Chromatography extraction

Subramanian and coworkers developed polymeric sorbents using different support materials (such as Merrifield chloromethylated resin, Amberlite XAD 16) and complexing ligands (amides, phosphonic acids, TTA), and evaluated their binding affinity for U(VI) over other diverse ions, even under high acidities. The practical utility of these sorbents was demonstrated using simulated waste solutions (220-222). Shamsipur et al. reported the solid-phase extraction of ultra trace U(VI) in natural waters using octadecyl silica membrane disks modified by TOPO (223). The method was found satisfactory for the extraction and determination of uranium from different water samples. [Pg.97]

B. Mumgaverl and K. J. Voorhees, On-line supercritical fluid extraction/chromatography system for trace analysis of pesticides in soybean oil and rendered fats , ]. Microcolumn Sep. 3 11-16(1991). [Pg.249]

Martella, L. L. Navratil, J. D. "Recovery of Uranium from Mixed Plutonium-Uranium Residues by an Extraction Chromatography Process," U.S. DOE Rept. RFP-3289, Rockwell International, Golden, Colorado, May 15,1982. [Pg.376]

Separation and detection methods The common methods used to separate the Cr(III)/(VI) species are solvent extraction, chromatography and coprecipitation. In case of Cr(VI) from welding fumes trapped on a filter, a suitable leaching of the Cr(VI) from the sample matrix is needed, without reducing the Cr(VI) species. The most used detection methods for chromium are graphite furnace AAS, chemiluminescence, electrochemical methods, ICP-MS, thermal ionization isotope dilution mass spectrometry and spectrophotometry (Vercoutere and Cornelis 1995)- The separation of the two species is the most delicate part of the procedure. [Pg.79]

Figure 1. Schematic diagram showing a TRU-spec extraction chromatography method for separation of uranium, thorium, protactinium, and radium from a single rock aliquot. Further purification for each element is normally necessary for mass spectrometric analysis. Analysis of a single aliquot reduces sample size requirements and facilitates evaluation of uranium-series dating concordance for volcanic rocks and carbonates. For TIMS work where ionization is negatively influenced by the presence of residual extractant, inert beads are used to help remove dissolved extractant from the eluant.

Burnett WC, Yeh CC (1995) Separation of protactinium from geochemical materials via extraction chromatography. Radioact Radiochem 6 22-32... [Pg.55]

Horwitz EP, Dietz ML, Fisher DE (1991) Separation and preconcentiation of strontinm from biological, environmental, and nuclear waste samples by extraction chromatography nsing a crown ether. Anal Chem 63 522-525... [Pg.57]

Horwitz EP, Dietz ML, Chiarizia R, Diamond H, Essling AM, Graczyk D (1992) Separation and preconcentration of uranium from acidic media by extraction chromatography. Anal Chim Acta 266 25-37... [Pg.57]

Horwitz EP, Chiarizia R, Dietz ML, Diamond H, Nelson DM (1993a) Separation and preconcentration of actinides from acidic media by extraction chromatography. Anal Chim Acta 281 361-372 Horwitz EP, Chiarizia, R., Diamond H, Gatrone RC, Alexandratos SD, Trochimzuk AQ, Crick DW (1993b) Uptake of metal ions by a new chelating ion exchange resin. 1. Acid dependencies of actinide ions. Solvent Extr Ion Exch 11 943-966... [Pg.57]

DOE. 1995b. Separation and analysis of actinides by extraction chromatography coupled with alpha liquid scintillation spectrometry. Washington, DC U.S. Department of Energy. NTIS/DE96060013. [Pg.233]

Goldstein SJ, Hensley CA, Armenta CE, et al,. 1997. Environmental and human monitoring of americium-241 utilizing extraction chromatography and a-spectroscopy. Anal Chem 69 809-812. [Pg.238]

M.L. Lee andK.E. Markides (eds), Analytical Supercritical Fluid Chromatography and Extraction, Chromatography Conferences Inc., Provo, UT (1990). [Pg.162]

Table 7.7 Advantages of on-line solid-phase extraction-chromatography couplings...

Quantitative analysis of multicomponent additive packages in polymers is difficult subject matter, as evidenced by results of round-robins [110,118,119]. Sample inhomogeneity is often greater than the error in analysis. In procedures entailing extraction/chromatography, the main uncertainty lies in the extraction stage. Chromatographic methods have become a ubiquitous part of quantitative chemical analysis. Dissolution procedures (without precipitation) lead to the most reliable quantitative results, provided that total dissolution can be achieved follow-up SEC-GC is molecular mass-limited by the requirements of GC. Of the various solid-state procedures (Table 10.27), only TG, SHS, and eventually Py, lead to easily obtainable accurate quantitation. [Pg.739]

Chromatographic procedures applied to the identification of proteinaceous paint binders tend to be rather detailed consisting of multiple analytical steps ranging from solvent extractions, chromatography clean up, hydrolysis, derivatisation reactions, and measurement to data analysis. Knowledge of the error introduced at each step is necessary to minimise cumulative uncertainty. Reliable results are consequently obtained when laboratory and field blanks are carefully characterised. Additionally, due to the small amounts of analyte and the high sensitivity of the analysis, the instrument itself must be routinely calibrated with amino acid standards along with measurements of certified reference proteins. All of these factors must be taken into account because many times there is only one chance to take the measurement. [Pg.247]

Acrylonitrile metabolites have been measured in blood and urine, but, except for measurement of thiocyanate, these methods have not been developed for routine monitoring of exposed humans. Supercritical fluid extraction/chromatography and immunoassay analysis are two areas of intense current activity from which substantial advances in the determination of acrylonitrile and its metabolites in biological samples can be anticipated. The two techniques are complementary because supercritical fluid extraction is especially promising for the removal of analytes from sample material and immunoassay is very analyte-selective and sensitive (Vanderlaan et al. 1988). [Pg.96]

Braun, R. Ghersini, G. Extraction Chromatography, Elsevier Amsterdam, 1975. [Pg.607]

Shen, J. X. Wang, H. Tadros, S. Hayes, R. N. Orthogonal extraction/ chromatography and UPLC, two powerful new techniques for bioana-lytical quantitation of desloratadine and 3-hydroxydesloratadine at... [Pg.427]

His interests have included such areas of analytical chemistry as separation science, supercritical fluid extraction, chromatography, thermal analysis, and mathematical analysis of the chemical data (chemometrics). [Pg.434]

Serial separation techniques (e.g., extraction, chromatography), with the bioassay as detector are used to demonstrate that the response is due only to the analyte in question. [Pg.120]

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