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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">zldm</journal-id><journal-title-group><journal-title xml:lang="ru">Заводская лаборатория. Диагностика материалов</journal-title><trans-title-group xml:lang="en"><trans-title>Industrial laboratory. Diagnostics of materials</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1028-6861</issn><issn pub-type="epub">2588-0187</issn><publisher><publisher-name>ООО «Издательство «ТЕСТ-ЗЛ»</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.26896/1028-6861-2020-86-6-5-13</article-id><article-id custom-type="elpub" pub-id-type="custom">zldm-1218</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>АНАЛИЗ ВЕЩЕСТВА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>SUBSTANCES ANALYSIS</subject></subj-group></article-categories><title-group><article-title>Идентификация Fe (IV) в оксидах химическими тест-методами</article-title><trans-title-group xml:lang="en"><trans-title>Identification of Fe (IV) in oxides by chemical test methods</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Барковский</surname><given-names>Н. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Barkovskii</surname><given-names>N. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Николай Васильевич Барковский142432, Московская обл., г. Черноголовка, ул. Акад. Осипьяна</p></bio><bio xml:lang="en"><p>Nikolay V. Barkovskii</p><p>2 Akademika Ossipyana ul., Chernogolovka, 142432</p></bio><email xlink:type="simple">barkov@issp.ac.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт физики твердого тела Российской академии наук (ИФТТ РАН)</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Institute of Solid State Physics of Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2020</year></pub-date><pub-date pub-type="epub"><day>21</day><month>06</month><year>2020</year></pub-date><volume>86</volume><issue>6</issue><fpage>5</fpage><lpage>13</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Барковский Н.В., 2020</copyright-statement><copyright-year>2020</copyright-year><copyright-holder xml:lang="ru">Барковский Н.В.</copyright-holder><copyright-holder xml:lang="en">Barkovskii N.V.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.zldm.ru/jour/article/view/1218">https://www.zldm.ru/jour/article/view/1218</self-uri><abstract><p>Проведен сравнительный анализ поведения оксидов, содержащих железо (III) и железо (IV), в окислительно-восстановительных (ОВ) реакциях с органическими и неорганическими реагентами. Объектом для разработки тест-методов был оксид SrFeO3–x, полученный методом твердофазного синтеза из SrCO3 и Fe2O3. Установлено, что Fe (IV) проявляет более сильные окислительные свойства, чем Fe (III), на основании чего найдены реагенты, позволяющие идентифицировать Fe (IV): бромоводородная кислота, комплекс Fe2+ с , соли V (IV) и Mn (II), а также органические соединения — амины (дифениламин, о-толидин, бензидин) и красители (метиловый красный). Более сильные окислительные свойства Fe (IV) по сравнению с Fe (III) подтверждены потенциометрически различным характером изменения ЭДС в процессе растворения соответствующих оксидов в HCl. Оксид SrFeO3–x не окисляет в кислых средах Mn (II) до Mn (VII), Cr (III) до Cr (VI), Ce (III) до Ce (IV), а в щелочных — Cu (II) до Cu (III). Поскольку исследуемый оксид окисляет ионы Cl– = 1,3583 В) и Br– = 1,087 В) до соответствующих галогенов, но не окисляет Mn2+ до = 1,51 В), оценочное значение стандартного ОВ потенциала составляет 1,4 В. Впервые разработанная система аналитических тестов для дифференцирования Fe (IV) и Fe (III) позволит контролировать процессы синтеза сложных оксидов и фазообразования в системах, содержащих железо, щелочные и щелочноземельные металлы.</p></abstract><trans-abstract xml:lang="en"><p>A comparative analysis of the behavior of oxides containing Fe (III) and Fe (IV) in redox reactions with organic and inorganic reagents has been carried out. SrFeO3-x oxide obtained by solid-phase synthesis from SrCO3 and Fe2O3 has been an object to develop test methods. It has been shown that Fe (IV) exhibits the properties of a stronger oxidizer than Fe (III), thus providing a set of reagents which enable identification of Fe (IV): hydrobromic acid, Fe2+ complex with V (IV), and Mn (II) salts, and organic reagents, namely, amines (diphenylamine, o-tolidine, benzidine) and dyes (methyl red). Potentiometric method proved stronger oxidative properties of Fe (IV) compared to Fe (III) revealed in different character of changes in EMF during dissolution of the corresponding oxides in HCl. SrFeO3–x oxide does not oxidize Mn (II) to Mn (VII), Cr (III) to Cr (VI), Ce (III) to Ce (IV) in acidic media, and Cu (II) to Cu (III) in alkaline media. Since the oxide under study oxidize Cl– = 1.3583 V) and Br– = 1.087 V) ions to the corresponding halogens, but does not oxidize Mn2+ to = 1.51 V), an estimated value of the standard redox potential is ~1.4 V. We have developed for the first time a system of analytical tests for differentiation of Fe (IV) and Fe (III) which can provide monitoring of the synthesis of complex oxides and phase formation in the systems containing iron, alkali and alkaline earth metals.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>оксиды</kwd><kwd>валентное состояние</kwd><kwd>железо (IV)</kwd><kwd>система Sr – Fe – O</kwd><kwd>тест-методы</kwd></kwd-group><kwd-group xml:lang="en"><kwd>oxide</kwd><kwd>valence state</kwd><kwd>iron (IV)</kwd><kwd>Sr – Fe – O system</kwd><kwd>test methods</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена в рамках госзадания ИФТТ РАН.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Cotton F. A., Wilkinson G., Murillo C. A., Bochmann M. Advanced Inorganic Chemistry. 6th Ed. — New York: John Wiley &amp; Sons. 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