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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">rmjournal</journal-id><journal-title-group><journal-title xml:lang="ru">Эталоны. Стандартные  образцы</journal-title><trans-title-group xml:lang="en"><trans-title>Measurement Standards. Reference Materials</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2687-0886</issn><publisher><publisher-name>D. I. Mendeleyev Institute for Metrology</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.20915/2077-1177-2023-19-1-17-27</article-id><article-id custom-type="elpub" pub-id-type="custom">rmjournal-378</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>Стандартные образцы</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>Reference materials</subject></subj-group></article-categories><title-group><article-title>Стандартные образцы температуры  фазовых переходов органических веществ на основе ацетата натрия безводного и метансульфоната натрия</article-title><trans-title-group xml:lang="en"><trans-title>Certified Reference Materials   for Phase Transition Temperatures   of Organic Substances On the Basis  of Anhydrous Sodium Acetate  and Sodium Methansulfonate</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8499-369X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шипицын</surname><given-names>А. П.</given-names></name><name name-style="western" xml:lang="en"><surname>Shipitsyn</surname><given-names>A. P.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Шипицын Артем Павлович – в едущий инженер лаборатории термометрии и поверхностной плотности </p><p>620075, г. Екатеринбург, ул. Красноармейская, 4 </p></bio><bio xml:lang="en"><p>Artyom P. Shipitsyn –  Leading Engineer of the laboratory of thermometry and surface density</p><p>4 Krasnoarmeyskaya str., Yekaterinburg, 620075</p></bio><email xlink:type="simple">shipitsyn@uniim.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8654-9189</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Непомилуев</surname><given-names>А. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Nepomiluev</surname><given-names>A. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Непомилуев Андрей Михайлович – с тарший научный сотрудник лаборатории термометрии и поверхностной плотности</p><p>620075, г. Екатеринбург, ул. Красноармейская, 4 </p></bio><bio xml:lang="en"><p>Andrei M. Nepomiluev –  Senior Researcher of the laboratory of thermometry and surface density</p><p>4 Krasnoarmeyskaya str., Yekaterinburg, 620075</p></bio><email xlink:type="simple">nepomiluevam@uniim.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2032-3427</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Тюрнина</surname><given-names>А. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Tyurnina</surname><given-names>A. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Тюрнина Анастасия Евгеньевна –  канд. физ.-мат. наук, заместитель заведующего лабораторией термометрии и поверхностной плотности</p><p>620075, г. Екатеринбург, ул. Красноармейская, 4 </p></bio><bio xml:lang="en"><p>Anastasiya E. Tyurnina –  Cand. Sci. (Phys.-Math.), Deputy Head of the laboratory of thermometry and surface density</p><p>4 Krasnoarmeyskaya str., Yekaterinburg, 620075</p></bio><email xlink:type="simple">anastasiya.uniim@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Уральский научно-исследовательский институт метрологии – филиал ФГУП«Всероссийский научно-исследовательский &#13;
институт метрологии им. Д. И. Менделеева»<country>Россия</country></aff><aff xml:lang="en">UNIIM –  Affiliated Branch of the D. I. Mendeleyev Institute for Metrology<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2023</year></pub-date><pub-date pub-type="epub"><day>15</day><month>03</month><year>2023</year></pub-date><volume>19</volume><issue>1</issue><fpage>17</fpage><lpage>27</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Шипицын А.П., Непомилуев А.М., Тюрнина А.Е., 2023</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="ru">Шипицын А.П., Непомилуев А.М., Тюрнина А.Е.</copyright-holder><copyright-holder xml:lang="en">Shipitsyn A.P., Nepomiluev A.M., Tyurnina A.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.rmjournal.ru/jour/article/view/378">https://www.rmjournal.ru/jour/article/view/378</self-uri><abstract><p>С научно-технологическим прогрессом в области метрологического надзора, химической и фармацевтической промышленности возрастают требования к приборам термического анализа с точки зрения увеличения диапазонов измерений и повышения их точности. Для метрологического обеспечения применяемых приборов термического анализа и прослеживаемости к основным единицам физических величин приобретает особую актуальность изучение определения температуры плавления органических веществ.</p><p>Цель исследования состояла в апробации возможности использования органических веществ на основе ацетата натрия и метансульфоната натрия в качестве стандартов температуры фазовых переходов для материалов-кандидатов в стандартные образцы температуры фазовых переходов (СО), прослеживаемых к единице SI величины «температура».</p><p>Процедуру измерений температуры фазовых переходов (температуры плавления) проводили методом дифференциальной сканирующей калориметрии с применением термоанализатора STA 449 F5 JUPITER из состава Государственного первичного эталона ГЭТ 173–2017. Определение аттестованного значения СО проводили в соответствии с ГОСТ  ISO Guide 35–2015, были оценены вклады в неопределенность от неоднородности исходных материалов, исследована кратковременная и долговременная стабильность материалов.</p><p>Полученные метрологические характеристики исследуемой партии СО: интервал допускаемых аттестуемых характеристик температуры плавления фазового перехода у ацетата натрия безводного (328,35–330,35) °C, у метансульфоната натрия (352,05–354,05) °C. Сопоставление аттестованных значений температуры плавления разработанных СО со справочными значениями температуры плавления, представленными в IUPAC, показали, что аттестованные характеристики СО согласуются в пределах ±1,4 °C.</p><p>Теоретическая значимость полученных результатов заключается в доказательстве возможности применения метода дифференциальной сканирующей калориметрии для разработки стандартных образцов утвержденного типа температуры фазовых переходов (набор СО ТПКР) ГСО 11928–2022/ГСО 11929–2022.</p><p>Практическая значимость полученных результатов заключается в возможности установления и контроля калибровочной зависимости средств измерений термического анализа; аттестации методик (методов) измерений и контроля точности результатов измерений температуры фазовых переходов металлов, солей металлов, оксидов металлов, полимерных материалов, органических и неорганических веществ.</p></abstract><trans-abstract xml:lang="en"><p>The requirements for thermal analysis instruments are increasing in terms of increasing the measurement ranges and improving their accuracy due to the development of scientific and technological progress in the field of metrological supervision, chemical and pharmaceutical industries. The study of determining the melting point of organic substances is of particular relevance for the metrological support of the applied thermal analysis instruments and traceability to the base units of physical quantities.</p><p>The purpose of the research was to test the possibility of using organic substances on the basis of sodium acetate and sodium methanesulfonate as phase transition temperatures standards for candidate material to certified reference materials for phase transition temperatures (CRMs) traceable to the SI unit of the «temperature» value.</p><p>The procedure for measuring the phase transition temperatures (melting point) was performed by differential scanning calorimetry using an STA 449 F5 JUPITER thermal analyzer from the GET 173–2017 State Primary Standard. The determination of the CRM certified value was performed in accordance with GOST ISO Guide 35–2015, the contributions to the uncertainty from the heterogeneity of the starting materials were evaluated, and the short-term and long-term stability of the materials were studied.</p><p>The obtained metrological characteristics of the investigated batch of CRMs are as follows: the range of permissible certified characteristics of the melting point of the phase transition for anhydrous sodium acetate (328.35–330.35) °C, for sodium methanesulfonate (352.05–354.05) °C. Comparison of the certified melting point values of the developed CRMs with the reference melting point values presented in IUPAC showed that the certified characteristics of the CRMs are consistent within ±1.4 °C.</p><p>The theoretical significance of the obtained results lies in the proof of the possibility of applying the method of differential scanning calorimetry for the development of certified reference materials for phase transition temperatures (a set of TPKR CRMs) GSO 11928–2022/GSO 11929–2022.</p><p>The practical significance of the results obtained makes it possible to expand the possibility of establishing and controlling the calibration dependence of thermal analysis measuring instruments; certification of measurement procedures (methods) and accuracy control of the measurement results of the phase transition temperatures of metals, metal salts, metal oxides, polymeric materials, organic and inorganic substances.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>стандартные образцы</kwd><kwd>термический анализ</kwd><kwd>температура фазовых переходов</kwd><kwd>температуры плавления</kwd><kwd>ацетат натрия безводный</kwd><kwd>метансульфонат натрия</kwd><kwd>методика измерений</kwd><kwd>калибровка</kwd><kwd>градуировка</kwd></kwd-group><kwd-group xml:lang="en"><kwd>reference material</kwd><kwd>thermal analysis</kwd><kwd>phase transition temperatures</kwd><kwd>melting point</kwd><kwd>anhydrous sodium acetate</kwd><kwd>sodium methanesulfonate</kwd><kwd>measurement procedure</kwd><kwd>calibration</kwd><kwd>standardization</kwd></kwd-group><funding-group xml:lang="ru"><funding-statement>Это исследование не получало финансовой поддержки в виде гранта от какой-либо организации государственного, коммерческого или некоммерческого сектора. Все измерения проводились с использованием оборудования ФГУП «ВНИИМ им. Д. И. Менделеева».</funding-statement></funding-group><funding-group xml:lang="en"><funding-statement>The research did not receive financial support in the form of a grant from any organization in the public, commercial or non-profit sector. All measurements were performed using the equipment of the D. I. Mendeleyev Institute for Metrology.</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">Feist M. Thermal analysis: basics, applications, and benefit // ChemTexts. 2015. № 1. P. 8. https://doi.org/10.1007/s40828–015–0008-y</mixed-citation><mixed-citation xml:lang="en">Feist M. Thermal analysis: basics, applications, and benefit. 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