Zobrazeno 1 - 10
of 26
pro vyhledávání: '"Assad S. Al-Ammar"'
Autor:
Assad S. Al-Ammar
Publikováno v:
Spectrochimica Acta Part B: Atomic Spectroscopy. 58:1391-1401
The common analyte internal standardization (CAIS) chemometric technique is extended to correct for drift in signal intensity in inductively coupled plasma-mass spectrometry. The CAIS technique is used because, unlike the conventional internal refere
Autor:
Michael Wiedenbeck, Sabine Tonn, G. Ferrara, Naoji Sugiura, Yingkai Xiao, Ramon M. Barnes, Annette Deyhle, Urs Krähenbühl, Marcus Astner, Roberto Gonfiantini, Randy L. Bassett, Alessandra Adorni-Braccesi, Samuel Wunderli, Regina Surberg, Catherine Guerrot, Sonia Tonarini, Manfred Gröning, Maddalena Pennisi, Ilia Rodushkin, Graham D. Layne, Damien Lemarchand, Alain Cocherie, Andrea Dini, Judith Grimm, Jérôme Gaillardet, D. Jack Northington, Sebastien Bächler, Thomas Zack, Eva Reitznerová, Assad S. Al-Ammar, Anette Meixner
Publikováno v:
Geostandards newsletter 27 (2003): 41–57.
info:cnr-pdr/source/autori:Gonfiantini R.(1); Tonarini S.(1); Gröning M.(2); Adorni-Braccesi A.(1); Al-Ammar A. S.(3); Astner M.(4); Bächler S.(4); Barnes R. M.(3); Bassett R; L. (5), Cocherie A.(6); Deyhle A. (7); Dini A.(1); Ferrara G.(1); Gaillardet, J. (8); Grimm, J. (4); Guerrot, C. (6); Krahenbulh, U. (4); Layne, G.(9); Lemarchand, D. (8); Meixer, A.(10); Northington, D.J.(11); Pennisi, M. (1); Reitznerova, E.(3); Rodushkin, I.(12); Sugiura, N.(13); Surberg, R.(7); Tonn, S.(10); Wiedenbeck, M.(10); Wunderli, S.(14); Xiao, Y.(15); Zack, T (16)./titolo:Intercomparison of boron isotope and concentration measurements. Part II: Evaluation of results./doi:/rivista:Geostandards newsletter/anno:2003/pagina_da:41/pagina_a:57/intervallo_pagine:41–57/volume:27
info:cnr-pdr/source/autori:Gonfiantini R.(1); Tonarini S.(1); Gröning M.(2); Adorni-Braccesi A.(1); Al-Ammar A. S.(3); Astner M.(4); Bächler S.(4); Barnes R. M.(3); Bassett R; L. (5), Cocherie A.(6); Deyhle A. (7); Dini A.(1); Ferrara G.(1); Gaillardet, J. (8); Grimm, J. (4); Guerrot, C. (6); Krahenbulh, U. (4); Layne, G.(9); Lemarchand, D. (8); Meixer, A.(10); Northington, D.J.(11); Pennisi, M. (1); Reitznerova, E.(3); Rodushkin, I.(12); Sugiura, N.(13); Surberg, R.(7); Tonn, S.(10); Wiedenbeck, M.(10); Wunderli, S.(14); Xiao, Y.(15); Zack, T (16)./titolo:Intercomparison of boron isotope and concentration measurements. Part II: Evaluation of results./doi:/rivista:Geostandards newsletter/anno:2003/pagina_da:41/pagina_a:57/intervallo_pagine:41–57/volume:27
The Istituto di Geoscienze e Georisorse (IGG), on behalf and with the support of the International Atomic Energy Agency (IAEA), prepared eight geological materials (three natural waters and five rocks and minerals), intended for a blind interlaborato
Publikováno v:
Spectrochimica Acta Part B: Atomic Spectroscopy. 56:1951-1962
An on-channel sample preconcentration-matrix removal arrangement, based on coupling field-flow fractionation (FFF) to inductively coupled plasma mass spectrometry (ICP-MS), has been constructed for on-line sample pretreatment ICP-MS trace element det
Publikováno v:
Analytical and Bioanalytical Chemistry. 370:479-482
Thorium and iodine memory effects have been characterized experimentally for inductively-coupled plasma mass spectrometry by adding ammonia gas directly to the spray chamber and nebulizing aqueous ammonia sample solutions to assess analyte memory ret
Autor:
Ramon M. Barnes, Assad S. Al-Ammar
Publikováno v:
J. Anal. At. Spectrom.. 16:327-332
The common analyte internal standardization (CAIS) chemometric technique is extended to improve isotope ratio precision obtained by inductively coupled plasma-quadrupole mass spectrometry (ICP-QMS). A correction function for isotope ratio measurement
Publikováno v:
Spectrochimica Acta Part B: Atomic Spectroscopy. 55:1861-1867
A method was developed to improve the precision of inductively coupled plasma quadrupole mass spectrometry (ICP-QMS) for the determination of boron isotope ratios (11B/10B) in various environmental materials including seawater. This approach is based
Publikováno v:
Spectrochimica Acta Part B: Atomic Spectroscopy. 55:629-635
Injection of 10–20 ml/min of ammonia gas into an inductively coupled plasma-mass spectrometry (ICP-MS) spray chamber during boron determination eliminates the memory effect of a 1 μg/ml B solution within a 2-min washing time. Ammonia gas injection
Publikováno v:
Journal of Radioanalytical and Nuclear Chemistry. 244:267-272
Two sample treatment methods are evaluated to provide accurate boron determination at low concentrations in biological and botanical samples. The first approach is a hot 1M nitric acid extraction of boron from the sample. The second technique uses we
Autor:
Assad S. Al-Ammar, Ramon M. Barnes
Publikováno v:
Journal of Chemometrics. 15:49-67
A novel supervised classification algorithm, direct clustering in n-dimensional space (DCNS), was developed for difficult data sets where conventional methods of supervised clustering are expected to fail. The method is based, when applied on >3-dime
Publikováno v:
Spectrochimica Acta Part B: Atomic Spectroscopy. 54:1813-1820
The mechanism by which carbon matrix species cause non-spectroscopic matrix interference on boron (B) and beryllium (Be) during the determination of B in biological samples is investigated. The study indicates that, unlike other matrix species such a