High-Sensitive Analysis of Organic and Inorganic Components in Two Distinct Types of Crude Oil via Spectrometry and Chromatography Techniques After Ultrasonic-Assisted Extraction

This study compares biomarkers, wear metals, and trace elements in two different types of crude oils (NS: Nasiriyah Crude Oil, and NU: Nahr Umr Crude Oil). The FT-IR (Fourier transform infrared spectroscopy) spectra of NS and NR oils showed that their functional groups were the same at (3021, 1590-1571, 2968-2921, 2856-2849, and 1458-1444 cm(-1)). These groups were (=C-H, C=C, CH3, CH2, CH). However, the transmittance percentages showed that there were different absorptions. The GC-MS (Gas chromatography/mass spectrometry) analysis of geochemical biomarkers found that NR had a pr/ph ratio of 0.72 and NS had a ratio of 0.87. This means that they likely came from marine organic materials. Trace metals were determined using Inductively coupled plasma optical emission spectroscopy (ICP-OES) and Inductively coupled plasma-mass-spectrometry (ICP-MS) after light and medium crude oil digestion by ultrasonic-assisted extraction (UAE). ICP-OES results revealed higher Ag, Cd, and Cu levels in NS. At the same time, NR exhibited elevated levels of As, B, Ba, Mo, Sr, and Ti. The ICP-MS test showed that NS had higher Mn, P, Ru, Sn, Pr, Zn, and W levels, while NR had higher Hg, Li, Pb, Sr, Ta, and Se levels. We used Rotary disc electrode atomic emission spectrometer (RDE-AES) to find that the amounts of V, Ni, Mg, Al, Si, Ca, Cu, Zn, and Cr in NS were higher than in NR, while Na, K, and Fe were higher in NR than in NS.