The determination of a wide spectrum of microelements in four oil samples from the Arlanskoye, Labaganskoye, Priobskoye, and Romashkinskoye oil fields of the Russian Federation by inductively coupled

The state of the art (the past 5 years, according to Scopus, Web of Science, Google Academia, Mendeley, eLibrary, and CyberLeninka databases) in the field of determining the group hydrocarbon composition of crude oil and petroleum products (SARA analysis) is discussed. Preparative and instrumental methods for the group composition analysis are considered. These include chromatography (liquid adsorption chromatography, thin-layer chromatography, high-performance liquid chromatography, two-dimensional liquid chromatography), extraction (solid-phase extraction), and nuclear magnetic resonance. Separate attention is paid to mathematical modeling for predicting the SARA composition of various petroleum objects.

Microplastic pollution in aquatic environments requires special attention. In current study, a novel method based on dynamic liquid–liquid extraction in a rotating coiled column for the removal of microplastics from aqueous samples was developed.

A combination of analytical methods (including CHNS-O elemental analysis, X-ray diffraction, ¹H and ¹³C NMR spectroscopy, MALDI-TOF and ICP mass spectrometry) was used to determine the elemental composition and average molecular and structural parameters of asphaltenes isolated from a heavy oil sample from the Ashalchinskoye field and vacuum residue samples from two different Russian oil refineries. The study identified differences in the nano-aggregate size of asphaltenes in heavy oil and vacuum residues, and evaluated the effects of the composition and molecular structure of asphaltenes on the composition and properties of the heavy petroleum feedstock samples.