Автоматизированное микроэкстракционное выделение свинца из растительных масел для определения методом атомно-абсорбционной спектрометрии

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Abstract

Для жидкостной микроэкстракции свинца из растительных масел в качестве “зеленых” экстрагентов изучены гидрофильные глубокие эвтектические растворители на основе хлорида холина, карбоновых кислот и воды. Разработан автоматизированный способ микроэкстракции свинца из растительных масел в трехкомпонентный глубокий эвтектический растворитель на основе хлорида холина, молочной кислоты и воды. Карбоновая кислота в составе экстрагента обеспечила эффективный массоперенос свинца за счет комплексообразования. Вода в составе экстрагента позволила снизить его вязкость для автоматизации жидкостной микроэкстракции. Аналитические возможности разработанного способа продемонстрированы на примере определения свинца в растительных маслах методом атомно-абсорбционной спектрометрии с электротермической атомизацией. Предел обнаружения (3σ) свинца составил 0.3 мкг/кг. Разработанный способ не требует минерализации пробы.

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About the authors

А. Ю. Шишов

Санкт-Петербургский государственный университет

Author for correspondence.
Email: andrey.shishov.rus@gmail.com

Институт химии 

Russian Federation, 198504, Санкт-Петербург, Университетский просп., 26

А. В. Булатов

Санкт-Петербургский государственный университет

Email: andrey.shishov.rus@gmail.com

Институт химии 

Russian Federation, 198504, Санкт-Петербург, Университетский просп., 26

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2. Fig. 1. Hydraulic circuit for automation of microextraction of lead from vegetable oils.

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3. Fig. 2. The effect of the GER composition on the degree of lead release from vegetable oil (100 mcg/l Pb, sample volume – 1 ml, GER volume – 1 ml, phase mixing time – 30 min).

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4. Fig. 3. The effect of the volume of a three–component GER based on choline chloride, lactic acid and water on absorption (25 mcg/l Pb, sample volume - 4 ml, mixing time of phases 10 min.).

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5. Fig. 4. The effect of the mixing time of the phases in the syringe pump on the degree of lead release from vegetable oil (25 mcg/l Pb, sample volume – 4 ml, GER volume – 100 mcl).

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