Determination of the stratospheric organic chlorine budget in the spring arctic vortex from MIPAS B limb emission spectra and air sampling experiments

1995 ◽  
Vol 100 (D7) ◽  
pp. 13979 ◽  
Author(s):  
T. von Clarmann ◽  
A. Linden ◽  
H. Oelhaf ◽  
H. Fischer ◽  
F. Friedl-Vallon ◽  
...  
Keyword(s):  
Emission Spectra ◽  
Air Sampling ◽  
Organic Chlorine

scholarly journals A New Sensitive Fluorirnetric Method for the Determination of Heptaminol and Mexiletine in Pharmaceuticals

2002 ◽  
Vol 70 (1) ◽  
pp. 57-65 ◽  
Author(s):  
EI-Adl Sobhy M.
Keyword(s):  
Sodium Salt ◽  
Emission Spectra ◽  
Reaction Conditions ◽  
Pharmaceutical Excipients ◽  
Reference Methods ◽  
Acid Sodium Salt ◽  
Spectrofluorimetric Method

An accurate and very sensitive spectrofluorimetric method is proposed for the estimation of heptaminol (HP) and mexiletine (MX) in their pure forms and in pharlnaceutical formulations. The method is based on the reaction of these drugs with the strong fluorigenic reagent [9,1O-Dimethoxy-2-anthracenesulfonic acid sodium salt (DAS)] at pH (2.5). The formed complexes are extracted into chloroform and measured spectrofluori~netrically. The maximum wavelengths of excitation and emission spectra of heptaminol complex are 381 and 441 m, respectively. While those of mexiletine complex are 385 and 450 nrn, respectively. Heptaminol can be determined in the concentration range of 0.016-0.144 µg ml−1 and that of mexiletine in the range of 0.024-0.176 µg ml−1, when extracted from the solutions into chloroform. Different parameters affecting the reaction conditions were thoroughly studied. No interference was observed in the presence of common pharmaceutical excipients. The proposed method has been successfully applied to the analysis of commercial pharmaceutical fonnulations and the results have been statistically compared with those obtained by the reference methods.

Determination of the temperatures of hot nuclei from “first chance” emission spectra

1989 ◽  
Vol 217 (4) ◽  
pp. 406-410 ◽  
Author(s):  
M. Gonin ◽  
L. Cooke ◽  
K. Hagel ◽  
Y. Lou ◽  
J.B. Natowitz ◽  
...  
Keyword(s):  
Emission Spectra ◽  
Hot Nuclei

scholarly journals Concentration Quantification of Oil Samples by Three-Dimensional Concentration-Emission Matrix (CEM) Spectroscopy

2019 ◽  
Vol 10 (1) ◽  
pp. 315
Author(s):  
Yunan Chen ◽  
Ruifang Yang ◽  
Nanjing Zhao ◽  
Wei Zhu ◽  
Yao Huang ◽  
...  
Keyword(s):  
Oil Spill ◽  
Three Dimensional ◽  
Emission Spectra ◽  
Quantitative Detection ◽  
Excitation Wavelength ◽  
Detection Technology ◽  
Shift Behavior ◽  
Relative Errors ◽  
Matrix Similarity

Developing fast and accurate fluorescence detection technology of oil spill is significant for quantitative analysis in unexpected oil spill events. As the oil sample concentration increases, the fluorescence spectrum produces red-shift behavior, which seriously affects the quantitative detection of concentration. In this work, a three-dimensional concentration-emission matrix (CEM) was constructed by using a series of emission spectra with different levels of concentration at the excitation wavelength of 266 nm. The database is the interpolated CEM of six samples using bicubic interpolation in the concentration dimension. With matrix similarity matching, the database was used to achieve quantification of the concentration of oil samples. The recovery rates of prediction for test samples and weathering samples of six oil samples were between 86.8% and 116.11%, with relative errors of predictions ranging from 2.09% to 15.2%. The results show that this method can provide accurate quantitative determination of the concentration of different oil samples.

Determination of total primary zero loss intensities in measured electron emission spectra of bare and oxidised metals

2000 ◽  
Vol 161 (1-2) ◽  
pp. 139-148 ◽  
Author(s):  
L.P.H. Jeurgens ◽  
W.G. Sloof ◽  
C.G. Borsboom ◽  
F.D. Tichelaar ◽  
E.J. Mittemeijer
Keyword(s):  
Electron Emission ◽  
Emission Spectra

Ambient Air Sampling for Tritium-Determination of Breakthrough Volumes and Collection Efficiencies for Silica Gel Adsorbent

1997 ◽  
Vol 72 (3) ◽  
pp. 397-407 ◽  
Author(s):  
Gregory W. Patton ◽  
Andrew T. Cooper ◽  
Michael R. Tinker
Keyword(s):  
Silica Gel ◽  
Air Sampling ◽  
Ambient Air
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