Selective pre-concentration of selenite from aqueous samples using mercapto-silica

Date

2003-07-27

Author

Sahin, F
Volkan, Mürvet
Howard, AG
Ataman, Osman Yavuz

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

230
views

0
downloads

Silica gel modified with 3-mereaptopropyl-trimethoxysilane was used for the selective separation and pre-concentration of selenite (Se(IV)) from aqueous solutions containing Se(IV) and selenate (Se(VI)). Over a wide range of acidity, from 2 mol 1(-1) HCl to pH 9.00, Se(IV) was taken up by the mercaptopropyl-silica with nearly 100% efficiency; Se(VI) however was unretained. Se(IV) content was determined by hydride generation atomic absorption spectrometry (HGAAS), following batch release of the selenium from the pre-concentration medium by acidic periodate. The overall pre-concentration efficiency, including both take-up and elution, in the range of 89-106%. The method was applied to spiked seawater samples containing as low as 800 ng 1(-1) Se in selenite form. This solid-phase extraction system offers several major advantages over conventional solvent extraction procedures. It firstly exhibits high selectivity for Se(IV) over Se(VI). Using the solid-phase media, pre-concentration of Se(IV) in dilute water samples can be carried out in the field, stabilizing the selenite-selenium in a convenient form for transport and storage. In addition, selenium stored on silica is derived solely from Se(IV) overcoming problems of selenium redox speciation changes and loss during storage. (C) 2003 Published by Elsevier Science B.V.

Subject Keywords

Selenium, Pre-concentration, Speciation, Hydride generation atomic absorption spectrometry

URI

https://hdl.handle.net/11511/30003

Journal

TALANTA

DOI

https://doi.org/10.1016/s0039-9140(03)00154-1

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

Controlled release of vancomycin from biodegradable microcapsules Ozalp, Y; Ozdemir, N; Kocagoz, S; Hasırcı, Vasıf Nejat (2001-01-01) Poly D,L-lactic acid (PLA) and its copolymers with glycolide PLGA 90:10 and 70:30 were polymerized under various conditions to yield polymers in the molecular weight range 12 000-40 000 daltons, as determined by gel permeation chromatography. Vancomycin hydrochloride was the hydrophilic drug of choice for the treatment of methicillin resistant Staphyloccoccal infections. It was microencapsulated in the synthesized polymers using water-oil-water (w/o/w) double emulsion and solvent evaporation. The influence ...
Partial removal of proteins from lactic acid fermentation broth and recovery of proteins from brewery wastes by foam fractionation technique Kurt, Lütfiye; Hamamcı, Haluk; Department of Food Engineering (2006) Foam separation is a simple and economic method for separation of surface-active molecules such as proteins and enzymes from aqueous solutions. In this study, lactic acid broth, spent brewer’s yeast extract and residual beer was used to investigate the applicability and efficiency of foam separation technique in partial purification of fermentation products and recovery of valuable components from industrial waste streams. The effects of the process variables initial feed concentration, air flow rate, foami...
Sensitivity improvement for antimony determination by using in-situ atom trapping in a slotted quartz tube and flame atomic absorption spectrometry TİTRETİR DURAN, SERAP; Sik, Ahmet Inanc; ARSLAN, YASİN; Ataman, Osman Yavuz (2012-11-01) Significant improvement has been achieved for antimony determination using a slotted quartz tube (SQT) as an atom trap (AT) for in situ preconcentration and flame atomic absorption spectrometry (FAAS). The suggested technique consists of trapping analyte species during ordinary nebulization followed by releasing the collected analyte via introducing organic solvent. Procedures and analytical figures of merit have been presented for the techniques called FAAS. SQT-FAAS and finally SQT-AT-FMS with the relevan...
Determination of heavy metal concentration in feed and permeate streams of polymer enhanced ultrafiltration process Muslehiddinoglu, J; Uludağ, Yusuf; Ozbelge, HO; Yılmaz, Levent (1998-08-01) Polymer enhanced ultrafiltration (PEUF) is a newly developed method for the removal of heavy metals from aqueous solutions. This method was applied for the removal of mercury and cadmium with the presence of polyethyleneimine (PEI) as a water soluble polymer. After ultrafiltration experiments for metal-polymer mixtures, two separate streams, namely, retentate and permeate, former of which contains mainly metal-polymer complex and free polymer molecules while latter of which mainly contains free metal ions, ...
Bioinspired synthesis of self-assembled calcium phosphate nanocomposites using block copolymer-peptide conjugates YUSUFOGLU, Yusuf; HU, Yanyan; KANAPATHIPILLAI, Mathumai; KRAMER, Matthew; Kalay, Yunus Eren; THIYAGARAJAN, P.; AKINC, MÜFİT; SCHMIDT-ROHR, Klaus; MALLAPRAGADA, Surya (2008-12-01) Thermoreversibly gelling block copolymers conjugated to hydroxyapatite-nucleating peptides were used to template the growth of inorganic calcium phosphate in aqueous solutions. Nuclear magnetic resonance (NMR). Fourier transform infrared (FTIR), transmission electron microscopy, x-ray diffraction, and small-angle scattering were Used to characterize these samples and confirm that the peptides promoted the growth of hydroxyapatite as the inorganic phase. Three different polymer templates were Used with varyi...

Citation Formats

F. Sahin, M. Volkan, A. Howard, and O. Y. Ataman, “Selective pre-concentration of selenite from aqueous samples using mercapto-silica,” TALANTA, pp. 1003–1009, 2003, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30003.