Solid phase extraction using silica gel modified with murexide for preconcentration of uranium (VI) ions from water samples

Sadeghi, Susan; Sheikhzadeh, Elham

doi:10.1016/j.jhazmat.2008.07.053

Cited by 125 publications

(37 citation statements)

References 44 publications

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“…± SD (n = 3) U 2.68 ± 0.12 2.63± 0.15 Table 6 compare the proposed method with the other extraction methods for the determination of the target analyte in water samples. The quantitative results of the proposed method are better than of solid phase extraction [10,34] and DLLME [35]. The comparison of extraction time of the proposed method with cloud-point extraction [33] for the extraction of the target analyte indicates that this method has a short extraction time.…”

Section: Analysis Of Real Samplesmentioning

confidence: 88%

Preconcentration of uranium in water samples using dispersive liquid-liquid micro- extraction coupled with solid-phase extraction and determination with inductively coupled plasma-optical emission spectrometry

Rezaee¹,

Khalilian²

2015

Bull. Chem. Soc. Eth.

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ABSTRACT.A new liquid phase microextraction method based on the dispersion of an extraction solvent into aqueous phase coupled with solid-phase extraction was investigated for the extraction, preconcentration and determination of uranium in water samples. 1-(2-Pyridylazo)-2-naphthol reagent (PAN) at pH 6.0 was used as a chelating agent prior to extraction. After concentration and purification of the samples in SPE C18 sorbent, 1.5 mL elution sample containing 40.0 µL chlorobenzene was injected into the 5.0 mL pure water. After extraction and centrifuging, the sedimented phase was evaporated and the residue was dissolved in nitric acid (0.5 M) and was injected by injection valve into the ICP-OES. Some important extraction parameters, such as sample solution flow rate, sample pH, type and volume of extraction and disperser solvents as well as the salt addition were studied and optimized. Under the optimum conditions, the calibration graph was linear in the range of 0.5-500 µg L . The relative standard deviation (RSD) at 5.0 µg L -1 concentration level was 6.6%. Finally, the developed method was successfully applied to the extraction and determination of uranium in the well, river, mineral, waste and tap water samples and satisfactory results were obtained.

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Section: Analysis Of Real Samplesmentioning

confidence: 88%

Preconcentration of uranium in water samples using dispersive liquid-liquid micro- extraction coupled with solid-phase extraction and determination with inductively coupled plasma-optical emission spectrometry

Rezaee¹,

Khalilian²

2015

Bull. Chem. Soc. Eth.

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“…High concentrations of Tl (up to 490 ppm) in the PMD. Tl is not common but is commonly associated with Carlin-type gold deposits that have a close proximity to Eocene volcanic centers or plutons [92][93][94][95][96]. Thus, the Tl and Au detected in the PMD could support an intrusion.…”

Section: Mineral Paragenesis Pmdmentioning

confidence: 99%

“…A variety of other methods such as precipitation, solvent extraction, electrolysis and ion exchange have been employed to remove dissolved metals from aqueous samples. Most of these have disadvantages such as poor removal efficiency, high cost, and generation of secondary pollutants and ineffectiveness for low concentration removal [93]. We are testing contaminated water from wells on the Navajo Reservation and using these SPCs as a potential method of remediation through various bench scale studies.…”

Section: Selective Solid Phase Extraction Of U From Contaminated Watermentioning

confidence: 99%

Possible Involvement of Permian Phosphoria Formation Oil as a Source of REE and Other Metals Associated with Complex U-V Mineralization in the Northern Bighorn Basin?

Moore-Nall

Tsosie

2017

Minerals

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Abstract:The origin of V, U, REE and other metals in the Permian Phosphoria Formation have been speculated and studied by numerous scientists. The exceptionally high concentrations of metals have been interpreted to reflect fundamental transitions from anoxic to oxic marine conditions. Much of the oil in the Bighorn Basin, is sourced by the Phosphoria Formation. Two of the top 10 producing oil fields in Wyoming are located approximately 50 km west of two abandoned U-V mining districts in the northern portion of the basin. These fields produce from basin margin anticlinal structures from Mississippian age reservoir rock. Samples collected from abandoned U-V mines and prospects hosted in Mississippian aged paleokarst in Montana and Wyoming have hydrocarbon residue present and contain anomalous high concentrations of many metals that are found in similar concentrations in the Phosphoria Formation. As, Hg, Mo, Pb, Tl, U, V and Zn, often metals of environmental concern occur in high concentrations in Phosphoria Formation samples and had values ranging from 30-1295 ppm As, 0.179-12.8 ppm Hg, 2-791 ppm Mo, <2-146 ppm Pb, 10-490 ppm Tl, 907-86,800 ppm U, 1240-18,900 ppm V, and 7-2230 ppm Zn, in mineralized samples from this study. The REE plus Y composition of Madison Limestone-and limestone breccia hosted-bitumen reflect similar patterns to both mineralized samples from this study and to U.S. Geological Survey rock samples from studies of the Phosphoria Formation. Geochemical, mineralogical and field data were used to investigate past theories for mineralization of these deposits to determine if U present in home wells and Hg content of fish from rivers on the proximal Crow Indian Reservation may have been derived from these deposits or related to their mode of mineralization.

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“…The procedure for preparation of the new sorbent includes three steps as follows; in the first step, activation of 25.0 g of silica gel surface was accomplished by reflux in 6.0 mol/L hydrochloric acid for 24 h. Then the product was filtered and repeatedly washed with doubly distilled water and finally dried in an oven at 160°C for 8 h. In the second step, 20.0 g of the activated silica gel was suspended in 200 mL of dry toluene containing 22.5 mL of 3-aminopropyltrimethoxysilane (CPMS) as silylating reagent and refluxed for 12 h. At the end of this time, the modified silica gel (SiCPMS) was filtered off, washed with toluene, ethanol and diethyl ether, respectively, to remove possible trace amounts of the reagent and dried at 70°C for 6 h [45].…”

Section: Preparation Of the Modified Silica Gelmentioning

confidence: 99%

Solid phase extraction using silica gel modified with azo-dyes derivative for preconcentration and separation of Th(IV) ions from aqueous solutions

Kırkan

Ayçık

2015

J Radioanal Nucl Chem

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Azo-dyes derivative (HL) sorbent was synthesized according to the literature to be used in the adsorption and preconcentration of Th(IV) ions from aqueous solution and it was exposed to immobilization, and new solid support material was obtained. For this purpose, azo-dyes derivative (HL) was chemically bonded to silica gel surface immobilized 3-chloropropyl trimethoxysilane, then analyzed by FTIR, BET, SEM and elemental analysis. The influence of the solution pH, initial Th(IV) concentration, amount of sorbent, contact time, temperature and foreign ion effect was investigated. The maximum Th(IV) uptake capacity was found to be 24.85 ± 0.2 mg/g.

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Solid phase extraction using silica gel modified with murexide for preconcentration of uranium (VI) ions from water samples

Cited by 125 publications

References 44 publications

Preconcentration of uranium in water samples using dispersive liquid-liquid micro- extraction coupled with solid-phase extraction and determination with inductively coupled plasma-optical emission spectrometry

Preconcentration of uranium in water samples using dispersive liquid-liquid micro- extraction coupled with solid-phase extraction and determination with inductively coupled plasma-optical emission spectrometry

Possible Involvement of Permian Phosphoria Formation Oil as a Source of REE and Other Metals Associated with Complex U-V Mineralization in the Northern Bighorn Basin?

Solid phase extraction using silica gel modified with azo-dyes derivative for preconcentration and separation of Th(IV) ions from aqueous solutions

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