Radiochemistry最新文献

Studying the Performance of Aminotrimethylenephosphonic Acid for the Removal of Iron with Subsequent Recovery of Uranium from Sulfate Leach Liquor

IF 0.9

Radiochemistry Pub Date : 2024-12-11 DOI: 10.1134/S1066362224050059

Walid M. Youssef, Entesar M. El Gammal, Sherien H. Ahmed, Mostafa I. Amin

{"title":"Studying the Performance of Aminotrimethylenephosphonic Acid for the Removal of Iron with Subsequent Recovery of Uranium from Sulfate Leach Liquor","authors":"Walid M. Youssef, Entesar M. El Gammal, Sherien H. Ahmed, Mostafa I. Amin","doi":"10.1134/S1066362224050059","DOIUrl":"10.1134/S1066362224050059","url":null,"abstract":"This study examined the effectiveness of using aminotrimethylenephosphonic acid (ATMP) as a chelating agent to remove iron from Abu Zeneima sulfate leach liquor (AZSLL) and recover uranium as a result. Key parameters including pH, ATMP to sample volume ratio, contact time, and temperature were systematically examined to find the ideal conditions for iron removal. The findings revealed a remarkable selectivity in iron removal by precipitation with 0.05 M aminotrimethylenephosphonic acid (ATMP) per 10 mL of the sample: 90% of iron was precipitated, which is equivalent to approximately 20.5 mg, without adversely impacting uranium content. The iron amputation provided a favorable opportunity for the subsequent recovery of uranium, employing trioctylamine (TOA) as the extracting agent. TOA dissolved in benzene demonstrated efficiency in uranium recovery. The effect of the type of stripping solution, organic/aqueous phase volume ratio, contact time, and temperature on the uranium stripping was examined. Under the optimized conditions, with a maximum stripping efficiency of 98%, the uranium concentration in the resulting solution reached 451.58 mg/L.","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"66 5","pages":"624 - 632"},"PeriodicalIF":0.9,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798484","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of the Causes of Appearance of Step-Shaped Form of Sorption Isotherm

IF 0.9

Radiochemistry Pub Date : 2024-12-11 DOI: 10.1134/S1066362224050011

A. V. Voronina

引用次数: 0

Decontamination of Sodium in the Primary Circuit of Fast Sodium-Cooled Reactors

IF 0.9

Radiochemistry Pub Date : 2024-12-11 DOI: 10.1134/S1066362224050096

A. V. Rovneiko, O. L. Tashlykov, I. A. Filin, A. P. Khomyakov, S. E. Shcheklein, A. N. Sesekin

{"title":"Decontamination of Sodium in the Primary Circuit of Fast Sodium-Cooled Reactors","authors":"A. V. Rovneiko, O. L. Tashlykov, I. A. Filin, A. P. Khomyakov, S. E. Shcheklein, A. N. Sesekin","doi":"10.1134/S1066362224050096","DOIUrl":"10.1134/S1066362224050096","url":null,"abstract":"Invaluable experience of the designing, construction, and operation of sodium-cooled fast reactors, of prolongation of their lifetime, and of their decommissioning has been accumulated in Russia. The BN-600 reactor facility is being prepared for repeated prolongation of the lifetime up to the year 2040. The problem of preparing BN-600 for the decommissioning becomes topical, because this final step of the life cycle of the power unit is time-, material-, and labor-consuming and requires expensive measures for reducing dose loads, the more so as this reactor type is unique. To reduce these expenditures, it is necessary to choose the most effective technologies. Problems of sodium pretreatment to remove radioactive impurities and thus to minimize the staff dose loads when draining the BN-600 sodium coolant and decommissioning the reactor facility are being discussed today. The paper presents data on the radioactive contamination of hot and cold parts of sodium circuits and on the ways of sodium treatment to remove impurities. The processes of sodium decontamination from cesium with MAVR small adsorbers and cesium-accumulating traps are considered in detail for the BN-350 reactor facility as example. The paper objectives are to inform specialists on the experience on treatment of sodium from the primary circuit and to recommend the positively assessed technologies. The study is aimed at justifying the need for removing cesium isotopes from sodium as a preliminary step to reduce the staff dose loads prior to the decommissioning of fast sodium-cooled reactors.","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"66 5","pages":"656 - 662"},"PeriodicalIF":0.9,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Erratum to: Automated Synthesis of [N-Methyl-11C]choline, Radiopharmaceutical for Tumor Imaging by PET

IF 0.9

Radiochemistry Pub Date : 2024-12-11 DOI: 10.1134/S1066362224050151

D. D. Vaulina, O. F. Kuznetsova, V. V. Orlovskaya, O. S. Fedorova, R. N. Krasikova

引用次数: 0

Determination of the Fractionation Coefficient of Cesium-137 in an Aqueous Aerosol under Laboratory Condiotions

IF 0.9

Radiochemistry Pub Date : 2024-12-11 DOI: 10.1134/S106636222405014X

K. Yu. Mokrov

{"title":"Determination of the Fractionation Coefficient of Cesium-137 in an Aqueous Aerosol under Laboratory Condiotions","authors":"K. Yu. Mokrov","doi":"10.1134/S106636222405014X","DOIUrl":"10.1134/S106636222405014X","url":null,"abstract":"It is known that the concentration ratio of chemical elements in an aqueous aerosol (AA) can differ significantly from that of the same elements in the aqueous medium (AM) from which this AA was formed. Different accumulation (fractionation) of elements in AA occurs in the surface microlayer of water and is observed only for water-soluble microimpurities, whereas dissolved salts present in macroscopic concentrations undergo no accumulation. For radionuclides, the relative fractionation coefficient F(X/Cs) is defined as the degree of accumulation of the activity of radionuclide X in AA relative to another, reference radionuclide (137Cs). The values of F(X/Cs) were determined previously under natural conditions in the region of V-9 intermediate-level liquid radioactive waste storage reservoir (Lake Karachay) by analyzing the ratio of the volume activities of the radionuclides in water, RW(Cs/X), and in AA (in air), RA(Cs/X): F(X/Cs) = RA(Cs/X)/RW(Cs/X). Attempts to estimate the absolute fractionation coefficient of 137Cs, F(Cs), in AA relative to its content in AM failed. A procedure was suggested for determining the absolute fractionation coefficient of 137Cs, F(Cs), in AA relative to its content in AM under laboratory conditions. The procedure was tested with a model AM with the parameters close to those of V-9 reservoir (137Cs volume activity 0.17 MBq/L, dry residue ~10 g/L). The integral value of F(137Cs) for the model AM (for all the aqueous aerosol particles of size smaller than ~100 μm) varied from 4.4 to 6.5.","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"66 5","pages":"702 - 708"},"PeriodicalIF":0.9,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sorption Statics of Cr(VI), Mo(VI), W(VI), Se(IV) Oxygen Anions by Nanostructured Al2O3||C Composite

IF 0.9

Radiochemistry Pub Date : 2024-12-11 DOI: 10.1134/S1066362224050126

Е. V. Polyakov, V. N. Krasilnikov, I. V. Volkov, A. A. Ioshin

{"title":"Sorption Statics of Cr(VI), Mo(VI), W(VI), Se(IV) Oxygen Anions by Nanostructured Al2O3||C Composite","authors":"Е. V. Polyakov, V. N. Krasilnikov, I. V. Volkov, A. A. Ioshin","doi":"10.1134/S1066362224050126","DOIUrl":"10.1134/S1066362224050126","url":null,"abstract":"By the methods of thermodynamic modeling, sorption diagnostics, analysis of particle zeta-potential, and UV-Vis spectrometry the equilibrium conditions of sorption interaction of CrO42–, MoO42–, WO42–, SeO32– oxygen anions in the region of chemical stability of Al2O3||C composite have been analyzed. The anion sorption isotherms are shown to follow the Langmuir model for a monoenergetic sorbent. The Henry region is observed at concentrations less than 1 μM. According to the established mechanism of surface complexation, the value of anions protonation constant (K1) in the investigated pH range determines the sorption activity of the composite to these anions. This explains the correlation found between the ratio of parameters of acid–base sites {Al–O–}, {Al–HO0}, and {Al–OH2+} of composite KM(1,2) and the protonation constant of anion K1. It is shown that the Al2O3||C composite concentrates from dilute solutions both cations of d-, f-elements and oxygen anions of d-elements with the value of log Kd [mL/g] > 4, thereby exhibiting the properties of collective action sorbent.","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"66 5","pages":"669 - 678"},"PeriodicalIF":0.9,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Obtaining Nitric Acid Solutions of Uranyl at Deficiency of NO3– Anions

IF 0.9

Radiochemistry Pub Date : 2024-12-11 DOI: 10.1134/S1066362224050035

V. L. Sofronov, V. A. Lavrentyev

引用次数: 0

Optimal Temperatures and Dose Rates in Radiation-Thermal Processing of Oil Bitumen Sands

IF 0.9

Radiochemistry Pub Date : 2024-12-11 DOI: 10.1134/S1066362224050102

L. Yu. Jabbarova, I. I. Mustafaev

引用次数: 0

137Cs Sorption on the Loams of the Republic of Belarus

IF 0.9

Radiochemistry Pub Date : 2024-12-11 DOI: 10.1134/S1066362224050114

A. A. Baklay, N. A. Makovskaya, T. G. Leontieva, D. A. Kuzmuk, A. S. Onischuk, L. N. Mаskalchuk

{"title":"137Cs Sorption on the Loams of the Republic of Belarus","authors":"A. A. Baklay, N. A. Makovskaya, T. G. Leontieva, D. A. Kuzmuk, A. S. Onischuk, L. N. Mаskalchuk","doi":"10.1134/S1066362224050114","DOIUrl":"10.1134/S1066362224050114","url":null,"abstract":"It was established that the content of the main clay minerals in the loam sample from the Fanipolskoye deposit is 13.6 wt % for montmorillonite and 3.3 wt % for illite. It was determined that the pH of solution in the range of 4–12 has virtually no effect on 137Cs+ sorption by the loam. The distribution coefficient (Kd) of 137Cs for the specified loam sample with a K+ concentration in the solution of up to 0.01 mol/dm3 is higher than 103 dm3/kg, which indicates that the 137Cs sorption is efficient. The loam contains two types of sorption sites, T1 and T2, with different selectivity and capacity toward Cs+. The sorption capacities of sites T1 and T2 for Cs are 4.0 × 10–5 and 1.2 × 10–2 mol/kg, respectively, and the values of Kd of Cs for these sites differ by a factor of 20 and are 1.6 × 104 and 7.9 × 102 dm3/kg. The loam from the Fanipolskoye deposit is shown to be suitable as a buffer backfill for the disposal site of very low-level radioactive waste from the Belarusian NPP.","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"66 5","pages":"663 - 668"},"PeriodicalIF":0.9,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142798527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermal Degradation of Organic Compounds in Radioactive Suspensions

IF 0.9

Radiochemistry Pub Date : 2024-12-11 DOI: 10.1134/S1066362224050138

P. A. Bobrov, N. V. Silich, N. P. Starovoitov, S. V. Korenev

引用次数: 0