A Description of the Kinetics and Mechanisms which Control the Release of Hlw Elements from Synroc

1990 ◽  
Vol 212 ◽  
Author(s):  
K. L. Smith ◽  
K. P. Hart ◽  
G. R. Lumpkin ◽  
P. McGlinn ◽  
P. Lam ◽  
...  
Keyword(s):  
Emission Spectroscopy ◽  
Optical Emission Spectroscopy ◽  
Optical Emission ◽  
Effect Of Temperature ◽  
Secondary Phases ◽  
Surface Layers ◽  
Before And After ◽  
Bicarbonate Solutions ◽  
Icp Mass Spectrometry ◽  
Kinetics Of

ABSTRACTLeaching tests were carried out on well-characterised Synroc C specimens containing 10 wt% simulated HLW. The effect of temperature and leachant composition on the mechanisms and kinetics of leaching were investigated by leaching Synroc specimens in deionised water at 70°C and 150°C, and in silicate and bicarbonate solutions at 70°C. SEM and TEM were used before and after leaching to characterise the primary and secondary phases in and on the Synroc samples, and to describe the morphological and chemical changes which occurred. Leachants were analysed using ICP/optical emission spectroscopy and ICP/mass spectrometry.Titaniferous surface layers were observed on the surface after exposure to leachants. Analysis of the leaching data has established that these surface layers can reduce the release of HLW elements from Synroc and that variations in temperature and leachant composition can hinder or promote the formation of secondary phases.

scholarly journals Профильный анализ пленок ферритов-гранатов методом оптической эмиссионной спектроскопии тлеющего разряда

2021 ◽  
Vol 91 (2) ◽  
pp. 352
Author(s):  
А.А. Федоренко ◽  
В.Н. Бержанский ◽  
А.В. Каравайников ◽  
А.Н. Шапошников ◽  
А.Р. Прокопов
Keyword(s):  
Glow Discharge ◽  
Elemental Composition ◽  
Emission Spectroscopy ◽  
Optical Emission Spectroscopy ◽  
Profile Analysis ◽  
Optical Emission ◽  
Transition Layers ◽  
Ferrite Garnet ◽  
Before And After

Annotation.The paper presents the results of experiments on the application of the method of optical emission spectroscopy of a glow discharge for the profile analysis of vacuum-deposited single and two-layer films of multicomponent garnet ferrites of various compositions before and after crystallization annealing. The presence of internal and external transition layers was revealed, and the modification of their elemental composition during crystallization, as well as the different sequence of synthesis of individual components in ferrite-garnet heterostructures, was investigated.

Selective Grafting of Amine Groups on Polyethylene by Means of Modulated RF NH3 Plasmas

1998 ◽  
Vol 544 ◽  
Author(s):  
M. Creatore ◽  
G. Cicala ◽  
P. Favia ◽  
R. Lamendola ◽  
R. d'Agostno
Keyword(s):  
Electron Spectroscopy ◽  
Emission Spectroscopy ◽  
Optical Emission Spectroscopy ◽  
Surface Composition ◽  
Optical Emission ◽  
Active Species ◽  
Time Resolved ◽  
Glow Discharges ◽  
Before And After ◽  
Amine Groups

AbstractPlasma treatments in power modulated NH3 RF glow discharges have been performed for modifying the surface of polyethylene (PE). Time Resolved Optical Emission Spectroscopy (TR-OES) has been utilized for monitoring the emission of active species during the modulation period of the discharge, Electron Spectroscopy for Chemical Analysis (ESCA) has been used for studying the surface composition of PE before and after the derivatization of plasmagrafted -NH2 groups. We present our preliminary results here, which show how modulated NH3 plasmas can effectively improve the grafting selectivity of -NH2 respect to all other N-containing groups.

Electron microscope study of Synroc before and after exposure to aqueous solutions

1991 ◽  
Vol 6 (10) ◽  
pp. 2218-2233 ◽  
Author(s):  
Gregory R. Lumpkin ◽  
Katherine L. Smith ◽  
Mark G. Blackford
Keyword(s):  
Effect Of Temperature ◽  
Secondary Phases ◽  
Solution Composition ◽  
Fine Grained ◽  
Major Mechanism ◽  
Icp Ms ◽  
Before And After ◽  
Congruent Dissolution ◽  
Durability Testing ◽  
Bicarbonate Solutions

A well-characterized Synroc was subjected to durability tests in de-ionized water at 70 °C and 150 °C, and silicate and bicarbonate solutions at 70 °C, to study the effect of temperature and solution composition on the mechanisms of aqueous alteration. SEM and TEM were used before and after durability experiments to characterize the primary and secondary phases in and on the Synroc samples, and to describe changes in morphology and chemistry. Leachant compositions after durability testing were analyzed using ICP/OES and ICP/MS and have been reported elsewhere.8 After durability testing, titaniferous surface layers were observed primarily on perovskite, the most soluble Synroc phase. Electron microscopy demonstrates that the surface layer formed at 70 °C is an amorphous Ti–O film and is fine grained anatase at 150 °C. Congruent dissolution is the major mechanism of perovskite alteration. However, at 150 °C, selective loss of Ca and Sr may occur locally. A number of additional secondary phases were identified, including Al–oxide/hydroxide, Fe–oxide, REE-bearing Ti–oxides, and several silicate phases. The abundance and composition of the secondary phases are related to solution composition and temperature.

Inductively coupled plasma optical emission spectroscopy as a tool for evaluating lateral flow assays

2021 ◽  
Author(s):  
Jenna M. DeSousa ◽  
Micaella Z. Jorge ◽  
Hayley B. Lindsay ◽  
Frederick R. Haselton ◽  
David W. Wright ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Emission Spectroscopy ◽  
Optical Emission Spectroscopy ◽  
Optical Emission ◽  
Lateral Flow ◽  
Gold Content ◽  
Icp Oes ◽  
Inductively Coupled ◽  
Lateral Flow Assays ◽  
Plasma Optical Emission Spectroscopy

This work demonstrates the first use of ICP-OES to quantitatively analyze gold content on lateral flow assays.

Seasoning Optimization by Using Optical Emission Spectroscopy

2020 ◽  
Author(s):  
Masahiro Shiga ◽  
Haruki Omine ◽  
Masaki Kitsunezuka ◽  
Hironori Moki ◽  
Yuki Kataoka ◽  
...  
Keyword(s):  
Emission Spectroscopy ◽  
Optical Emission Spectroscopy ◽  
Optical Emission
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