Sample nebulization for minimization of transition metal interferences with selenium hydride generation ICP-AES

Hou

2010

A novel system which significantly enhances copper hydride generation efficiency was used for the determination of trace copper by coupling a flow injection system to a graphite furnace for in-situ collection of the analyte and subsequent AAS detection. A single device integrated the functions of hydride generator and gas liquid separator.Solutions of the sample, acidified to 1 % formic acid, and tetrahydroborate reductant were merged to yield a thin film wetting a reaction surface from which product vapor was efficiently liberated and transported to the heated furnace. Optimum operating conditions provided for a generation / transport / collection efficiency of 8-12%. Interferences from common transition and noble metals were effectively eliminated. A limit of detection of 60 pg ml -1 was obtained based on processing a 5 mL sample volume with a precision of better than 4% (RSD) at 1 ng mL -1 . The methodology was successfully applied to the determination of Cu in several NRCC natural w ater and biological tissue Certified Reference Materials.3

Section: Introductionmentioning

confidence: 99%

Thin film hydride generation: determination of ultra-trace copper by flow injection in situ hydride trapping graphite furnace AAS

Zheng

Hou

2010

“…This suggests the presence of a Rh species chemisorbed onto the surface. This may be unreacted Rh(III) retained by Pt 650 (40) 60 (4) 160 (7) 50 (2) 23 (1) 31 (2) 197 Au 5200 (180) 11 000 (130) 11 000 (130) 400 (20) 1800 (90) 1700 (80) 59 Co 7300 (280) 1500 (40.5) 2700 (70) 500 (8) 300 (10) 540 (20) 60 Ni 1400 (90) 500 (10) 700 (5) 250 (5) 170 (3) 260 (6) (40) 450 (20) 410 (20) 150 (7) 100 (5) 140 (8) (14 380) 300 700 (14 130) 287 500 (12 960) 308 750 (11 540) 239 530 ( …”

Section: Partmentioning

confidence: 99%

Insights into the mechanism of chemical vapor generation of transition and noble metals

Feng

Lam

et al. 2005

Access and use of this website and the material on it are subject to the Terms and Conditions set forth at NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=8898182&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=8898182&lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1039/b417172aJournal of Analytical Atomic Spectrometry, 20, 4, pp. 255-265, 2005 Insights into the mechanism of chemical vapor generation of transition and noble metals The mechanisms of chemical vapor generation (CVG) of transition and noble metals by reaction with tetrahydroborate(III) have been investigated in an effort to reconcile fundamental properties of compounds containing metal-hydride bonds with the experimental evidence collected in the present work and in the recent analytical literature on CVG. Silver, gold and rhodium were investigated in detail. Various materials constituting the wetted surfaces of the reaction apparatus (Ryton, glass, silanized glass) were examined for their effect on the overall process, as was the presence of surface-active agents (Triton X-100 TM , antifoam B). Two types of reactions contribute to the formation of volatile species. The first (primary reaction) occurs through homogeneous liquid phase reactions between aqueous analyte complexes (ML n ) and hydroboron species (BH 4 À and its hydrolysis products). The second (secondary reaction) is a surface mediated reaction between reaction intermediates, mostly formed in the primary reaction and chemisorbed by active sites on surfaces, and hydroboron species. The participation of active surface sites generally improves the efficiency of CVG compared with use of an inert surface, but this feature cannot always be usefully employed in analytical applications due to slow reaction kinetics producing memory effects. Reaction int...

“…Rapid separation of the analyte from the aqueous phase is required to achieve optimum signal response; a longer reaction time or residence time in the aqueous phase provides more opportunity for additional reaction with the reductant, possibly resulting in formation of precipitates or other potential hydrolysis or reoxidation reactions, supporting ours' and others' earlier conclusions on the effect of this variable. 1,6,13,21 Enhanced mixing time also results in the appearance of black deposits on the inside of the reaction tube. If conventional batch approaches to vapor generation are attempted with these elements, no response is achieved.…”

Section: Effect Of Mixing Timementioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] Sanz-Medel et al 8 reported on the generation of a volatile species of Cd following reduction of Cd(II) with sodium tetrahydroborate(III) in aqueous solutions containing vesicles of didodecyldimethylammonium bromide. Sturgeon et al [1][2][3][4][5][6][7]20 published a series of papers on the vapor generation of Cu, Au, Ag, Zn, Rh, Pd, In, Ti, Ir, Pt, Mn, Hg, Tl, Pb and Cd with sodium tetrahydroborate(III). Pohl and Zyrnicki [10][11][12] presented evidence for enhanced sample introduction efficiencies for Co, Cr, Fe and Ni, achieved following reaction of solutions of these metals with tetrahydroborate(III) when using a Meinhard nebuliser.…”

Section: Introductionmentioning

confidence: 99%

Chemical vapor generation characteristics of transition and noble metals reacting with tetrahydroborate(iii)

Feng

Lam

2003

Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Chemical vapor generation characteristics of transition and noble metals reacting with tetrahydroborate (III)Feng NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=8900865&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=8900865&lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1039/b307675jJournal of Analytical Atomic Spectrometry, 18, 12, pp. 1435Spectrometry, 18, 12, pp. -1442Spectrometry, 18, 12, pp. , 2003 Chemical vapor generation characteristics of transition and noble metals reacting with tetrahydroborate(III){ The vapor generation characteristics of several transition and noble metals arising from reduction of their aquo-ions by tetrahydroborate(III) are presented. A modified parallel path Burgener Teflon nebulizer interfaced to an ICP-MS for detection was used to examine the effects of experimental variables. The influence of both hydrochloric and nitric acid as well as the nature of the surface exposed to the nascent species is of paramount importance to the overall efficiency of the generation process. Both glass and Ryton double pass spray chambers were examined, the latter providing superior performance with respect to sensitivity as well as memory effects. Data were presented for the generation of vapor phase species of Rh, Pd, Au and Cu that can be collected in a weakly acidic medium for subsequent release as a gaseous product.