (HPLC/UV). The main parameters affecting the sorbent efficiency namely extraction time and desorption solvent were optimized. Comparatively, Fe3O4 -SBA-15 achieved excellent percent recovery (97.5%) compared to the Fe3O4 -MCM-41 (87.1%) under optimum condition respectively. The result appealed that the Fe3O4 -SBA-15 composite was efficient sorbent with good capability for the preconcentration of selected OPPs from water samples.

Determination of Menbutone Residues in Edible Swine Tissues Based on Solid-Phase Extraction and RP-HPLC

2020 ◽  
Vol 16 (2) ◽  
pp. 159-167
Author(s):  
Liya Zhou ◽  
Ping Zhang ◽  
Jiangbo Liu ◽  
Xiaobo Wu ◽  
Lei Luo ◽  
...  
Keyword(s):  
Solid Phase Extraction ◽  
Solid Phase ◽  
Phosphoric Acid Solution ◽  
Phase Extraction ◽  
Application Study ◽  
Column Temperature ◽  
Rp Hplc ◽  
Liver And Kidney ◽  
Fat Liver

Background: Menbutone is widely used as a veterinary choleretic drug in many countries. There was no publicly available analysis method for the determination of menbutone residues in swine tissues. It is necessary to establish a method to control the maximum residue limit and ensure food safety of the public. Objective: The aim of this study is to establish an analytical method for the simultaneous determination of menbutone in muscle, fat, liver and kidney tissues from swine. Methods: MBT residue was extracted by acetonitrile from the tissues then purified by using a C18 solid phase extraction (SPE) cartridge and an alkaline alumina (ALA) SPE cartridge. MBT was detected by RP-HPLC and separation was achieved on a Shim-pack VP-ODS C18 HPLC column using phosphoric acid solution (0.5%, v/v) and acetonitrile (45/55, v/v) at a flow rate of 1.0 mL/min. The effluent was monitored at 235 nm, and the column temperature was set to 30°C. Results: MBT eluted at 6.3 min and no interfering peak nearby was observed. This linearity within the concentration range of 0.02 (LOQ) and 12 µg/mL (r2>0.9999, n=6). The accuracy ranged from 74.07 to 110.83% of the actual values. Intra and inter-day precision were within 15.11%. In the application study, MBT was detectable in continuously dosing MBT 10 µg/g/day to healthy swine for 7 days. Conclusion: The proposed method has specificity, accuracy, and sensitivity, with an excellent linear relationship that successfully applied to swine tissues.

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