Laser-excited atomic fluorescence spectrometry

Yuzefovsky et al. [241] used Cis resin to preconcentrate cobalt from seawater prior to determination at the ppt level by laser-excited atomic fluorescence spectrometry with graphite electrothermal atomiser. 

Laser-excited atomic fluorescence spectrometry has been used to determine down to 1 ng/1 of lead in seawater [359]. 

Cobalt Co(III) adsorbed on C18 bonded silica Laser excited atomic fluorescence spectrometry - [241]... 

F. R. Prell, Jr.. J. T. McCaffrey. M. D. Seltzer, and R. G. Michel. "Instrumentation for Zeeman Electrothermal Atomizer Laser Excited Atomic Fluorescence Spectrometry,"... 

Laser-excited atomic fluorescence spectrometry allowed for the determination of Pb in Vostok deep ice cores with a precision of 20% (63, 64). Values of 2-40 pg g were measured for ages spanning the 155,000-26,000 years BP. The technique permitted sample volumes as low as 20 pi to be dealt with without any preliminary treatment, thus greatly facilitating contamination control. 

C. F. Boutron, M. A. Bolshov, V. G. Koloshnikov, C. C. Patterson, N. 1. Barkov, Direct determination of lead in Vostok Antarctic ancient ice by laser excited atomic fluorescence spectrometry. Atm. Environ., 24A (1990), 1797-1800. 

Laser Excited Atomic Fluorescence Spectrometry (LEAFS) (40, 41, 46-48), Thermal Ionisation Mass Spectrometry (TIMS) (6, 42, 43, 45, 49-53), Electrothermal Atomization Atomic Absorption Spectrometry (ETA-AAS) (24, 28, 54, 55), Differential Pulse Anodic Stripping Voltammetry (DPASV) (27, 49, 56, 57),... 

Laser Excited Atomic Fluorescence Spectrometry (LEAFS) Bi, Cd, Pb (40, 41, 46-48)... 

Laser-excited atomic fluorescence spectrometry is capable of extremely low detection limits, particularly when combined with electrothermal atomization. Detection limits in the femtogram (10 g) to attogram (10 g) range have been shown for many elements. Commercial instrumentation has not been developed for laser-based AFS, probably because of its expense and the nonroutine nature of high-powered lasers. Atomic fluorescence has the disadvantage of being a singleelement method unless tunable lasers with their inherent complexities are used. 

Bolshov M. A., Rudniev S. N., Rudnieva A. A., Boutron C. F. and Hong S. (1997) Determination of heavy metals in polar snow and ice by laser excited atomic fluorescence spectrometry with electrothermal atomization in a graphite cup, Spedrochim Acta, Part B 52 1535-1544. 

Smith B. W., Quentmeier A., Bolshov M. and Niemax K. (1999) Measurement of uranium isotope ratios in solid samples using laser ablation and diode laser-excited atomic fluorescence spectrometry, Spectrochim Acta, Part B 54 943—958. 

The application of microtron photon activation analysis with radiochemical separation in environmental and biological samples was described by Randa et al. (2001), and both flame and plasma emission spectroscopic methods are also widely used. A more recently developed technique is that of laser-excited atomic fluorescence spectrometry (LEAFS) (Cheam et al. 1998). 

Dougherty, J.P., Preli, F.R., and Michel, R.G. (1989) Laser-excited atomic-fluorescence spectrometry in an electrothermal atomizer with zeeman background correction. Talanta, 36, 151-159. 

Graphite Furnace Laser-excited Atomic Fluorescence Spectrometry (GF-LEAFS)... 

TABLE IV. Limiting Noises and Detection Limits in Laser-Excited Atomic Fluorescence Spectrometry using the 296.7/373.5 nm Transition of Iron... 

Butcher DJ, Dougherty JP, Preli FR, et al. (1988) Laser excited atomic fluorescence spectrometry in flames, plasmas and electrothermal atomizers. Journal of Analytical Spectrometry 3 1059-1078. 

Radiation sources As in AA, line sources are typically used, although high-intensity sources are much more critical in AF. Boosted HCLs and EDLs have been employed. However, tunable lasers certainly provide the optimal sensitivity, i.e., laser excited atomic fluorescence spectrometry. 

Principles and Characteristics The analytical capabilities of the conventional fluorescence (CF) technique (c/r. Chp. 1.4.2) are enhanced by the use of lasers as excitation sources. These allow precise activation of fluorophores with finely tuned laser-induced emission. The laser provides a very selective means of populating excited states and the study of the spectra of radiation emitted as these states decay is generally known as laser-induced fluorescence (LIF, either atomic or molecular fluorescence) [105] or laser-excited atomic fluorescence spectrometry (LEAFS). In LIF an absorption spectrum is obtained by measuring the excitation spectrum for creating fluorescing excited state... 

LEAFS laser-excited atomic fluorescence spectrometry... 

With advanced measurement techniques, the results of the calculations could be readily verified, as performed with laser-excited atomic fluorescence spectrometry in the case of atom densities (Fig. 128) [582] and with laser-scattering experiments for the determination of gas and electron temperatures as well as electron number densities [583, 584]. 

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