scholarly journals Solid-Phase Extraction of Trace Amounts of Uranium(VI) in Environmental Water Samples Using an Extractant-Impregnated Resin Followed by Detection with UV-Vis Spectrophotometry

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Ahmad Hosseini-Bandegharaei ◽  
Masoud Sarwghadi ◽  
Aliasghar Heydarbeigi ◽  
Seyyed Hossein Hosseini ◽  
Mehdi Nedaie
Keyword(s):  
Water Samples ◽  
Solid Phase ◽  
Environmental Water ◽  
Extraction Methods ◽  
Sample Volume ◽  
Environmental Water Samples ◽  
Adsorption Model ◽  
Separation And Preconcentration ◽  
Impregnated Resin ◽  
Maximum Sorption

A stable extractant-impregnated resin (EIR) containing Chrome Azurol B was prepared using Amberlite XAD-2010 as a porous polymeric support. The new EIR was employed for trace separation and preconcentration of U(VI) ion followed by spectrophotometric determination with the arsenazo III procedure. CAB/XAD-2010 exhibited excellent selectivity for U(VI) ion over coexisting ions. Experimental parameters including pH, contact time, shaking speed, and ionic strength were investigated by batch extraction methods. Maximum sorption of U(VI) ions occurred at pH 4.3–6.9. The capacity of EIR was found to be 0.632 mmol·g−1. Equilibrium was reached in 25 min and the loading half-time,t1/2, was less than 6 min. The equilibrium adsorption isotherm of U(VI) was fitted with the Langmuir adsorption model. In addition, a column packed with CAB/XAD-2010 was used for column-mode separation and preconcentration of U(VI) ion. For the optimization of the dynamic procedure, effects of sample volume, sample and eluent flow rate, eluent concentration, and its volume were investigated. The preconcentration factors for U(VI) were found out to be 160. But, for convenience, a preconcentration factor of 150 was utilized for the column-mode preconcentration. The dynamic procedure gave a detection limit of5.0×10-10 mol·L−1(0.12 μg·L−1) for U(VI) ion. The proposed dynamic method showed good performance in analyzing environmental water samples.

scholarly journals Using nanometer TiO2 modified with cetyl trimethyl ammonium bromide for separation and preconcentration of Parathion in water sample

2016 ◽  
Vol 17 (2) ◽  
pp. 362-371
Author(s):  
Haghighe Fathi ◽  
Robab Soltani-Jigheh ◽  
Saeed Hemmati
Keyword(s):  
Water Samples ◽  
Cetyl Trimethyl Ammonium Bromide ◽  
Solid Phase ◽  
Environmental Water ◽  
Sample Volume ◽  
Ammonium Bromide ◽  
Base Line ◽  
Relative Standard ◽  
Separation And Preconcentration ◽  
Cetyl Trimethyl Ammonium

In this work, nanometer TiO2 modified by cetyl trimethyl ammonium bromide (CTAB) was used as adsorbent for solid-phase extraction (SPE) of Parathion in environmental water samples. Adsorbed Parathion was then desorbed with different eluents and determined by gas chromatography (GC)/flame ionization detection. Greater selectivity, resolution, and sensitivity have been seen by GC compared with other methods. Parameters that might influence the extraction efficiency, such as the eluent type and its volume, adsorbent amount, sample volume, sample pH and sample flow rate, were optimized. Under the optimized extraction conditions with toluene as the eluent, the experimental results showed the excellent linearity of Parathion (R2 > 0.99) over the range of 0.01–0.8 μg/mL, and the relative standard deviation was 6.3% (n = 5). The detection limit of the proposed method could reach 0.024 ng/mL based on the ratio of chromatographic signal to base line noise (S/N = 3). Recovery of 93% was achieved with spiked water samples. The method was successfully applied to the analysis of surface water samples.

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