scholarly journals Characterization of Polyhalogenated 4-Methylphenol Dimers (Br/Cl-Predioxins) Formed during Aqueous Chlorination of 4-Methylphenol Solution in the Presence of Bromide Ion

2008 ◽  
Vol 54 (4) ◽  
pp. 423-431 ◽  
Author(s):  
Sukeo Onodera ◽  
Toshinari Takahashi ◽  
Shinya Takemoto ◽  
Tsunehiro Oh-i
Keyword(s):  
Bromide Ion

scholarly journals Radioisotopic Tracer Technique for Characterization of Nuclear and Non-Nuclear Grade Ion Exchange Resins Tulsion A-23 and Indion-810

2013 ◽  
Vol 11 ◽  
pp. 1-5
Author(s):  
Pravin U. Singare
Keyword(s):  
Ion Exchange ◽  
Reaction Rate ◽  
Nuclear Grade ◽  
Ion Exchange Resins ◽  
Specific Reaction Rate ◽  
Experimental Conditions ◽  
Specific Reaction ◽  
Bromide Ion ◽  
Exchange Resins

In the present paper 82Br radioactive tracer isotopes was used for characterization of nuclear and non-nuclear grade ion exchange resins Tulsion A-23 and Indion-810 respectively. The bromide ion-isotopic exchange reactions were performed by equilibrating 1.000 g of conditioned resins in bromide form with labeled bromide ion solution of different concentrations ranging from 0.001 M to 0.004 M, in the temperature range of 30.0 °C to 45.0 °C. The resins were characterized by comparing the values of specific reaction rate (min-1), amount of bromide ion exchanged (mmol) and percentage of bromide ions exchanged under identical experimental conditions. It was observed that the above values decrease with rise in temperature and increases with increase in concentration of labeled bromide ion solution. From the experimental values of specific reaction rate, amount and percentage of bromide ions exchanged, it was observed that Tulsion A-23 resins are superior to Indion-810 resins under identical experimental conditions.

scholarly journals Radiotracer Technique in Study of Strongly Basic Anion Exchange Resins Dowex-SBR LC and Indion-454

2013 ◽  
Vol 18 ◽  
pp. 37-49
Author(s):  
P.U. Singare
Keyword(s):  
Ion Exchange ◽  
Exchange Reaction ◽  
Anion Exchange ◽  
Isotopic Exchange ◽  
Ion Exchange Resins ◽  
Anion Exchange Resins ◽  
Isotopic Exchange Reaction ◽  
Bromide Ion ◽  
Exchange Resins

The present paper demonstrates application of isotopic tracer technique in characterization of anion exchange resins Dowex-SBR LC and Indion-454 for which 131I and 82Br radio isotopes were used. The characterization was made based on iodide and bromide ion-isotopic exchange reaction kinetic data obtained for the two resins. It was observed that during iodide ion-isotopic exchange reaction performed at 35.0 °C, 1.000 g of ion exchange resins and 0.002 mol/L labeled iodide ion solution, the values of specific reaction rate (min-1), amount of ion exchanged (mmol), initial rate of ion exchange (mmol/min) and log Kd were 0.379, 0.426, 0.161 and 16.2 respectively for Dowex-SBR LC resin, which was higher than the respective values of 0.156, 0.243, 0.038 and 13.4 as that obtained by using Indion-454 resins. The identical trend was observed for the two resins during bromide ion-isotopic exchange reaction. The results of present investigation also indicate that during the two ion-isotopic exchange reactions, for both the resins, there exists a strong positive linear correlation between amount of ions exchanged and concentration of ionic solution; and strong negative correlation between amount of ions exchanged and temperature of exchanging medium. Based on overall results it appears that under identical experimental conditions, as compared to Indion-454 resins, Dowex-SBR LC resins show superior performance. It is expected here that the present technique can be extended further for characterization of different ion exchange resins which will further help in the selection of those reins for the specific industrial application

Synthesis and Characterization of GdO+ Nanosheets Doped with Tm

2014 ◽  
Vol 1058 ◽  
pp. 40-43
Author(s):  
Yan Yan Zhang ◽  
Shi Liang Sun ◽  
Guo Liang Zhou ◽  
Dan Yu Jiang ◽  
Tao Feng ◽  
...  
Keyword(s):  
Rare Earth ◽  
Earth Metal ◽  
Synthesis And Characterization ◽  
Solid State Method ◽  
Toluene Sulfonate ◽  
Bromide Ion ◽  
Formamide Solution ◽  
State Method ◽  
Sodium Solution

Tm doped GdOBr compounds were successfully synthesized through solid-state method. Then bromide ion in the as-synthesized compounds Gd0.97Tm0.03OBr was exchanged by P-toluene sulfonate ion in P-toluene sulfonate sodium solution. A sol-solution was obtained after the ultrasound treatment of intercalating sample in formamide solution. In addition, many rare-earth metal elements can launch visible light when excited. The emissions of Tm3+ at 478nm originated from the transition of Tm3+(1G4→3H6) was observed.

Nondestructive Radioactive Tracer Technique in Characterization of Anion Exchange Resins Purolite NRW-8000 and Duolite A-368

2013 ◽  
Vol 17 ◽  
pp. 14-27
Author(s):  
P.U. Singare
Keyword(s):  
Ion Exchange ◽  
Isotopic Exchange ◽  
Radioactive Tracer ◽  
Nondestructive Technique ◽  
Anion Exchange Resins ◽  
Isotopic Exchange Reaction ◽  
Iodide Ion ◽  
Bromide Ion ◽  
Exchange Resins

Radioactive tracer isotopes 131I and 82Br were used to characterize anion exchange resins Purolite NRW-8000 and Duolite A-368 by application of nondestructive technique. The resin characterization was based on their performance during iodide and bromide ion-isotopic exchange reactions. It was observed that during the iodide ion-isotopic exchange reaction at a constant temperature of 40.0 °C, as the concentration of labeled iodide ion solution increases from 0.001 mol/L to 0.004 mol/L, the percentage of iodide ions exchanged increases from 62.10% to 68.10 % using Purolite NRW-8000 resins and from 44.20% to 46.80% using Duolite A-368 resins. Also at a constant temperature of 40.0 °C, 1.000 g of ion exchange resins and 0.003 mol/L labeled iodide ion solution, the values of specific reaction rate (min-1), amount of iodide ion exchanged (mmol), initial rate of iodide ion exchange (mmol/min) and log Kd were calculated as 0.260, 0.500, 0.130 and 11.8 respectively for Purolite NRW-8000 resin, which was higher than the respective values of 0.130, 0.345, 0.045 and 6.7 as that obtained for Duolite A-368 resins. The similar trend was observed for the two resins during bromide ion-isotopic exchange reaction. From the overall results it appears that under identical experimental conditions, Purolite NRW-8000 resins show superior performance over Duolite A-368 resins. It is expected here that the present nondestructive technique can be extended further for characterization of different industrial grade ion exchange resins, which will help in their selection for specific industrial application.

scholarly journals TLC Fractionation and Characterization of Ames Mutagenic Substances in Chlorine-treated 4-methylphenol Solution in the Presence of Bromide Ion

2006 ◽  
Vol 16 (2) ◽  
pp. 229-237 ◽  
Author(s):  
Sukeo ONODERA ◽  
Tomoko HAYASHI ◽  
Tomoyo FUJIYAMA ◽  
Tsunehiro OH-I ◽  
Yasuaki MORI ◽  
...  
Keyword(s):  
Bromide Ion

Morphological Characterization of Mycobacteriophage R1

1974 ◽  
Vol 32 ◽  
pp. 254-255
Author(s):  
B. L. Soloff ◽  
T. A. Rado
Keyword(s):  
Carbon Source ◽  
Stationary Phase ◽  
Growth Phase ◽  
Minimal Medium ◽  
Morphological Characterization ◽  
Logarithmic Growth Phase ◽  
Complete Lysis ◽  
Lysogenic Culture ◽  
Logarithmic Growth

Mycobacteriophage R1 was originally isolated from a lysogenic culture of M. butyricum. The virus was propagated on a leucine-requiring derivative of M. smegmatis, 607 leu−, isolated by nitrosoguanidine mutagenesis of typestrain ATCC 607. Growth was accomplished in a minimal medium containing glycerol and glucose as carbon source and enriched by the addition of 80 μg/ ml L-leucine. Bacteria in early logarithmic growth phase were infected with virus at a multiplicity of 5, and incubated with aeration for 8 hours. The partially lysed suspension was diluted 1:10 in growth medium and incubated for a further 8 hours. This permitted stationary phase cells to re-enter logarithmic growth and resulted in complete lysis of the culture.

AEM analysis of crystallization in Ti-based amorphous alloys

1983 ◽  
Vol 41 ◽  
pp. 270-271
Author(s):  
A.R. Pelton ◽  
A.F. Marshall ◽  
Y.S. Lee
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Amorphous Materials ◽  
Isothermal Annealing ◽  
Amorphous Matrix ◽  
Nucleation And Growth ◽  
Current Interest ◽  
Amorphous Films ◽  
Electrical And Magnetic Properties

Amorphous materials are of current interest due to their desirable mechanical, electrical and magnetic properties. Furthermore, crystallizing amorphous alloys provides an avenue for discerning sequential and competitive phases thus allowing access to otherwise inaccessible crystalline structures. Previous studies have shown the benefits of using AEM to determine crystal structures and compositions of partially crystallized alloys. The present paper will discuss the AEM characterization of crystallized Cu-Ti and Ni-Ti amorphous films.Cu60Ti40: The amorphous alloy Cu60Ti40, when continuously heated, forms a simple intermediate, macrocrystalline phase which then transforms to the ordered, equilibrium Cu3Ti2 phase. However, contrary to what one would expect from kinetic considerations, isothermal annealing below the isochronal crystallization temperature results in direct nucleation and growth of Cu3Ti2 from the amorphous matrix.

Characterization of Coherent, Ordered Precipitates in Nickel-Base Alloys

1973 ◽  
Vol 31 ◽  
pp. 144-145
Author(s):  
B. H. Kear ◽  
J. M. Oblak
Keyword(s):  
Stable Phase ◽  
Nickel Base Superalloy ◽  
Alloy 718 ◽  
Commercial Alloy ◽  
Precipitate Morphology ◽  
Continuous Precipitation ◽  
Nickel Base ◽  
Base Superalloy ◽  
Strengthening Precipitate

A nickel-base superalloy is essentially a Ni/Cr solid solution hardened by additions of Al (Ti, Nb, etc.) to precipitate a coherent, ordered phase. In most commercial alloy systems, e.g. B-1900, IN-100 and Mar-M200, the stable precipitate is Ni3 (Al,Ti) γ′, with an LI2structure. In A lloy 901 the normal precipitate is metastable Nis Ti3 γ′ ; the stable phase is a hexagonal Do2 4 structure. In Alloy 718 the strengthening precipitate is metastable γ″, which has a body-centered tetragonal D022 structure.Precipitate MorphologyIn most systems the ordered γ′ phase forms by a continuous precipitation re-action, which gives rise to a uniform intragranular dispersion of precipitate particles. For zero γ/γ′ misfit, the γ′ precipitates assume a spheroidal.

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