Laser-excited atomic fluorescence flame spectrometry as an analytical method

1972 ◽  
Vol 44 (8) ◽  
pp. 1444-1451 ◽  
Author(s):  
L. M. Fraser ◽  
J. D. Winefordner
Keyword(s):  
Analytical Method ◽  
Atomic Fluorescence ◽  
Flame Spectrometry

scholarly journals Influence of Saturation Phenomena on Laser-Excited Atomic Fluorescence Flame Spectrometry

1973 ◽  
Vol 28 (2) ◽  
pp. 273-279
Author(s):  
J. Kühl ◽  
S. Neumann ◽  
M. Kriese
Keyword(s):  
Power Density ◽  
Laser Power ◽  
Atomic Emission ◽  
Equation Model ◽  
Laser Power Density ◽  
Atomic Level ◽  
Dye Laser ◽  
Atomic Fluorescence ◽  
Emission Flame ◽  
Flame Spectrometry

Using a simple rate equation model, the laser power density Ic necessary to reach 50% of the saturation limited population of the excited atomic level under typical flame conditions is calculated. For Na atoms aspirated into the flame a saturating power density for irradiation with a narrow dye laser line (bandwidth 0.033 Å) of Ic ~ 0.4 kW/cm2 was determined. With the aid of a dye laser with an appropriate laser power density, analytical curves for Na were measured yielding a detection limit of 0.2 ng/ml. This sensitivity is comparable with the best results obtained by atomic emission flame spectrometry.

A New Optical System for Flame Spectroscopy with Special Reference to Thermally Assisted Anti-Stokes Fluorescence Applications

1971 ◽  
Vol 25 (1) ◽  
pp. 57-60 ◽  
Author(s):  
P. Benetti ◽  
N. Omenetto ◽  
G. Rossi
Keyword(s):  
Detection Limits ◽  
Total Consumption ◽  
Atomic Fluorescence ◽  
Flame Emission ◽  
Analytical Importance ◽  
Primary Focus ◽  
Spherical Mirrors ◽  
Anti Stokes ◽  
Flame Spectrometry ◽  
Flame Position

A new optical setup for increasing the intensity of atomic fluorescence flame spectrometry is presented. The arrangement consists of two concave spherical mirrors and an elliposidal mirror whose primary focus is located at the flame position, and secondary at the entrance slit of the monochromator. Approximately 10 times gain in the measured intensities was obtained. The system is also useful for flame emission work, for which about five times gain was observed. With a low background flame such as the air–H2 for the N2−H2 diffusion flame and 400 µ slits, calcium can be detected at the level of 0.005 µg/ml. Moreover, the observed thermally assisted anti-Stokes fluorescence of In and Ga can be of analytical importance since the detection limits with a total consumption burner and the air-H2 flame were found to be 0.015 and 0.02 µg/ml, respectively. Detection limits in atomic fluorescence for Cr, Tl, In, and Fe are also presented.

scholarly journals Determination of methyl mercury and total mercury in sediment samples collected from canals in HoChiMinh city

2016 ◽  
Vol 19 (4) ◽  
pp. 123-136
Author(s):  
Hien Thai Hoang ◽  
Dong Van Nguyen
Keyword(s):  
Reference Material ◽  
Analytical Method ◽  
Methyl Mercury ◽  
Total Mercury ◽  
Inorganic Mercury ◽  
Absorption Spectrometry ◽  
Internal Reference ◽  
Atomic Fluorescence ◽  
Sediment Samples ◽  
Cold Vapour

In this study, the analysis of methyl mercury (MeHg) and total mercury (T-Hg) was studied using gas chromatographic separation/atomic fluorescence spectrometric detection and cold vapour atomic absorption spectrometry respectively. MeHg was extracted from sediment matrix using HNO3/KCl/CuSO4 into dichloromethane followed ethylation with NaB(C2H5)4 in hexane. Total mercury was digested using three different procedures: EPA 245.1, AOAC 971.21 and our proposed one. The reliability of the analytical method for MeHg was evaluated by the use of the certified reference material ERM CC-580. In addition, the analytical method for total merury was evaluated using a fresh water sediment as an internal reference material, spiked with inorganic mercury, methyl mercury and phenyl mercury. The method detection limits for MeHg and total mercury were 0.08 and 0.15 ng/g (as Hg), respectively. The established analytical methods were applied to analyse MeHg and total mercury in sediment samples collected from canals and rivers in Hochiminh City. The concentrations of methyl mercury and total mercury in sediment samples were 0.08–2.87 ng/g và 14 – 623 ng/g (as Hg, dw). [MeHg]/Σ[Hg] respectirely were in a range of 0.1–2.3 %, which was in good agreement with the published ratios in sediment samples. A good correlation between the concentration of MeHg with total mercury and total organic carbon contents in the studied sediment samples was found.

Measurement of microsamples in atomic emission and atomic fluorescence flame spectrometry

1972 ◽  
Vol 60 (1) ◽  
pp. 55-64 ◽  
Author(s):  
J. R. Sarbeck ◽  
P. A. St. John ◽  
J. D. Winefordner
Keyword(s):  
Atomic Emission ◽  
Atomic Fluorescence ◽  
Flame Spectrometry

Non-linear optical behavior in atomic fluorescence flame spectrometry

1973 ◽  
Vol 28 (8) ◽  
pp. 289-300 ◽  
Author(s):  
N. Omenetto ◽  
P. Benetti ◽  
L.P. Hart ◽  
J.D. Winefordner ◽  
C.Th.J. Alkemade
Keyword(s):  
Atomic Fluorescence ◽  
Non Linear ◽  
Linear Optical ◽  
Optical Behavior ◽  
Flame Spectrometry

Use of the hydrogen-entrained-air flame in atomic fluorescence flame spectrometry

1966 ◽  
Vol 38 (13) ◽  
pp. 1943-1945 ◽  
Author(s):  
David Wertz. Ellis ◽  
Donald R. Demers
Keyword(s):  
Atomic Fluorescence ◽  
Entrained Air ◽  
Flame Spectrometry

Double modulation atomic fluorescence flame spectrometry

1974 ◽  
Vol 46 (4) ◽  
pp. 601-602 ◽  
Author(s):  
W. K. Fowler ◽  
D. O. Knapp ◽  
J. D. Winefordner
Keyword(s):  
Atomic Fluorescence ◽  
Flame Spectrometry ◽  
Double Modulation
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