Interactions between sulfide minerals and alkylxanthate ions 3. A vibration spectroscopic, calorimetric and atomic absorption spectrophotometric study of the interaction between galena and ethylxanthate ions in aqueous solution

1991 ◽  
Vol 58 (1-2) ◽  
pp. 161-181 ◽  
Author(s):  
Per Persson ◽  
Ingmar Persson
Keyword(s):  
Aqueous Solution ◽  
Atomic Absorption ◽  
Spectrophotometric Study ◽  
Sulfide Minerals

N-ACYL SUBSTITUTED PHENYLHYDROXYLAMINES: THE EFFECT OF RADICAL CHANGE ON ANALYTICAL BEHAVIOR

1957 ◽  
Vol 35 (12) ◽  
pp. 1454-1460 ◽  
Author(s):  
C. A. Armour ◽  
D. E. Ryan
Keyword(s):  
Aqueous Solution ◽  
Stability Constant ◽  
Radical Change ◽  
Spectrophotometric Study ◽  
Iron Complex ◽  
Membered Ring ◽  
Analytical Reagents ◽  
Colorimetric Reagent ◽  
Analytical Behavior

The synthesis of a number of N-acyl substituted phenylhydroxylamines is outlined and the effect of the change in the nature of the acyl group on their usefulness as analytical reagents is described. Stability constant measurements in alcohol show an increase in stability with an increase in basicity of reagent regardless of the nature of the attached group; their ability to precipitate complexes from aqueous solution, however, is markedly dependent on the nature of the attached radical. A spectrophotometric study shows the existence of both a 1:1 and a 1:3 iron complex. A more sensitive colorimetric reagent results with an unsaturated five-membered ring as the attached grouping.

Atomic absorption background of Ba in EXAFS analysis of BaFe12O19nanoparticles

2011 ◽  
Vol 18 (4) ◽  
pp. 557-563 ◽  
Author(s):  
Jana Padežnik Gomilšek ◽  
Alojz Kodre ◽  
Iztok Arčon ◽  
Simone de Panfilis ◽  
Darko Makovec
Keyword(s):  
Aqueous Solution ◽  
Absorption Spectrum ◽  
Atomic Absorption ◽  
Energy Region ◽  
Structural Parameters ◽  
Simple Analytical Model ◽  
Absorption Signal ◽  
X Ray ◽  
Exafs Analysis ◽  
Atomic Absorption Spectra

The approximate barium X-ray atomic absorption in the energy region ofL-edges is reconstructed from the absorption spectrum of an aqueous solution of BaCl2. The result is corroborated by comparison with pure atomic absorption spectra of neighbour elements Xe and Cs. The application of the atomic absorption signal as a proper EXAFS background is demonstrated and discussed in the analysis of Ba hexaferrite nanoparticles with a very weak structural signal. The essential gain is found in the decrease of uncertainty intervals of structural parameters and their correlations. A simple analytical model of the absorption background for the practical EXAFS analysis is demonstrated.

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