Solid phase extraction of uranium (VI) from phosphoric acid medium using macroporous silica-based D2EHPA-TOPO impregnated polymeric adsorbent

2016 ◽  
Vol 164 ◽  
pp. 90-96 ◽  
Author(s):  
Afshin Khayambashi ◽  
Xiaolong Wang ◽  
Yuezhou Wei
Keyword(s):  
Phosphoric Acid ◽  
Solid Phase Extraction ◽  
Acid Medium ◽  
Solid Phase ◽  
Phase Extraction ◽  
Macroporous Silica ◽  
Polymeric Adsorbent

Solid phase extraction of zinc(II) using a PVC-based polymer inclusion membrane with di(2-ethylhexyl)phosphoric acid (D2EHPA) as the carrier

Talanta ◽  
2009 ◽  
Vol 78 (3) ◽  
pp. 795-799 ◽  
Author(s):  
Spas D. Kolev ◽  
Yoshinari Baba ◽  
Robert W. Cattrall ◽  
Tsutomu Tasaki ◽  
Natalie Pereira ◽  
...  
Keyword(s):  
Phosphoric Acid ◽  
Solid Phase Extraction ◽  
Solid Phase ◽  
Phase Extraction ◽  
Inclusion Membrane ◽  
Polymer Inclusion Membrane

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 An Efficient Solid-Phase Extraction-Based Liquid Chromatography Method to Simultaneously Determine Diastereomers α-Tocopherol, Other Tocols, and Retinol Isomers in Infant Formula

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Baifen Huang ◽  
Zengxuan Cai ◽  
Jingshun Zhang ◽  
Jiaojiao Xu
Keyword(s):  
Liquid Chromatography ◽  
Solid Phase Extraction ◽  
Infant Formula ◽  
Limit Of Detection ◽  
Solid Phase ◽  
Reversed Phase ◽  
Extraction Column ◽  
Phase Extraction ◽  
Chromatography Method ◽  
Macroporous Silica

The separation and simultaneous quantitation of diastereomers of DL-α-tocopherol, eight tocol forms, and retinols (trans and cis) have been conducted by reversed-phase liquid chromatography followed by solid-phase extraction. A chiral silica stationary phase modified with polysaccharide derivative on the monodisperse macroporous silica gel (Unichiral OD-5H column, 150 mm × 4.6 mm, 5 μm, NanoMicro Technology Co., Ltd.) was employed for eluting each target compound. Instead of conventional solvent extract, a green and eco-friendly solid-phase extraction column, packing with nonpolar polystyrene divinylbenzene, was optimized in terms of capacity and solvent used in steps. Validation of the method was examined and confirmed to be satisfactory, with excellent linearity regression (r > 0.9999), acceptable accuracy (74.66%∼112.92%), and precision (0.20%∼10.52%) results. Limit of detection ranged from 0.05 mg·kg−1 (retinols) to 0.4 mg·kg−1 (tocols). The method was checked by infant formula reference material SRM 1849a as well, which illustrated good agreement of mass fraction with certified value and enriched the important isomer data.

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