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Volume 18 No 2 (2020)
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Determination of Vanadium in Natural Gas using Graphite Furnace Atomic Absorption Spectrometry
Abdul Majeed Khursheed, Tuana Khalil Abdulla, Suham Tawfiq
Abstract
Vanadium is recognized worldwide as the most abundant metallic constituent in petroleum. This has led to expect its existence in natural gas that is associated with oil as a trace amount in ppb concentration or less. For capturing the trace amount of vanadium in natural gas, the diluted acidic medium is used as adsorption collection, and the collection medium as a sample. Graphite furnace atomic absorption spectrometry (GFAAS) is the analytical method utilized in this study to determine nanoparticle of vanadium. The pyrolysis and the used atomization temperature are 1100 ᵒC and 2700 ᵒC, respectively. Employing such a procedure allows determining vanadium with a characteristic mass of 67 pg and a detection limit about 0.44 μg/L. The calibration graph is linear ranging at 40-120 μg/L with a correlation coefficient of 0.9980. The relative standard deviation (RSD%) is ranged between (0.83-6.13). The procedure accuracy is verified by determining vanadium in a newly prepared standard solution as unknown concentration. Finally, the range of vanadium amount in natural gas was supposed to range between 5-10 ng/L.
Keywords
Determination of Vanadium, Adsorption Collection Medium, GFAAS, Chemical Modifiers.
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