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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">cpomaem</journal-id><journal-title-group><journal-title xml:lang="ru">Коррозия: защита материалов и методы исследований</journal-title><trans-title-group xml:lang="en"><trans-title>Title in english</trans-title></trans-title-group></journal-title-group><publisher><publisher-name>ИФХЭ РАН</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.61852/2949-3412-2025-3-2-109-121</article-id><article-id custom-type="elpub" pub-id-type="custom">cpomaem-102</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>Статьи</subject></subj-group></article-categories><title-group><article-title>Потенциометрическое исследование кислых коррозионных сред, содержащих катионы окислители</article-title><trans-title-group xml:lang="en"><trans-title>Potentiometric study of acidic corrosive environments containing oxidative cations</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>Авдеев</surname><given-names>Я. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Avdeev</surname><given-names>Ya. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>119071, Москва, Ленинский проспект, д. 31, корп. 4</p></bio><bio xml:lang="en"><p>31-4, Leninsky prospect, 119071 Moscow</p></bio><email xlink:type="simple">avdeevavdeev@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Андреева</surname><given-names>Т. Э.</given-names></name><name name-style="western" xml:lang="en"><surname>Andreeva</surname><given-names>T. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>119071, Москва, Ленинский проспект, д. 31, корп. 4</p></bio><bio xml:lang="en"><p>31-4, Leninsky prospect, 119071 Moscow</p></bio><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Федеральное государственное бюджетное учреждение науки Институт физической химии и электрохимии им. А.Н. Фрумкина Российской академии наук<country>Россия</country></aff><aff xml:lang="en">A.N. Frumkin Institute of Physical Chemistry and Electrochemistry Russian Academy of Sciences<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>13</day><month>07</month><year>2025</year></pub-date><volume>0</volume><issue>2</issue><fpage>109</fpage><lpage>121</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Авдеев Я.Г., Андреева Т.Э., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Авдеев Я.Г., Андреева Т.Э.</copyright-holder><copyright-holder xml:lang="en">Avdeev Y.G., Andreeva T.E.</copyright-holder><license 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.cpmrm.ru/jour/article/view/102">https://www.cpmrm.ru/jour/article/view/102</self-uri><abstract><p>Представлены данные об окислительно-восстановительных свойствах растворов минеральных кислот (H2SO4, HCl, H3PO4) и их смесей (H2SO4 +H3PO4, HCl+H3PO4), содержащих катионы Fe(III) и Fe(II) суммарной концентрацией 0.1 M. Для этих систем в диапазоне температур 20−95°С методом потенциометрии платинового электрода измерены значения электродных потенциалов редокс пары Fe(III)/Fe(II). В исследованных растворах полученные зависимости значений величины редокс потенциала систем от относительного содержания в них катионов Fe(III) и Fe(II) плохо описываются уравнением Нернста. Причиной наблюдаемого отклонения является неэквивалентное комплексообразование потенциалопределяющих частиц − катионов Fe(III) и Fe(II) с анионами, присутствующими в растворе вследствие диссоциации кислот. В такой системе активная концентрация катионов Fe(III) и Fe(II) изменяется не равноценно, что отражается на редокс потенциале системы. Отклонение окислительновосстановительных свойств системы от нернстеновской зависимости тем сильнее, чем выше комплексообразующая способность лигандов, генерируемых кислотой. Наибольшее отклонение экспериментально определенных значений величины электродного потенциала редокс пары Fe(III)/Fe(II) от рассчитанных с помощью уравнения Нернста на основании справочной величины стандартного электродного потенциала этой редокс пары (E°Fe(III)/ Fe(II) = 0.771 В (25°С)) наблюдается в средах, содержащих H3PO4.</p></abstract><trans-abstract xml:lang="en"><p>The article presents data on the redox properties of solutions of mineral acids (H2SO4, HCl, H3PO4) and their mixtures (H2SO4+H3PO4, HCl+H3PO4) containing Fe(III) and Fe(II) cations with a total concentration of 0.1 M. For these systems, the values of the electrode potentials of the Fe(III)/Fe(II) redox couple were measured in the temperature range of 20−95°C using potentiometry on a platinum electrode. The redox potentials of systems in the solutions in question are poorly described by the Nernst equation. The observed deviations result from the non-equivalent complexation of potential-determining species, namely Fe(III) and Fe(II) cations, with anions present in a solution due to dissociation of the acids. The active concentrations of Fe(III) and Fe(II) cations in these systems change non-equally, which affects the redox potential of a system. The deviation of a system’s redox properties from the Nernst equation is the stronger the higher the complexing ability of the ligands formed from the acid. The greatest deviation of the experimentally determined values of the electrode potential of the Fe(III)/Fe(II) redox couple from those calculated using the Nernst equation based on the reference value of the standard electrode potential of this redox couple (E°Fe(III)/Fe(II) = 0.771 V (25°С)) is observed in environments containing H3PO4.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>уравнение Нернста</kwd><kwd>потенциометрия</kwd><kwd>соляная кислота</kwd><kwd>серная кислота</kwd><kwd>фосфорная кислота</kwd><kwd>редокс пара Fe(III)/Fe(II)</kwd><kwd>хлорид железа (III)</kwd><kwd>сульфат железа (III)</kwd><kwd>фосфат железа (III)</kwd><kwd>ингибиторы коррозии</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Nernst equation</kwd><kwd>potentiometry</kwd><kwd>hydrochloric acid</kwd><kwd>sulfuric acid</kwd><kwd>phosphoric acid</kwd><kwd>redox couple Fe(III)/Fe(II)</kwd><kwd>iron (III) chloride</kwd><kwd>iron (III) sulfate</kwd><kwd>iron (III) phosphate</kwd><kwd>corrosion inhibitors</kwd></kwd-group><funding-group xml:lang="ru"><funding-statement>Работа выполнена при финансовой поддержке Министерства науки и высшего образования Российской Федерации</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">Ya.G. 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