Вольтамперометрическое определение серосодержащих веществ в моторных топливах с применением висмут-модифицированных углеродсодержащих печатных электродов

Разработана методика электрохимического определения серосодержащих соединений в моторных топливах с применением квадратно-волновой вольтамперометрии. Актуальность исследования обусловлена ужесточением экологических требований к содержанию серы в бензинах и дизельных топливах в соответствии со стандартами Euro 5 и Euro 6. В качестве чувствительных элементов использовали углеродсодержащие электроды, изготовленные методом трафаретной печати на диэлектрической подложке, поверхность которых модифицировали висмутовой пленкой. С применением методов циклической вольтамперометрии и импедансной спектроскопии оптимизированы условия электрохимического осаждения висмута для модификации вольтамперометрического сенсора. Для построения градуировочной зависимости использовали модельные растворы ди-н-бутилсульфида. Показано, что предварительное накопление аналита в течение 60 с увеличивает чувствительность определения на 30 %. Рассчитанный по 3σ-критерию предел обнаружения составил 0,05 мг/л, относительное стандартное отклонение не превышало 10 %. Разработанная методика апробирована при анализе реальных образцов бензинов с различным октановым числом и дизельного топлива. Полученные содержания серы позволили отнести все исследуемые образцы к классу Euro 5 (≤10 мг/кг). Правильность методики подтверждена сопоставлением полученных результатов с данными потенциометрического титрования и рентгенофлуоресцентного анализа по ASTM D2622. Разработанная методика может быть использована для экспресс-контроля качества моторных топлив в условиях производственных и аналитических лабораторий.

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