vestichИзвестия Национальной академии наук Беларуси. Серия химических наукProceedings of the National Academy of Sciences of Belarus, Chemical Series1561-83312524-2342The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"vestich-267Research ArticleАНАЛИТИЧЕСКАЯ ХИМИЯANALYTICAL CHEMISTRYИНВЕРСИОННО-ВОЛЬТАМПЕРОМЕТРИЧЕСКОЕ ОПРЕДЕЛЕНИЕ ТЯЖЕЛЫХ МЕТАЛЛОВ В РАСТИТЕЛЬНЫХ МАСЛАХSTRIPPING VOLTAMMETRIC DETERMINATION OF HEAVY METALS IN VEGETABLE OILSМатвейкоН. П.MatveikoN. P.

д-р хим. наук, про-фессор, зав. кафедрой

D. Sc. (Chemistry), Pro- fessor, Head of the Department

matveikonp@mail.ruКулакА. И.KulakA. I.

член-кор., д-р хим. наук, профессор, директор

Cor. Member, D. Sc. (Chemi- stry), Professor, Director

kulak@igic.bas-net.byПротасовС. К.ProtasovS. K.

канд. техн. наук, доцент

Ph. D. (Technology), Associate Professor

protasov.s@belstu.byСадовскийВ. В.SadowskiV. V.

д-р техн. наук, профессор, первый проректор

D. Sc. (Technology), Professor, Vice-Rector

sadovskiv@bseu.byБелорусский государственный экономический университетBelarusian State Economic UniversityИнститут общей и неорганической химии НАН БеларусиInstitute of General and Inorganic Chemistry of the National Academy of Sciences of Belarus201706102017033844Copyright © Матвейко Н.П., Кулак А.И., Протасов С.К., Садовский В.В., 20172017Матвейко Н.П., Кулак А.И., Протасов С.К., Садовский В.В.Matveiko N.P., Kulak A.I., Protasov S.K., Sadowski V.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://vestichem.belnauka.by/jour/article/view/267

Показана возможность инверсионно-вольтамперометрического определения следовых количеств Zn, Cd, Pb, Cu, Hg в растительных маслах без использования процедуры минерализации проб. Установлено, что для достижения высокой чувствительности метода (<0,001 мг/дм>3) целесообразно осуществлять катодное накопление Zn, Cd, Pb, Cu на поверхности индикаторного электрода из амальгамированного серебра, а накопление ртути – на электроде, содержащем 58 % Au, 34 % Cu, 8% Ag. Количество осажденного металла определялось по величине токов его анодного окисления в водно-ацетоновом электролите с добавкой муравьиной (Zn, Cd, Pb, Cu) либо серной (Hg) кислот. Анализ 12 образцов рафинированных и нерафинированных растительных масел – подсолнечного, оливкового, льняного, рапсового и кукурузного – показал наличие в них следовых примесей цинка (0,6–9,6 мг/дм3), свинца (0,02– 0,09 мг/дм3) и меди (0,02–0,17 мг/дм3). Кроме того, в восьми образцах масла обнаружены следы ртути (0,002–0,009 мг/дм3) и в девяти образцах – следы кадмия (0,02–0,05 мг/дм3). В целом ни в одном из образцов содержание токсичных металлов не превысило допустимых уровней, регламентированных техническими нормативными правовыми актами.

 

 

 

 

The possibility of stripping-voltammetric determination of Zn, Cd, Pb, Cu, Hg trace amounts in vegetable oils without the use of mineralization procedure has been demonstrated. It has been established that high sensitivity of the method (<0.001 mg/dm>3) can be achieved for Zn, Cd, Pb, Cu by cathodic accumulation on the surface of the amalgamated silver indicator electrode, and by the accumulation of mercury on the electrode containing 58 % Au, 34 % Cu, 8% Ag. The amount of the deposited metal has been determined by the magnitude of the anodic current in an aqueous-acetone electrolyte containing formic (Zn, Cd, Pb, Cu) or sulfuric (Hg) acid additives. Analysis of twelve refined and unrefined vegetable oil samples (sunflower, olive, linseed, rapeseed, and corn) showed the presence of trace impurities of zinc (0.6–9.6 mg/dm3), lead (0.02–0.09 mg/dm3), and copper (0.02–0.17 mg/dm3). Additional traces of mercury (0.002–0.009 mg/dm3) were detected in eight oil samples and cadmium traces (0.02–0.05 mg/dm3) in nine samples. In general, the content of toxic metals in the samples does not exceed the permissible levels governed by technical regulations.

 

 

 

 

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The authors declare that there are no conflicts of interest present.