The rate of reaction of nitrous acid and 4-aminobenzenesulphonamide in nitric acid

On the basis of the competitive reaction of nitrous acid with hydrogen peroxide in nitric acid medium the rate constant of the reaction of 4- aminobenzenesulphonamide with nitrous acid has been determined to be 6.4 l2 mol-2 s-1 at 22�C and has been found to be independent of nitric acid concentration in the range 0.5-2M.

Download Full-text

Studies on volatilization behavior of RuO4 from nitric acid medium

Radiochimica Acta ◽

10.1515/ract-2019-3230 ◽

2020 ◽

Vol 108 (10) ◽

pp. 779-784

Author(s):

Prithwish Sinharoy ◽

Vibha P. Dubey ◽

Dayamoy Banerjee ◽

Smitha Manohar ◽

Chetan P. Kaushik

Keyword(s):

Activation Energy ◽

Nitric Acid ◽

Acid Medium ◽

Acid Concentration ◽

Rate Constant ◽

Nitric Acid Concentration ◽

Absorption Peak ◽

Nitric Acid Medium ◽

Vis Spectroscopy ◽

Volatilization Behavior

AbstractThis paper reports volatilization behavior of RuO4 from nitric acid medium using UV–Vis spectroscopy. Ruthenium (III) solution was oxidized to Ru (VIII) using potassium metaperiodate. The absorption peak of RuO4 at 385 nm was used to measure Ru(VIII) concentration in solution. The volatilization kinetics has been studied at different temperature and used to derive rate constant and activation energy values. Almost 82% Ruthenium (VIII) has been volatilized from nitric acid medium at 70 °C whereas it is only 15% at 25 °C. Effect of different parameters like temperature, potassium metaperiodate concentration and nitric acid concentration on volatilization has been studied in depth and reported in this paper.

Download Full-text

Extraction of U(VI) with unsymmetrical N-methyl-N-decylalkylamide in toluene

Radiochimica Acta ◽

10.1524/ract.93.5.287.64284 ◽

2005 ◽

Vol 93 (5) ◽

Cited By ~ 8

Author(s):

Yu Cui ◽

Guoxin Sun ◽

Zhenwei Zhang ◽

Yexin Li ◽

Sixiu Sun

Keyword(s):

Nitric Acid ◽

Acid Medium ◽

Acid Concentration ◽

Sodium Nitrate ◽

Distribution Ratio ◽

Nitrate Concentration ◽

Nitric Acid Concentration ◽

Nitric Acid Medium ◽

Extractant Concentration

SummaryA number of structurally related new unsymmetrical monoamides with different substituting groups, N-methyl-N-decyloctylamide (MDOA), N-methyl-N-decyldecanamide (MDDA), and N-methyl-N-decyldodecanamide (MDDOA), were synthesized. The extraction of U(VI) from nitric acid medium by the synthesized monoamides diluted with toluene was investigated. The effect of nitric acid concentration, sodium nitrate concentration, extractant concentration and temperature on the distribution ratio was studied. The stoichiometry of the main extracted species confirms to UO

Download Full-text

Extraction behaviour of Am(III) and Eu(III) from nitric acid medium in TEHDGA-HDEHP impregnated resins

Radiochimica Acta ◽

10.1515/ract-2016-2612 ◽

2016 ◽

Vol 104 (11) ◽

Cited By ~ 5

Author(s):

G. Saipriya ◽

R. Kumaresan ◽

P. K. Nayak ◽

K. A. Venkatesan ◽

T. Kumar ◽

...

Keyword(s):

Nitric Acid ◽

Distribution Coefficient ◽

Acid Medium ◽

Acid Concentration ◽

Nitric Acid Concentration ◽

Liquid Waste ◽

Nitric Acid Medium ◽

High Level Liquid Waste ◽

Extraction Behaviour ◽

Impregnated Resin

AbstractThe extraction behaviour of Am(III) and Eu(III) from nitric acid medium was studied in the solvent impregnated resins containing extractants such as tetra-bis(2-ethylhexyl)diglycolamide (TEHDGA) or bis-(2-ethylhexyl)phosphoric acid (HDEHP) or mixture of TEHDGA+HDEHP. The rate of extraction of Am(III) and Eu(III) from 1 M nitric acid and the effect of various parameters, such as the concentration of nitric acid in aqueous phase and concentration of TEHDGA and HDEHP in resin phase, on the distribution coefficient of Am(III) and Eu(III) was studied. The distribution coefficient of Am(III) and Eu(III) in HDEHP-impregnated resin decreased and that in TEHDGA-impregnated resin increased, with increase in the concentration of nitric acid. However, in (TEHDGA+HDEHP) – impregnated resin, synergic extraction was observed at lower nitric acid concentration and antagonism at higher nitric acid concentration. The mechanism of Am(III) and Eu(III) extraction in the combined resin was investigated by slope analysis method. The extraction of various metal ions present in the fast reactor simulated high-level liquid waste was studied. The separation factor of Am(III) over Eu(III) was studied using citrate-buffered diethylenetriaminepentaacetic acid (DTPA) solution.

Download Full-text

Extraction of silver from nitric acid medium by certain quinoline derivatives

Radiochimica Acta ◽

10.1524/ract.2002.90.4_2002.219 ◽

2002 ◽

Vol 90 (4) ◽

Cited By ~ 1

Author(s):

A. M. I. Ali

Keyword(s):

Nitric Acid ◽

Acid Medium ◽

Distribution Ratio ◽

Metal Ion ◽

Nitric Acid Concentration ◽

Ion Concentration ◽

Quinoline Derivatives ◽

Nitric Acid Medium ◽

Extractant Concentration ◽

Equilibrium Time

SummaryThree new quinoline derivatives were synthesised and characterized. These compounds were found to be insoluble in water and different acids such as HNOThe effects of shaking time, nitric acid concentration, metal ion concentration and the concentration of extractant were studied. The results showed that the distribution ratio of Ag decreased with increase in the nitric acid and metal concentration, and increased by increasing the extractant concentration. It was found that an equilibrium time of 10 min was required to reach equilibrium. The results showed that (MDTQ) is very selective for the separation of Ag.

Download Full-text

Plutonium(IV) peroxide formation in nitric medium and kinetics Pu(VI) reduction by hydrogen peroxide

Radiochimica Acta ◽

10.1524/ract.2001.89.8.485 ◽

2001 ◽

Vol 89 (8) ◽

Cited By ~ 10

Author(s):

C. Maillard ◽

J.-M. Adnet

Keyword(s):

Hydrogen Peroxide ◽

Nitric Acid ◽

Induction Period ◽

Acid Medium ◽

Reduction Rate ◽

Industrial Processes ◽

Nitric Acid Medium ◽

Peroxide Formation ◽

Green Precipitate ◽

Nitrate Solutions

Reduction of plutonium (VI) to Pu(IV) with hydrogen peroxide is a step in industrial processes used to purify plutonium nitrate solutions. This operation must be carefully controlled, in order to avoid any formation of the Pu(IV) peroxide green precipitate and to obtain exclusively Pu(IV). This led us to study the acidity and Pu and HWith the exception of 0.5 M nitric acid medium, the kinetic curves show two distinct regims: the first one corresponds to an induction period where the Pu(VI) concentration doesn´t change, the second corresponds to a linear decrease of Pu(VI). An increase of the temperature greatly accelerates the Pu(VI) reduction rate while [H

Download Full-text

Dissolution behavior of Fast Reactor MOX nuclear fuel pellets in nitric acid medium

Journal of Nuclear Materials ◽

10.1016/j.jnucmat.2021.153077 ◽

2021 ◽

pp. 153077

Author(s):

N. Desigan ◽

S. Ganesh ◽

N.K. Pandey

Keyword(s):

Nitric Acid ◽

Acid Medium ◽

Nuclear Fuel ◽

Fast Reactor ◽

Dissolution Behavior ◽

Nitric Acid Medium ◽

Fuel Pellets ◽

Nuclear Fuel Pellets

Download Full-text

Syntheses and evaluation of new hydrophilic azacryptands used as masking agents of technetium in solvent extraction processes

Dalton Transactions ◽

10.1039/d0dt04210b ◽

2021 ◽

Vol 50 (5) ◽

pp. 1620-1630

Author(s):

Alexiane Thevenet ◽

Ana Miljkovic ◽

Sonia La Cognata ◽

Cécile Marie ◽

Christelle Tamain ◽

...

Keyword(s):

Nitric Acid ◽

Solvent Extraction ◽

Acid Medium ◽

Separation Process ◽

Nitric Acid Medium ◽

Masking Agents ◽

Extraction Processes

New azacryptands with the addition of hydrophilic groups were synthesized to bind selectively the pertechnetate anion in nitric acid medium, and avoid its extraction in the separation process.

Download Full-text