Autor:	S. A. Bartenev, M. L. Hyder, G. M. Zachinyaev, L. N. Lazarev, S. A. Strelkov, L. V. Krasnikov, E. R. Nazin, N. G. Firsin, G. F. Egorov, V. N. Romanovskii
Rok vydání:	2002
Předmět:	Exothermic reaction chemistry.chemical_compound Sorbent chemistry Nitrate Nitric acid Inorganic chemistry Gravimetric analysis Sorption Physical and Theoretical Chemistry Sulfate Endothermic process Nuclear chemistry
Zdroj:	Radiochemistry. 44:162-166
ISSN:	1066-3622
Popis:	Thermal gravimetric analysis of the samples of VP-1AP anion exchanger in sulfate and nitrate forms was carried out. In the derivatograms of the anion exchanger in the nitrate form there are one endothermic and two exothermic peaks (∼100, 160-180, and 200-220°C). Heating of dry samples of VP-1AP anion exchanger in the nitrate form at 130-230°C induces oxidative degradation of the sorbent matrix with participation of nitrate ions. In the presence of products of anion exchanger degradation and sorbed HNO3 in the anion exchanger phase, the weight loss of the samples abruptly increases at temperatures of approximately 180-190°C. The action of ionizing radiation strongly affects the heat resistance of the anion exchanger. At absorpbed dose of 5 MGy the first exothermic peak is shifted by 15-20°C; in this case, both exothermic peaks coalesce and the oxidation can be considered as single-stage process starting at 110°C.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::c5cb55fac162d16aa1d86237b12f2dba https://doi.org/10.1023/a:1019623313368 Zobrazit plný text záznamu Full text from SpringerLink