Extraction chromatography, using

Mohapatra, P.K. Sriram, S. Manchanda, V.K. Badheka, L.P. Uptake of metal ions by extraction chromatography using dimethyl dibutyl tetradecyl-l,3-malonamide (DMDBTDMA) as the stationary phase, Sep. Sci. Technol. 35 (1999) 39-55. 

Arisaka, M., Watanabe, M., Kimura, T. 2007. Separation of actinides(EH) from lanthanides(III) by extraction chromatography using new N,N -dialkyl-N,N -diphenylpyridine-2,6-dicarboxyamides. Global 2007 Advanced Nuclear Fuel Cycles and Systems, September, Boise, ID. 

In 1994, Dadfarnia and McLeod described the analysis of uranium in surface waters and sea water using a simple FI system with an alumina column for preconcentration.77 Species eluted from this column were delivered to an ICP-MS as the detector. Also in 1994, Hollenbach et al. described the automation of extraction chromatographic methods based on TRU-Resin and TEVA-Resin to separate and preconcentrate U, Th, and Tc from soil samples, using ICP-MS for detection.49125 In 1996, Aldstadt et al. described the use of FI and extraction chromatography using TRU-Resin to determine U in environmental samples by ICP-MS.78... 

Horwitz, E. P., Dietz, M. L., Chiarizia, R., Diamond, H., Maxwell, S. L., and Nelson, M. R., Separation and preconcentration of actinides by extraction chromatography using a supported liquid anion exchanger Application to the characterization of high-level nuclear waste solutions, Anal. Chim. Acta, 310, 63-78, 1995. 

Gje9i, E. Analysis of Sr in environmental and biological samples by extraction chromatography using a crown ether. J. Radioanal. Nucl. Chem. 213(3), 165-174 (1996)... 

Procedure. Americium in the combined wash and ICE is removed by liquid-liquid extraction or extraction chromatography using bldentate. 

Laboratory results have shown that americium can be recovered and purified by both solvent extraction and extraction chromatography using the bidentate DHDECMP. Solvent extraction recovery of americium was demonstrated on a pilot plant scale. 

Trowell Separation of Pu before spectrographic analysis of impurities in high purity Pu metal (extraction chromatography using TBP) 148... 

As with Md, the physical separation of the nobelium atoms from the target material can be made using the recoil-atom catcher technique. It is preferable to combine this with the gas jet technique since the atoms are deposited on the catcher foil in nearly a monolayer and can be easily rinsed off the surface with dilute acid without complete dissolution of the foil. Isolation of the No from other actinides produced in the bombardment and from any target material transferred to the foil can be readily made using schemes based on the separation of divalent ions from trivalent ones, e.g. selective elution by solvent extraction chromatography using HDEHP as the stationary organic phase and 0.05 n HCl... 

A solution of At-(tcrt-butoxycarbonyl)-6-methoxy-2-methylaniline (11.9 g, 50 mmol) was cooled to — 40°C and s-BuLi (96 ml of 1.3 M in cyclohexane. 125mmol) was added. The mixture was stirred at —45°C to —55°Cfor 30min and then allowed to warm slowly to — 15"C over 60 min. The yellow solution was recooled to —45 C and DMF (5.8 ml, 75 mmol) was added. After 5 min the reaction mixture was diluted with water (250 ml) and the product was extracted with EtOAc (2 x 150 ml). The extract was washed with w ater (200ml) and then concentrated in vacuo. The residue was dissolved in THF (100 ml) and 12 N HCl (2 ml) was added. The solution was stirred for 5 min at room temperature and then diluted with ether (250 ml). The solution was washed with water (250 ml), sat. aq. NaHCOj (250 ml), and brine (250 ml), dried (Na2S04) and evaporated. The product was purified by chromatography using 2% EtOAc in hexane for elution. The yield (9.3 g) was 75%. 

Rhodamine B chloride [3,5-his-(diethylamino)-9-(2-carboxyphenyl)xanthylium chloride] [81-88-9] M 479.0, m 210-211"(dec), Cl 45170, A,max 543nm, Free base [509-34-2] Cl 749, pK 5.53. Major impurities are partially dealkylated compounds not removed by crystn. Purified by chromatography, using ethyl acetate/isopropanol/ammonia (conc)(9 7 4, Rp 0.75 on Kieselgel G). Also crystd from cone soln in MeOH by slow addition of dry diethyl ether or from EtOH containing a drop of cone HCl by slow addition of ten volumes of dry diethyl ether. The solid was washed with ether and air dried. The dried material has also been extracted with benzene to remove oil-soluble material prior to recrystn. Store in the dark. 

Figure 2.16 Clirotnatograms of a pentane extract of a water sample containing 200 ppb of a naphtha fraction (a) sample extracted by using a continuous flow system, where a pressurized bottle was employed as the sample-delivery system (b) batch-extracted sample. Reprinted from Journal of Chromatography, A 330, J. Roeraade, Automated monitoring of organic Race components in water. I. Continuous flow exti action together with on-line capillary gas cliro-matography , pp. 263 - 274, copyrigth 1985, with permission from Elsevier Science.

Multidimensional gas chromatography has also been used in the qualitative analysis of contaminated environmental extracts by using spectral detection techniques Such as infrared (IR) spectroscopy and mass spectrometry (MS) (20). These techniques produce the most reliable identification only when they are dealing with pure substances this means that the chromatographic process should avoid overlapping of the peaks. 

The course of the fermentation is tested by removal of samples which are extracted with methyl isobutyl ketone. The extracts are analyzed by thin layer chromatography using a system of benzene/ethyl acetate (4 1). 

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. 

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