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Balakrishnan Venkataramani - One of the best experts on this subject based on the ideXlab platform.

  • 8 hydroxyquinoline anchored to silica gel via new moderate size linker synthesis and applicatIons as a metal Ion Collector for their flame atomic absorptIon spectrometric determinatIon
    Talanta, 2003
    Co-Authors: Anupama Goswami, Ajai K Singh, Balakrishnan Venkataramani
    Abstract:

    The silica gel modified with (3-aminopropyl-triethoxysilane) was reacted with 5-formyl-8-hydroxyquinoline (FHOQx) to anchor 8-quinolinol ligand on the silica gel. It was characterised with cross polarisatIon magic angle spinning (CPMAS) NMR and diffuse reflectance infrared Fourier transformatIon (DRIFT) spectroscopy and used for the preconcentratIon of Cu(II), Pb(II), Ni(II), Fe(III), Cd(II), Zn(II) and Co(II) prior to their determinatIon by flame atomic absorptIon spectrometry. The surface area of the modified silica gel has been found to be 227 m2 g^ 1 and the two pKa values as 3.8 and 8.0. The optimum pH ranges for quantitative sorptIon are 4.0-7.0, 4.5-7.0, 3.0-6.0, 5.0-8.0, 5.0-8.0, 5.0-8.0 and 4.0-7.0 for Cu, Pb, Fe, Zn, Co, Ni and Cd, respectively. All the metals can be desorbed with 2.5 mol l^ 1 HCl or HNO 3. The sorptIon capacity for these metal Ions is in range of 92-448.0 mmol g^ 1 and follows the order Cd < Pb < Zn < Co < Ni < Fe < Cu. Tolerance limits for electrolytes NaNO3, NaCl, NaBr, Na2SO4 and Na3PO4, glycine, sodium citrate, EDTA, humic acid and catIons Ca(II), Mg(II), Mn(II) and Cr(III) in the sorptIon of all the seven metal Ions are reported. The preconcentratIon factors are 150, 250, 200, 300, 250, 300 and 200 for Cd, Co, Zn, Cu, Pb, Fe and Ni, respectively and t1/2 values B 1 min except for Ni. The 95% extractIon by batch method takes < 25 min. The simultaneous enrichment and determinatIon of all the metals are possible if the total load of the metal Ions is less than sorptIon capacity. In river water samples all these metal Ions were enriched with the present ligand anchored silica gel and determined with flame atomic absorptIon spectrometer (R.S.D. < 6.4%). Cobalt contents of pharmaceutica l samples (vitamin tablet) were preconcentrated with the present chelating silica gel and estimated by flame AAS, with R.S.D. ~ 1.4%. The results are in the good agreement with the certified value, 1.99 mg g^ 1 of the tablets. Iron and copper in certified reference materials (synthetic) SLRS-4 and SLEW-3 have been enriched with the modified silica gel and estimated with R.S.D. < 5%.

  • 8 hydroxyquinoline anchored to silica gel via new moderate size linker synthesis and applicatIons as a metal Ion Collector for their flame atomic absorptIon spectrometric determinatIon
    Talanta, 2003
    Co-Authors: Anupama Goswami, Ajai K Singh, Balakrishnan Venkataramani
    Abstract:

    The silica gel modified with (3-aminopropyl-triethoxysilane) was reacted with 5-formyl-8-hydroxyquinoline (FHOQ(x)) to anchor 8-quinolinol ligand on the silica gel. It was characterised with cross polarisatIon magic angle spinning (CPMAS) NMR and diffuse reflectance infrared Fourier transformatIon (DRIFT) spectroscopy and used for the preconcentratIon of Cu(II), Pb(II), Ni(II), Fe(III), Cd(II), Zn(II) and Co(II) prior to their determinatIon by flame atomic absorptIon spectrometry. The surface area of the modified silica gel has been found to be 227 m(2) g(-1) and the two pKa values as 3.8 and 8.0. The optimum pH ranges for quantitative sorptIon are 4.0-7.0, 4.5-7.0, 3.0-6.0, 5.0-8.0, 5.0-8.0, 5.0-8.0 and 4.0-7.0 for Cu, Pb, Fe, Zn, Co, Ni and Cd, respectively. All the metals can be desorbed with 2.5 mol l(-1) HCl or HNO(3). The sorptIon capacity for these metal Ions is in range of 92-448.0 micromol g(-1) and follows the order CdIons Ca(II), Mg(II), Mn(II) and Cr(III) in the sorptIon of all the seven metal Ions are reported. The preconcentratIon factors are 150, 250, 200, 300, 250, 300 and 200 for Cd, Co, Zn, Cu, Pb, Fe and Ni, respectively and t(1/2) values <1 min except for Ni. The 95% extractIon by batch method takes < or =25 min. The simultaneous enrichment and determinatIon of all the metals are possible if the total load of the metal Ions is less than sorptIon capacity. In river water samples all these metal Ions were enriched with the present ligand anchored silica gel and determined with flame atomic absorptIon spectrometer (R.S.D.< or =6.4%). Cobalt contents of pharmaceutical samples (vitamin tablet) were preconcentrated with the present chelating silica gel and estimated by flame AAS, with R.S.D. approximately 1.4%. The results are in the good agreement with the certified value, 1.99 microg g(-1) of the tablets. Iron and copper in certified reference materials (synthetic) SLRS-4 and SLEW-3 have been enriched with the modified silica gel and estimated with R.S.D.<5%.

Anupama Goswami - One of the best experts on this subject based on the ideXlab platform.

  • 8 hydroxyquinoline anchored to silica gel via new moderate size linker synthesis and applicatIons as a metal Ion Collector for their flame atomic absorptIon spectrometric determinatIon
    Talanta, 2003
    Co-Authors: Anupama Goswami, Ajai K Singh, Balakrishnan Venkataramani
    Abstract:

    The silica gel modified with (3-aminopropyl-triethoxysilane) was reacted with 5-formyl-8-hydroxyquinoline (FHOQx) to anchor 8-quinolinol ligand on the silica gel. It was characterised with cross polarisatIon magic angle spinning (CPMAS) NMR and diffuse reflectance infrared Fourier transformatIon (DRIFT) spectroscopy and used for the preconcentratIon of Cu(II), Pb(II), Ni(II), Fe(III), Cd(II), Zn(II) and Co(II) prior to their determinatIon by flame atomic absorptIon spectrometry. The surface area of the modified silica gel has been found to be 227 m2 g^ 1 and the two pKa values as 3.8 and 8.0. The optimum pH ranges for quantitative sorptIon are 4.0-7.0, 4.5-7.0, 3.0-6.0, 5.0-8.0, 5.0-8.0, 5.0-8.0 and 4.0-7.0 for Cu, Pb, Fe, Zn, Co, Ni and Cd, respectively. All the metals can be desorbed with 2.5 mol l^ 1 HCl or HNO 3. The sorptIon capacity for these metal Ions is in range of 92-448.0 mmol g^ 1 and follows the order Cd < Pb < Zn < Co < Ni < Fe < Cu. Tolerance limits for electrolytes NaNO3, NaCl, NaBr, Na2SO4 and Na3PO4, glycine, sodium citrate, EDTA, humic acid and catIons Ca(II), Mg(II), Mn(II) and Cr(III) in the sorptIon of all the seven metal Ions are reported. The preconcentratIon factors are 150, 250, 200, 300, 250, 300 and 200 for Cd, Co, Zn, Cu, Pb, Fe and Ni, respectively and t1/2 values B 1 min except for Ni. The 95% extractIon by batch method takes < 25 min. The simultaneous enrichment and determinatIon of all the metals are possible if the total load of the metal Ions is less than sorptIon capacity. In river water samples all these metal Ions were enriched with the present ligand anchored silica gel and determined with flame atomic absorptIon spectrometer (R.S.D. < 6.4%). Cobalt contents of pharmaceutica l samples (vitamin tablet) were preconcentrated with the present chelating silica gel and estimated by flame AAS, with R.S.D. ~ 1.4%. The results are in the good agreement with the certified value, 1.99 mg g^ 1 of the tablets. Iron and copper in certified reference materials (synthetic) SLRS-4 and SLEW-3 have been enriched with the modified silica gel and estimated with R.S.D. < 5%.

  • 8 hydroxyquinoline anchored to silica gel via new moderate size linker synthesis and applicatIons as a metal Ion Collector for their flame atomic absorptIon spectrometric determinatIon
    Talanta, 2003
    Co-Authors: Anupama Goswami, Ajai K Singh, Balakrishnan Venkataramani
    Abstract:

    The silica gel modified with (3-aminopropyl-triethoxysilane) was reacted with 5-formyl-8-hydroxyquinoline (FHOQ(x)) to anchor 8-quinolinol ligand on the silica gel. It was characterised with cross polarisatIon magic angle spinning (CPMAS) NMR and diffuse reflectance infrared Fourier transformatIon (DRIFT) spectroscopy and used for the preconcentratIon of Cu(II), Pb(II), Ni(II), Fe(III), Cd(II), Zn(II) and Co(II) prior to their determinatIon by flame atomic absorptIon spectrometry. The surface area of the modified silica gel has been found to be 227 m(2) g(-1) and the two pKa values as 3.8 and 8.0. The optimum pH ranges for quantitative sorptIon are 4.0-7.0, 4.5-7.0, 3.0-6.0, 5.0-8.0, 5.0-8.0, 5.0-8.0 and 4.0-7.0 for Cu, Pb, Fe, Zn, Co, Ni and Cd, respectively. All the metals can be desorbed with 2.5 mol l(-1) HCl or HNO(3). The sorptIon capacity for these metal Ions is in range of 92-448.0 micromol g(-1) and follows the order CdIons Ca(II), Mg(II), Mn(II) and Cr(III) in the sorptIon of all the seven metal Ions are reported. The preconcentratIon factors are 150, 250, 200, 300, 250, 300 and 200 for Cd, Co, Zn, Cu, Pb, Fe and Ni, respectively and t(1/2) values <1 min except for Ni. The 95% extractIon by batch method takes < or =25 min. The simultaneous enrichment and determinatIon of all the metals are possible if the total load of the metal Ions is less than sorptIon capacity. In river water samples all these metal Ions were enriched with the present ligand anchored silica gel and determined with flame atomic absorptIon spectrometer (R.S.D.< or =6.4%). Cobalt contents of pharmaceutical samples (vitamin tablet) were preconcentrated with the present chelating silica gel and estimated by flame AAS, with R.S.D. approximately 1.4%. The results are in the good agreement with the certified value, 1.99 microg g(-1) of the tablets. Iron and copper in certified reference materials (synthetic) SLRS-4 and SLEW-3 have been enriched with the modified silica gel and estimated with R.S.D.<5%.

J S Becker - One of the best experts on this subject based on the ideXlab platform.

  • inorganic mass spectrometry principles and applicatIons
    2007
    Co-Authors: J S Becker
    Abstract:

    Contents. Preface. Acknowledgement. IntroductIon to mass spectrometry. 1. History of mass spectrometric techniques. 2. Ion sources. 2.1.Inductively coupled plasma Ion source. 2.1.1.Laser ablatIon coupled to an inductively coupled plasma source. 2.1.2.Electrothermal vaporizatIon coupled to an inductively coupled plasma source. 2.1.3.Hydride generatIon and cold vapor technique for sample introductIon in an ICP source. 2.2.Spark Ion source. 2.3.Laser Ion source. 2.3.1. Non-resonant laser IonizatIon. 2.3.2. Resonant laser IonizatIon. 2.4.Glow discharge Ion source 2.5.Thermal surface Ion source. 2.6. Ion sources for secondary Ion mass spectrometry (SIMS) and sputtered neutral mass spectrometry (SNMS) 2.7.Electron impact Ion source. 2.8.Matrix assisted laser desorptIon/ IonizatIon source. 2.9.Electrospray Ion source. 3.Ion separatIon systems. 3.1 Sector field analyser. 3.1.1. Magnetic sector field analyser. 3.1.2. Electric sector field analyser. 3.1.3. CombinatIon of magnetic and electric sector fields - double focusing sector field mass spectrometer 3.2.Dynamic separatIon systems. 3.2.1. Quadrupole mass analyzer. 3.2.2. Time-of-flight analyser 3.2.3. Ion trap mass analyzer. 3.2.4. Ion cyclotron resonance mass analyser. 3.3. Mass resolutIon and abundance sensitivity. 4. Ion detectIon systems 4.1. Faraday cup. 4.2. Secondary electron multiplier. 4.3. CombinatIon of Faraday cup and secondary electron multiplier. 4.4. Channel electron multiplier. 4.5. Daly detector. 4.6. Multiple Ion collectIon system. 4.7. Fluorescence screen and photographic Ion detectIon. 5.InstrumentatIon 5.1. Inductively coupled plasma mass spectrometers (ICP-MS). 5.1.1. Quadrupole based ICP mass spectrometers (ICP-QMS). 5.1.2. ICP mass spectrometers with collisIon or dynamic reactIon cell or collisIon reactIon interface. 5.1.3. Double focusing sector field ICP mass spectrometers with single Ion Collector (ICP-SFMS). 5.1.4. Time-of-flight mass spectrometers (ToF-MS) 5.1.5. Multiple Ion Collector ICP mass spectrometers (MC-ICP-MS). 5.1.6. SolutIon introductIon systems in ICP-MS. 5.1.6.1. Pneumatic nebulizers including selected micronebulizers. 5.1.6.2. Ultrasonic nebulizer. 5.1.7 Hydride generatIon and cold vapor technique. 5.1.8 Flow injectIon technique and hyphenated techniques. 5.1.9 Laser ablatIon ICP-MS (LA-ICP-MS). 5.2. Spark source mass spectrometers (SSMS) 5.3. Laser IonizatIon mass spectrometers (LIMS). 5.4. Resonance IonizatIon mass spectrometers (RIMS). 5.5. Glow discharge mass spectrometers (GDMS). 5.6. Termal IonizatIon mass spectrometers (TIMS). 5.7. Secondary Ion mass spectrometers (SIMS) and sputted neutral mass spectrometers.(SNMS). 5.8. Accelerator mass spectrometers (AMS) 5.9. Electron impact mass spectrometers. 5.10. Knudsen effusIon mass spectrometers. 6. Analytical and practical consideratIons. 6.1. Qualitative analysis by inorganic mass spectrometry. 6.1.1. Isotopic pattern. 6.1.2. Mass determinatIon. 6.1.3. Interference problems. 6.2. QuantificatIon procedures in inorganic mass spectrometry. 6.2.1. Semi-quantitative analysis. 6.2.2. One point calibratIon in solid sate mass spectrometry using a certified reference material. 6.2.3. QuantificatIon of analytical data via calibratIon curves in mass spectrometry using certified reference materials or defined standard solutIons. 6.2.4. Isotope dilutIon technique. 6.2.5. QuantificatIon in solid state mass spectrometry using synthetic laboratory standards. 6.2.6. SolutIon based calibratIon in LA-ICP-MS. 6.2.6.1. External calibratIon technique in solutIon based calibratIon in LA-ICP-MS. 6.2.6.2. Standard additIon technique in solutIon based calibratIon in LA-ICP-MS. 6.2.6.3. On-line isotope dilutIon in solutIon based calibratIon in LA-ICP-MS. 6.3. Sample preparatIon and pretreatment in inorganic mass spectrometry. 6.3.1. Sample preparatIon for analysis of solids. 6.3.2. Sample preparatIon for ICP-MS. 6.3.3. Trace matrix separatIon and preconcentratIon steps. 7.Mass spectrometric techniques for analysis of gaseous materials and volatile compounds. 7.1. Sampling and sample preparatIon of gases and volatile compounds 7.2. ApplicatIons of inorganic mass spectrometry for analysis of gases and volatile compounds. 7.3. Stable isotope ratio measurements of gases and volatile compounds. 8. Isotope ratio measurements and their applicatIon 8.1. Capability of inorganic mass spectrometry in isotope ratio measurements 8.2. Limits for precisIon and accuracy of isotope ratio measurements and how to solve the problems 8.3. Isotope ratio measurements by gas source mass spectrometry. 8.4. Isotope ratio measurements by quadrupole based ICP-MS. 8.5. Isotope ratio measurements by laser ablatIon ICP-MS 8.6. Multiple Ion Collector mass spectrometry for high precise isotope ratio measurements 8.7. ApplicatIon of isotope dilutIon technique 8.8. Isotope analysis of long-lived radIonuclides 8.9. ApplicatIon of isotope ratio measurements in geochemistry and geochronology 9. Fields of applicatIon of inorganic and mass spectrometry in trace, ultratrace and surface analysis. 9.1. Material science. 9.1.1. Trace and ultratrace (bulk) analysis of metals and alloys. 9.1.2. Semiconductors. 9.1.3. Ceramics, glasses, polymers and other non-conductors 9.1.4. Thin and thick film analysis. 9.1.5. Analysis of surface contaminatIon and of process chemicals used in semiconductor technology 9.1.6. Microlocal analysis in material research. 9.1.7. Imaging mass spectrometry in material research. 9.2. Environmental science and environmental control. 9.2.1. Analysis of water samples. 9.2.2. Analysis of air samples, particles and smoke 9.2.3. Multielemental analysis of environmental samples for environmental control. 9.2.4. Environmental monitoring of selected elements, group elements and trace element species 9.2.5. Isotope ratio measurements in environmental samples. 9.2.6. Monitoring of radIonuclides in the environment 9.3. Biology. 9.3.1. Multielement analysis on biological samples 9.3.2. Elemental speciatIon in biological samples 9.3.3. Analysis of P, metals and metalloids bounded to proteins 9.3.4. Isotope ratio measurements of biological systems 9.3.5. Trace and imaging analysis on biological tissues and single cells 9.4. Bioengineering 9.4.1. Activities in bioengineering and analytics. 9.4.2. Nanobiotechnology. 9.5.Medicine. 9.5.1. Sampling, sample handling and storage of medical samples. 9.5.2. Body fluid. 9.5.2.1. Analysis of blood and serum. 9.5.2.2. Analysis of urine. 9.5.3. Hair, nail, tooth and bone analysis. 9.5.4. Microanalysis of small amount of medical samples. 9.5.5. P, S, Se and metal determinatIon in proteins. 9.5.6. Analysis of tissues. 9.5.7. Imaging mass spectrometry on medical tissues. 9.5.8. Single cell analysis. 9.5.9. Ultrafine particles and health. 9.6. Food analysis. 9.6.1. DeterminatIon of trace elements and species in foodstuffs. 9.6.2. Analysis of mineral and bottle water. 9.6.3. Fingerprinting of foods by trace analysis and isotope ratio measurements. 9.7. Geology and geochemistry. 9.7.1. Sample preparatIon techniques of geological samples. 9.7.2. FractIonatIon effects in LA-ICP-MS. 9.7.3. Multielementanalysis of geological samples. 9.7.4. Trace analysis of selected elements in geological materials 9.7.5. Isotope analysis including age determinatIon of minerals and rocks by mass spectrometry. 9.7.5.1. Study of isotope fine variatIon in nature. 9.7.5.2. Age dating methods in geosciences. - U - Pb, Th - Pb and Pb-Pb methods for age dating. - Rb - Sr method for age dating. - Sm-Nd method for age dating. - Lu-Hf-method for age dating. - Re-Os-method for age dating - K-Ar/Ca-system for age dating. - 14C dating 9.7.6. Mass spectrometric microlocal and imaging analysis of geological samples. 9.8. Cosmochemistry, planetary and space science. 9.8.1. Cosmochemical trace analysis. 9.8.2. Isotope analysis in cosmochemistry. 9.8.3. Cosmogenic radIonuclides and age dating. 9.9.DeterminatIon of long-lived radIonuclides. 9.9.1. DeterminatIon of half live of long-lived radIonuclides. 9.9.2 Methodical developments and applicatIons of ICP-MS for determinatIon of long-lived radIonuclides including trace/matrix separatIon. 9.9.3. Ultratrace analysis of long-lived radIonuclides in very small sample volumes. 9.9.4. DeterminatIon of long-lived radIonuclides by LA-ICP-MS and ETV-ICP-MS. 9.9.5. Particle analysis by inorganic mass spectrometry. 9.10. Forensic applicatIon. 9.10.1. Fingerprinting in forensic studies. 9.10.2. Multielement analysis for forensic studies. 9.10.3. Trace element analysis of selected elements and speciatIon. 9.10.4. Nuclear forensic studies. 9.10.5. Forensic investigatIons by isotope ratio measurements. 9.11. Study of cluster and polyatomic Ion formatIon by mass spectrometry. 9.11.1. Carbon and boron nitride cluster Ion formatIon. 9.11.2. FormatIon of selected heteronuclear cluster Ions. 9.11.3. Cluster Ions from metal oxide/graphite mixture 9.11.4. Argon diatomic Ions. 9.11.5. Oxide Ion formatIon of long-lived radIonuclides in ICP-MS. 9.12.Further applicatIons. 9.12.1.Pharmaceutical applicatIons and analysis of drugs. 9.12.2.Archaeology. 10.Future developments. APPENDIX. Appendix I:Table of isotopic abundances, atomic mass and IonizatIon energies of elements. Appendix II: Table of atomic weights of elements. Appendix III: DefinitIon. Appendix IV: AbbreviatIons and Acronyms. Appendix V: List of standard reference materials for isotope ratio measurements.

  • mass spectrometry of long lived radIonuclides
    Spectrochimica Acta Part B: Atomic Spectroscopy, 2003
    Co-Authors: J S Becker
    Abstract:

    Abstract The capability of determining element concentratIons at the trace and ultratrace level and isotope ratios is a main feature of inorganic mass spectrometry. The precise and accurate determinatIon of isotope ratios of long-lived natural and artificial radIonuclides is required, e.g. for their environmental monitoring and health control, for studying radIonuclide migratIon, for age dating, for determining isotope ratios of radiogenic elements in the nuclear industry, for quality assurance and determinatIon of the burn-up of fuel material in a nuclear power plant, for reprocessing plants, nuclear material accounting and radioactive waste control. Inorganic mass spectrometry, especially inductively coupled plasma mass spectrometry (ICP-MS) as the most important inorganic mass spectrometric technique today, possesses excellent sensitivity, precisIon and good accuracy for isotope ratio measurements and practically no restrictIon with respect to the IonizatIon potential of the element investigated—therefore, thermal IonizatIon mass spectrometry (TIMS), which has been used as the dominant analytical technique for precise isotope ratio measurements of long-lived radIonuclides for many decades, is being replaced increasingly by ICP-MS. In the last few years instrumental progress in improving figures of merit for the determinatIon of isotope ratio measurements of long-lived radIonuclides in ICP-MS has been achieved by the applicatIon of a multiple Ion Collector device (MC-ICP-MS) and the introductIon of the collisIon cell interface in order to dissociate disturbing argon-based molecular Ions, to reduce the kinetic energy of Ions and neutralize the disturbing noble gas Ions (e.g. of 129Xe+ for the determinatIon of 129I). The review describes the state of the art and the progress of different inorganic mass spectrometric techniques such as ICP-MS, laser ablatIon ICP-MS vs. TIMS, glow discharge mass spectrometry, secondary Ion mass spectrometry, resonance IonizatIon mass spectrometry and accelerator mass spectrometry for the determinatIon of long-lived radIonuclides in quite different materials.

Ajai K Singh - One of the best experts on this subject based on the ideXlab platform.

  • 8 hydroxyquinoline anchored to silica gel via new moderate size linker synthesis and applicatIons as a metal Ion Collector for their flame atomic absorptIon spectrometric determinatIon
    Talanta, 2003
    Co-Authors: Anupama Goswami, Ajai K Singh, Balakrishnan Venkataramani
    Abstract:

    The silica gel modified with (3-aminopropyl-triethoxysilane) was reacted with 5-formyl-8-hydroxyquinoline (FHOQx) to anchor 8-quinolinol ligand on the silica gel. It was characterised with cross polarisatIon magic angle spinning (CPMAS) NMR and diffuse reflectance infrared Fourier transformatIon (DRIFT) spectroscopy and used for the preconcentratIon of Cu(II), Pb(II), Ni(II), Fe(III), Cd(II), Zn(II) and Co(II) prior to their determinatIon by flame atomic absorptIon spectrometry. The surface area of the modified silica gel has been found to be 227 m2 g^ 1 and the two pKa values as 3.8 and 8.0. The optimum pH ranges for quantitative sorptIon are 4.0-7.0, 4.5-7.0, 3.0-6.0, 5.0-8.0, 5.0-8.0, 5.0-8.0 and 4.0-7.0 for Cu, Pb, Fe, Zn, Co, Ni and Cd, respectively. All the metals can be desorbed with 2.5 mol l^ 1 HCl or HNO 3. The sorptIon capacity for these metal Ions is in range of 92-448.0 mmol g^ 1 and follows the order Cd < Pb < Zn < Co < Ni < Fe < Cu. Tolerance limits for electrolytes NaNO3, NaCl, NaBr, Na2SO4 and Na3PO4, glycine, sodium citrate, EDTA, humic acid and catIons Ca(II), Mg(II), Mn(II) and Cr(III) in the sorptIon of all the seven metal Ions are reported. The preconcentratIon factors are 150, 250, 200, 300, 250, 300 and 200 for Cd, Co, Zn, Cu, Pb, Fe and Ni, respectively and t1/2 values B 1 min except for Ni. The 95% extractIon by batch method takes < 25 min. The simultaneous enrichment and determinatIon of all the metals are possible if the total load of the metal Ions is less than sorptIon capacity. In river water samples all these metal Ions were enriched with the present ligand anchored silica gel and determined with flame atomic absorptIon spectrometer (R.S.D. < 6.4%). Cobalt contents of pharmaceutica l samples (vitamin tablet) were preconcentrated with the present chelating silica gel and estimated by flame AAS, with R.S.D. ~ 1.4%. The results are in the good agreement with the certified value, 1.99 mg g^ 1 of the tablets. Iron and copper in certified reference materials (synthetic) SLRS-4 and SLEW-3 have been enriched with the modified silica gel and estimated with R.S.D. < 5%.

  • 8 hydroxyquinoline anchored to silica gel via new moderate size linker synthesis and applicatIons as a metal Ion Collector for their flame atomic absorptIon spectrometric determinatIon
    Talanta, 2003
    Co-Authors: Anupama Goswami, Ajai K Singh, Balakrishnan Venkataramani
    Abstract:

    The silica gel modified with (3-aminopropyl-triethoxysilane) was reacted with 5-formyl-8-hydroxyquinoline (FHOQ(x)) to anchor 8-quinolinol ligand on the silica gel. It was characterised with cross polarisatIon magic angle spinning (CPMAS) NMR and diffuse reflectance infrared Fourier transformatIon (DRIFT) spectroscopy and used for the preconcentratIon of Cu(II), Pb(II), Ni(II), Fe(III), Cd(II), Zn(II) and Co(II) prior to their determinatIon by flame atomic absorptIon spectrometry. The surface area of the modified silica gel has been found to be 227 m(2) g(-1) and the two pKa values as 3.8 and 8.0. The optimum pH ranges for quantitative sorptIon are 4.0-7.0, 4.5-7.0, 3.0-6.0, 5.0-8.0, 5.0-8.0, 5.0-8.0 and 4.0-7.0 for Cu, Pb, Fe, Zn, Co, Ni and Cd, respectively. All the metals can be desorbed with 2.5 mol l(-1) HCl or HNO(3). The sorptIon capacity for these metal Ions is in range of 92-448.0 micromol g(-1) and follows the order CdIons Ca(II), Mg(II), Mn(II) and Cr(III) in the sorptIon of all the seven metal Ions are reported. The preconcentratIon factors are 150, 250, 200, 300, 250, 300 and 200 for Cd, Co, Zn, Cu, Pb, Fe and Ni, respectively and t(1/2) values <1 min except for Ni. The 95% extractIon by batch method takes < or =25 min. The simultaneous enrichment and determinatIon of all the metals are possible if the total load of the metal Ions is less than sorptIon capacity. In river water samples all these metal Ions were enriched with the present ligand anchored silica gel and determined with flame atomic absorptIon spectrometer (R.S.D.< or =6.4%). Cobalt contents of pharmaceutical samples (vitamin tablet) were preconcentrated with the present chelating silica gel and estimated by flame AAS, with R.S.D. approximately 1.4%. The results are in the good agreement with the certified value, 1.99 microg g(-1) of the tablets. Iron and copper in certified reference materials (synthetic) SLRS-4 and SLEW-3 have been enriched with the modified silica gel and estimated with R.S.D.<5%.

Sabine J Becker - One of the best experts on this subject based on the ideXlab platform.

  • inductively coupled plasma mass spectrometry icp ms and laser ablatIon icp ms for isotope analysis of long lived radIonuclides
    International Journal of Mass Spectrometry, 2005
    Co-Authors: Sabine J Becker
    Abstract:

    For a few years now inductively coupled plasma mass spectrometry has been increasingly used for precise and accurate determinatIon of isotope ratios of long-lived radIonuclides at the trace and ultratrace level due to its excellent sensitivity, good precisIon and accuracy. At present, ICP-MS and also laser ablatIon ICP-MS are applied as powerful analytical techniques in different fields such as the characterizatIon of nuclear materials, recycled and by-products (e.g., spent nuclear fuel or depleted uranium ammunitIons), radioactive waste control, in environmental monitoring and in bioassay measurements, in health control, in geochemistry and geochronology. Especially double-focusing sector field ICP mass spectrometers with single Ion detector or with multiple Ion Collector device have been used for the precise determinatIon of long-lived radIonuclides isotope ratios at very low concentratIon levels. Progress has been achieved by the combinatIon of ultrasensitive mass spectrometric techniques with effective separatIon and enrichment procedures in order to improve detectIon limits or by the introductIon of the collisIon cell in ICP-MS for reducing disturbing interfering Ions (e.g., of 129Xe+ for the determinatIon of 129I). This review describes the state of the art and the progress of ICP-MS and laser ablatIon ICP-MS for isotope ratio measurements of long-lived radIonuclides in different sample types, especially in the main applicatIon fields of characterizatIon of nuclear and radioactive waste material, environmental research and health controls.

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