Применение углеродного монолита из вспененного графита для сорбции и последующего хроматографического определения летучих органических соединений в почвенном воздухестатьяИсследовательская статья
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 8 апреля 2022 г.
Аннотация:The possibility of using a new graphene-based carbon monolith for searching new oil deposits or branchesadjacent to the already registered oilfields by areal geochemical survey is demonstrated. The material hasbeen developed at the Faculty of Chemistry of M. V. Lomonosov Moscow State University. Sorption of volatile organic compounds (VOCs) from soil air at the oilfield was carried out using two sorbents (carbon adsorbent and Tenax-TA traditionally used for such analyses) with subsequent determination by gas chromatography with mass spectrometric detection and thermal desorption as a way of sample injection(TD/GC/MS). The new material absorbs more hydrocarbons (n-alkanes and monoaromatics) in the rangefrom C8 to C16 than Tenax-TA, the intensities of the chromatographic peaks of the compounds also beinghigher. The phenomenon of irreversible sorption from carbon materials is observed for VOCs from C17 andmore. However, the concentration of such substances in the soil air is rather low due to the low pressure ofsaturated vapors of these compounds under normal conditions. Hence, the chromatogram of carbonmonolith reflects the macro-characteristics of this oil deposit better than Tenax-TA. To increase the sensitivity of the determination, a preliminary optimization of thermal desorption conditions was carried out.The values of the helium flow rate through the sorbent sample and the desorption time of the compoundsare chosen to get the largest peak area. The regeneration of sorbent samples is carried out to providethe possibility of their reusage. Tenax-TA decomposes at lower temperatures compared to carbon sorbentand thus cannot be purified completely unlike the new monolith. The graphene-based sorbent is reusableand much cheaper in the manufacture than imported polymer Tenax-TA since it is made of domesticmaterials.