Search results for "trace analysis"
showing 10 items of 26 documents
Vapor-phase introduction of alkyltin compounds in atomic absorption spectrophotometry
1990
Abstract Different systems for the introduction of alkyltin compounds in atomic absorption spectrophotometry using the vapor-phase introduction approach have been compared. Samples and standards were introduced in both quartz cell and flame atomizer using a vertical and a horizontal reactor. The better sensitivity was obtained with the quartz cell and the horizontal reactor.
Selective and sensitive determination of copper by stripping voltammetry after medium exchange in a flow-through cell
1990
La methode permet de doser le cuivre a des teneurs de 5 a 20 μg/l en presence d'autres elements
Release Studies of Atomic Technetium
1991
Application of a laser ion source (LIS) is a promising new technique for trace analysis with high efficiency and selectivity. One of the problems which can limit its efficiency attained in practice is the adsorption of sample atoms on the hot walls of the LIS cavity. We have studied the release of atomic technetium from different wall materials at temperatures up to 2500 K. For these investigations resonance ionization of technetium atoms applying a copper vapour pumped dye laser system and γ-spectrometry of 6-h 99mTc have been used. Theoretical calculations of the heat of desorption for technetium on different wall materials are presented and compared with experimental data. Though the res…
Resonance ionization mass spectroscopy for nuclear research and trace analysis
1987
Resonance ionization mass spectroscopy (RIMS) has been applied, firstly, to a study of the nuclear properties of short-lived Au isotopes at the on-line isotope separator ISOLDE at CERN and, secondly, to a trace-analysis experiment of Pu.
New Developments in the Production and Research of Actinide Elements
2022
Atoms 10(2), 61 (2022). doi:10.3390/atoms10020061
Counting IndividualCa41Atoms with a Magneto-Optical Trap
2004
Atom trap trace analysis, a novel method based upon laser trapping and cooling, is used to count individual atoms of $^{41}\mathrm{Ca}$ present in biomedical samples with isotopic abundance levels between ${10}^{\ensuremath{-}8}$ and ${10}^{\ensuremath{-}10}$. The method is calibrated against resonance ionization mass spectrometry, demonstrating good agreement between the two methods. The present system has a counting efficiency of $2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}7}$. Within 1 h of observation time, its $3\mathrm{\text{\ensuremath{-}}}\ensuremath{\sigma}$ detection limit on the isotopic abundance of $^{41}\mathrm{Ca}$ reaches $4.5\ifmmode\times\else\texttimes\fi{}{10…
Inverse Polarography and Voltammetry: New Methods for Trace Analysis
1962
Inverse polarographic and voltammetric methods are surveyed. The electrochemical determination procedure is carried out by current reversal after electrolytic concentration on a working electrode. Analyses in the nanogram (ng) region (10−9 g.) are possible because the sensitivity is increased by a factor of 100 to 1000 in comparison with the usual polarographic and voltammetric methods. These methods are, therefore, of particular interestin trace analysis.
Trace Analysis of the Radionuclides90Sr and89Sr in Environmental Samples I: Laser Mass Spectrometry
1995
A Universal and Sensitive Method for Gas Chromatographic Determination of Volatile Substrates and Metabolites
1978
The concentration of solutes from aqueous solutions in the μl range is still a problem in gas chromatographic trace analysis (e.g. J.S. Fritz, Acc. Chem. Res. 10, 67, 1977).
Pesticides and Herbicides: Residue Determination
2016
Pesticide and herbicide residue determination in food is becoming an especially imperative and challenging issue. Commonly, it involves the simultaneous trace analysis of hundreds of compounds belonging to many chemical classes. This article provides a review of the current status of the routine methods in the monitoring and control of these residues and discusses the analytic problems arising at each stage of the procedure. The role of mass spectrometry in screening, identification, and confirmation of target and nontarget pesticides is highlighted. Consideration is given to new developments and future trends.