scholarly journals Determination of complex stabilities with 1,10-phenanthroline-5,6-dione as ligand for the complexation of several transition metallic cations using chemometrics methods

2014 ◽  
Vol 28 (3) ◽  
pp. 373 ◽  
Author(s):  
N. Samadi ◽  
M. Salamati
Keyword(s):  
Metallic Cations ◽  
Complex Stabilities

scholarly journals FIA automatic dilution system for the determination of metallic cations in waters by atomic absorption and flame emission spectrometry

1996 ◽  
Vol 18 (1) ◽  
pp. 17-21 ◽  
Author(s):  
Jorge M. P. J. Garrido ◽  
Rui A. S. Lapa ◽  
José L. F. C. Lima ◽  
Cristina Delerue-Matos ◽  
João L. M. Santos
Keyword(s):  
Atomic Absorption ◽  
Emission Spectrometry ◽  
Flame Emission ◽  
Metallic Cations

Determination of Oxidation and Metallic Cations Release Kinetics on Nickel Base Alloys in PWR: Description of the On-Line Measurement Techniques

2008 ◽  
Author(s):  
Antoine Proust ◽  
Michael Guillodo ◽  
Miche`le Pijolat ◽  
Krzysztof Wolski
Keyword(s):  
Water Chemistry ◽  
Oxidation Rate ◽  
Diffuse Reflectance ◽  
Metallic Cation ◽  
Primary Water ◽  
On Line ◽  
Metallic Cations ◽  
Nickel Base ◽  
Analytical Device

A common issue in Nuclear Power Plants (NPP) is the release of corrosion products from the steam generator tubes in primary circuit which gives rise, after their neutronic activation, to a residual activity very problematic during chemistry transients. The objectives of this work are not to solve directly this problem but rather to improve the understanding of this phenomenon by determining experimentally the kinetics of oxidation and metallic cations release of nickel base alloys. These results will contribute to progress in the building of a physical mechanism. The specificity of the test facility is (i) the on-line measurements of cation release rate by a highly sensitive analytical device and (ii) the in-situ measurement of oxidation rate by Diffuse Reflectance Spectroscopy (DRS). The primary water chemistry is controlled by means of a circulating micro-loop in titanium to avoid any interference with the test samples. A specific test vena is connected between the titanium micro-loop and the analytical device for on-line measurements. Metallic cation release from SG tube-samples is deduced from the measurement of nickel and iron concentrations in upstream the test vena by use of differential polarography and ICP-AES techniques. The precision on the determination of Ni and Fe concentrations is assumed to be a few tens of ppt. Oxidation or corrosion measurements are performed off-line by optical diffuse reflectance measurements specifically developed in this framework. The corrosion sample is mounted in a High Temperature and Pressure (HT-HP) spectroscopic flow-through cell connected to the test vena and fed with the primary chemistry from the titanium micro-loop. Analysis of reflection spectra provides the thickness of oxide layer. A set of parameters such as (i) temperature, (ii) hydrogen content and (iii) metallurgical surface state in nominal primary chemistry for test durations of 1500–2000 hours is planned to be investigated in the frame of metallic cation release and oxidation kinetics measurements of Ni base alloys. The aim of this paper is focused on the presentation of the online technique specifically developed in the French Technical Centre of AREVA NP to determine the metallic cation release and oxidation kinetic of Ni base alloys in primary water chemistry. First results of cation release and oxidation rate are given for shorter duration test.

Determination of complex stabilities with nearly insoluble host molecules. Part I. Spectrophotometric detection

1994 ◽  
Vol 7 (9) ◽  
pp. 479-484 ◽  
Author(s):  
Hans-J�rgen Buschmann ◽  
Ernst Cleve ◽  
Ulrike Denter ◽  
Eckhard Schollmeyer
Keyword(s):  
Spectrophotometric Detection ◽  
Host Molecules ◽  
Complex Stabilities

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Distance to SN 1987A and the LMC

1999 ◽  
Vol 190 ◽  
pp. 549-554
Author(s):  
Nino Panagia
Keyword(s):  
Angular Size ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Light Curves ◽  
Distance Modulus ◽  
Absolute Size ◽  
Sn 1987A

Using the new reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al. (1991) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ringRabs= (6.23 ± 0.08) x 1017cm and an angular sizeR″ = 808 ± 17 mas, which give a distance to the supernovad(SN1987A) = 51.4 ± 1.2 kpc and a distance modulusm–M(SN1987A) = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to bed(LMC) = 52.0±1.3 kpc, which corresponds to a distance modulus ofm–M(LMC) = 18.58±0.05.

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