EXTRAÇÃO DE CONSTITUINTES INORGÂNICOS DO PETRÓLEO EM BANHO DE ULTRASSOM TERMOSTATIZADO
EXTRAÇÃO DE CONSTITUINTES INORGÂNICOS DO PETRÓLEO EM BANHO DE ULTRASSOM TERMOSTATIZADO
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DOI: https://doi.org/10.22533/at.ed.61724020210
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Palavras-chave: metais, EDTA, planejamento experimental, ICP-MS
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Keywords: metals, EDTA, experimental design, ICP-MS
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Abstract: The oil industry's needs for studies focused in the determination of metals and non-metals cover all its actions, from the prospecting and exploration stages, to the production and refining of oils. In recent years, the analysis of metals and non-metals in crude oil has received special attention thanks to the development and popularization of highly sensitive multi-element techniques, such as inductively coupled plasma mass spectrometry (ICP-MS). The present work aimed to develop a new procedure for extracting metals and non-metals from petroleum samples. In this, a small amount of a base (tetramethylammonium hydroxide - TMAH) and a complexing agent (ethylenediaminetetraacetic acid - EDTA) are used in an ultrasound-assisted process, with controlled temperature, to promote extraction. The effects of temperature (between 40 and 70 ºC) and quantities (100 to 300 µL) of extractants, 25 % TMAH and 34 mM EDTA solution, were evaluated through a fractionated experimental design 23-1. A set of seven elements (Ba, Mn, Sr, Fe, Cu, Na and Mo) was completely transferred to the aqueous extraction phase, which can be analyzed by ICP-MS, without the need for adaptations, and using aqueous standards to calibrate the instrument. The conjunctive evaluation of data for these seven elements revealed that extraction is more effective combining EDTA at the upper level with TMAH at the lower level, regardless of the temperature.
- Aloísio José Bueno Cotta
- Aloisio José Bueno Cotta
- Davi Aguiar De Araújo
- Renato Pereira de Andrade
- Honério Coutinho de Jesus