AI Article Synopsis
- A new electrochemical hydride generator has been created to detect arsenic (As) and antimony (Sb) using a tungsten wire as the cathode, which offers better durability and efficiency compared to traditional materials.
- The performance of this generator was thoroughly analyzed, revealing detection limits of 0.10 µg/L for As and 0.15 µg/L for Sb, with high precision for repeated measurements.
- This advanced hydride generator has been successfully used in testing tobacco samples for total levels of As and Sb, demonstrating its practical application in environmental analysis.
Article Abstract
A novel electrochemical hydride generator has been developed for the determination of As and Sb. This newly devised hydride generator is constructed from a flowing electrolytic cell, in which the tungsten wire is selected as cathode. Compared with some cathode material usually used in electrochemical hydride generator, the tungsten cathode is of better interference tolerance, corrosion-resistant and longer working time. The characteristics of the cathode material, hydride generating efficiency and interferences of concomitant have been studied in detail. The detection limits (3sigma) of As and Sb in sample solution were 0.10mugL(-1) and 0.15mugL(-1), the precisions for 11 replicate measurements of 20mugL(-1) As and Sb were 1.3% and 1.7%. The electrochemical hydride generator coupled with atomic fluorescence spectrometry has been applied to the determination of total As and Sb in tobacco samples.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.talanta.2005.07.041 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Ce[N(SiMe3)2]3(THF)3-Catalyzed Hydroboration of CO2, Esters and Epoxides with Pinacolborane: Selective Synthesis of Methanol in Multigram Scale.
Chemistry
January 2025
INDIAN INSTITUTE OF SCIENCE EDUCATION AND RESEARCH PUNE, CHEMISTRY, HOMI BHABA ROAD, PASHAN, PUNE, 411008, PUNE, INDIA.
In this work, we have reduced CO2 with HBpin to afford borylated methanol product selectively in ~99% yield using Ce[N(SiMe3)2]3(THF)3 as a catalyst. This led to multigram scale isolation of methanol obtained from CO2 reduction via the hydrolysis of borylated methanol, this establishes the potential of Ce[N(SiMe3)2]3(THF)3 as an efficient homogeneous catalyst for the bulk scale methanol synthesis. A practical application of this catalytic system was also shown by reducing CO2-containing motorbike exhaust efficiently and selectively.
View Article and Find Full Text PDFCO2 Reduction at a Borane-Modified Iron Complex: A Secondary Coordination Sphere Strategy.
Angew Chem Int Ed Engl
January 2025
Western University, Chemistry, 1151 Richmond Street, N6A3K7, London, CANADA.
This work addresses fundamental questions that deepen our understanding of secondary coordination sphere effects on carbon dioxide (CO2) reduction using derivatized hydride analogues of the type, [Cp*Fe(diphosphine)H] (Cp* = C5Me5-) - a well-studied family of organometallic complex - as models. More precisely, we describe the general reactivity of [(Cp*-BR2)Fe(diphosphine)H], which contains an intramolecularly positioned Lewis acid, and its cooperative reactivity with CO2. Control experiments underscore the critical nature of borane incorporation for CO2 to reduced products, a reaction that does not occur for unfunctionalized [Cp*Fe(diphosphine)H]).
View Article and Find Full Text PDFConstrained Nuclear-Electronic Orbital Transition State Theory Using Energy Surfaces with Nuclear Quantum Effects.
J Chem Theory Comput
January 2025
Theoretical Chemistry Institute and Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States.
Hydrogen-atom transfer is crucial in a myriad of chemical and biological processes, yet the accurate and efficient description of hydrogen-atom transfer reactions and kinetic isotope effects remains challenging due to significant quantum effects on hydrogenic motion, especially tunneling and zero-point energy. In this paper, we combine transition state theory (TST) with the recently developed constrained nuclear-electronic orbital (CNEO) theory to propose a new transition state theory denoted CNEO-TST. We use CNEO-TST with CNEO density functional theory (CNEO-DFT) to predict reaction rate constants for two prototypical gas-phase hydrogen-atom transfer reactions and their deuterated isotopologic reactions.
View Article and Find Full Text PDFMechanistic Studies on the Gold-Catalyzed Intramolecular Hydroalkylation of Ynamides to Indenes.
ACS Omega
December 2024
Laboratoire de Chimie Organique, Service de Chimie et PhysicoChimie Organiques, Université libre de Bruxelles (ULB), Avenue F. D. Roosevelt 50, CP160/06, Brussels 1050, Belgium.
An in-depth experimental and computational study to rationalize the mechanism underlying the gold-catalyzed intramolecular hydroalkylation of ynamides to indenes is reported. Evaluating the reactivity of a set of deuterated ynamides and gold complexes allowed to get valuable insights into the mechanism of this reaction, while DFT calculations allowed to determine a plausible reaction pathway for this unprecedented transformation. This pathway involves the activation of the ynamide followed by a [1,5]-hydride shift from the highly reactive, in situ generated keteniminium ion, and a subsequent cyclization before deprotonation followed by a final protodeauration.
View Article and Find Full Text PDFRuthenium-Hydride Complexes Facilitated Sustainable Synthesis of Isoxazolones via Acceptorless Dehydrogenative Annulation of Alcohols.
J Org Chem
January 2025
Centre for Organometallic Chemistry, School of Chemistry, Bharathidasan University, Tiruchirappalli 620 024, India.
A streamlined strategy for the one-pot synthesis of isoxazolone analogues has been developed through an acceptorless dehydrogenative annulation (ADA) pathway by employing new Ru(II) hydride complexes as effective catalysts. New Ru(II) complexes () tailored with N̂O chelating carbazolone benzhydrazone ligands were synthesized and their formation was confirmed using analytical and spectral techniques including FT-IR and NMR. The structural configuration of the complexes featuring an octahedral geometry around the Ru(II) ion was precisely determined by single-crystal X-ray diffraction analysis.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!