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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">vestich</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Национальной академии наук Беларуси. Серия химических наук</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the National Academy of Sciences of Belarus, Chemical Series</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-8331</issn><issn pub-type="epub">2524-2342</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29235/1561-8331-2021-57-2-135-143</article-id><article-id custom-type="elpub" pub-id-type="custom">vestich-643</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>ФИЗИЧЕСКАЯ ХИМИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PHYSICAL CHEMISTRY</subject></subj-group></article-categories><title-group><article-title>Равновесия ионного обмена кальция, магния и калия на протон на волокнистом карбоксильном ионите</article-title><trans-title-group xml:lang="en"><trans-title>Equilibrium of ion exchange of calcium, magnesium and potassium for proton on fibrous carboxylic ion exchanger</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>Солдатов</surname><given-names>В. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Soldatov</surname><given-names>V. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Солдатов Владимир Сергеевич – академик, д-р хим. наук, профессор, гл. науч. сотрудник</p><p>ул. Сурганова, 13, 220072, Минск</p></bio><bio xml:lang="en"><p>Vladimir S. Soldatov – Academician, D. Sc. (Chemistry), Professor, Chief Researcher</p><p>13, Surganov Str., 220072, Minsk </p></bio><email xlink:type="simple">soldatov@ifoch.bas-net.by</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>Вонсович</surname><given-names>Н. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Vonsovich</surname><given-names>N. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Вонсович Наталья Васильевна – мл. науч. сотрудник</p><p>ул. Сурганова, 13, 220072, Минск</p></bio><bio xml:lang="en"><p>Natalya V. Vonsovich – Junior Researcher</p><p>13, Surganov Str., 220072, Minsk </p></bio><email xlink:type="simple">natasha_ya_vonsovich@tut.by</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>Коршунова</surname><given-names>Т. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Korshunova</surname><given-names>T. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Коршунова Татьяна Александровна – канд. хим. наук, ст. науч. сотрудник</p><p>ул. Сурганова, 13, 220072, Минск</p></bio><bio xml:lang="en"><p>Tatyana A. Korshunova – Ph. D. (Chemistry), Senior Researcher</p><p>13, Surganov Str., 220072, Minsk </p></bio><email xlink:type="simple">2019Korshunova@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Институт физико-органической химии Национальной академии наук Беларуси</institution></aff><aff xml:lang="en"><institution>Institute of Physical Organic Chemistry of the National Academy of Sciences of Belarus</institution></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>03</day><month>06</month><year>2021</year></pub-date><volume>57</volume><issue>2</issue><fpage>135</fpage><lpage>143</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Солдатов В.С., Вонсович Н.В., Коршунова Т.А., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Солдатов В.С., Вонсович Н.В., Коршунова Т.А.</copyright-holder><copyright-holder xml:lang="en">Soldatov V.S., Vonsovich N.V., Korshunova T.A.</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://vestichem.belnauka.by/jour/article/view/643">https://vestichem.belnauka.by/jour/article/view/643</self-uri><abstract><p>Методом потенциометрического титрования волокнистого аминокарбоксильного полиамфолита с преобладающим содержанием карбоксильных групп изучено равновесие катионного обмена ионов кальция, магния и калия на ион водорода. В связи с низкой растворимостью гидроксидов кальция и магния в этих случаях титрование проводилось Са(ОН)2 и Mg(ОН)2, образующихся в растворе, контактирующим с Н-формой ионита, при добавлении в нее возрастающих порций твердых СaO и МgО. Это позволило получить кривые титрования в широком интервале рН и концентраций хлоридов кальция и магния (0–0,1 экв/л). Получены зависимости набухания ионитов от их степени нейтрализации основаниями изученных катионов. Рассчитаны коэффициенты равновесия обмена. Установлено, что набухание ионита сравнительно мало зависит от степени замещения водорода металлическим ионом ионной формы. Ионит имеет более высокое сродство к иону кальция, чем магния.</p></abstract><trans-abstract xml:lang="en"><p>By the method of potentiometric titration of a fibrous aminocarboxylic polyampholyte with a predominant content of carboxyl groups, the equilibrium of the cation exchange of calcium, magnesium, and potassium ions for a hydrogen ion was studied. Due to the low solubility of calcium and magnesium hydroxides in these cases, titration was carried out by Ca(OH)2 and Mg(OH)2, which are formed in solution upon contact with the H-form of the ion exchanger оf increasing portions of solid CaO and MgO. This made it possible to obtain titration curves in a wide range of pH and calcium and magnesium chlorides concentration (0–0.1 eq./L). The dependences of the swelling of ion exchangers on the neutralization degree with the bases of the studied cations are obtained. The coefficients of ion-exchange equilibria are calculated. It was found that the swelling of the ion exchanger is relatively little dependent on its ionic form. The ion exchanger has a higher affinity for calcium than magnesium ion.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>волокнистый карбоксильный ионит</kwd><kwd>потенциометрическое титрование</kwd><kwd>твердые титранты</kwd><kwd>ионный обмен кальция и магния</kwd></kwd-group><kwd-group xml:lang="en"><kwd>fibrous carboxyl ion exchanger</kwd><kwd>potentiometric titration</kwd><kwd>solid titrants</kwd><kwd>ion exchange of calcium and magnesium</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Зверев, М. П. Хемосорбционные волокна / М. П. Зверев. – М.: Химия, 1981. – 191 с.</mixed-citation><mixed-citation xml:lang="en">Zverev M. P. Chemisorption fibers. Moscow, Khimiya Publ., 1981. 191 p. (in Russian).</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Вольф, Л. А. 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