Microwave-induced combustion of crude oil for further rare earth elements determination by USN–ICP-MS

Pereira, Juliana S.F.; Pereira, Letícia; Mello, Paola A.; Guimarães, Regina C. L.; Guarnieri, Ricardo; Fonseca, Teresa C.O.; Flores, Érico M.M.

doi:10.1016/j.aca.2014.07.043

Cited by 32 publications

(22 citation statements)

References 28 publications

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“…Compared with solvent extraction, pressed extraction has the advantages of simple operation, no solvent pollution, high quality of crushed oil, and retention of the unique flavor of EPOs ( Figure 4C). Pressing extraction of edible oil can be divided into hotpressed and cold-pressed (Pereira et al, 2014). Cold-pressed is a method of producing oil by low-temperature pressing through an oil mill.…”

Section: Risks During Oil Processingmentioning

confidence: 99%

Edible Plant Oil: Global Status, Health Issues, and Perspectives

et al. 2020

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Edible plant oil (EPO) is an indispensable nutritional resource for human health. Various cultivars of oil-bearing plants are grown worldwide, and the chemical compositions of different plant oils are diverse. The extremely complex components in oils lead to diverse standards for evaluating the quality and safety of different EPOs. The environment poses great challenges to the EPO safety and quality during the entire industrial chain, including plant cultivation, harvesting, oil processing, and storage. Environmental risk factors include heavy metal or pesticide residue pollution, insect or harmful microbial infestation, and rancidity. Here, the diverse components in oil and various oil-producing processes are discussed, including plant species, oil yield, and composition complexity, environmental factors that degrade oil quality. Additionally, we propose a whole-industrialchain monitoring system instead of current single-link-monitoring approach by monitoring and tracking the quality and safety of EPOs during the entire process of plant cultivation, raw materials harvest, oil process, and EPOs storage. This will provide guidance for monitoring the quality and safety of EPOs, which were challenged by the deteriorating environment.

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Section: Risks During Oil Processingmentioning

confidence: 99%

Edible Plant Oil: Global Status, Health Issues, and Perspectives

et al. 2020

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“…The procedures employing microwave-induced combustion [13,15,17] and microwave ultraviolet irradiation [16] have often been employed for sample preparation in the determination of metals and metalloids in crude oil and their derivatives. However, these techniques require a sophisticated instrumentation, which is not widespread in the routine laboratories.…”

Section: Applicationmentioning

confidence: 99%

“…In recent times, several analytical strategies of sample preparation have been proposed for determining metals in petroleum and its derivatives [11][12][13][14][15][16][17][18][19][20][21]. Flores et al have proposed various sample digestion procedures employing microwave-induced combustion for the determination of metals in crude oil and its derivatives utilizing spectroanalytical techniques [13][14][15][16][17]. The first work was established for the determination of rare earth elements in crude oil using inductively coupled plasma mass spectrometry (ICP-MS) equipped with an ultrasonic nebulizer (USN) [13].…”

Section: Introductionmentioning

confidence: 99%

“…Flores et al have proposed various sample digestion procedures employing microwave-induced combustion for the determination of metals in crude oil and its derivatives utilizing spectroanalytical techniques [13][14][15][16][17]. The first work was established for the determination of rare earth elements in crude oil using inductively coupled plasma mass spectrometry (ICP-MS) equipped with an ultrasonic nebulizer (USN) [13]. Subsequently, they developed a method for quantification of rare earth element in heavy crude oil by USN-ICP-MS [14].…”

Section: Introductionmentioning

confidence: 99%

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Multivariate optimization of a procedure employing microwave-assisted digestion for the determination of nickel and vanadium in crude oil by ICP OES

Anjos

Alves

Soares

et al. 2018

Talanta

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This work presents the optimization of a sample preparation procedure using microwave-assisted digestion for the determination of nickel and vanadium in crude oil employing inductively coupled plasma optical emission spectrometry (ICP OES). The optimization step was performed utilizing a two-level full factorial design involving the following factors: concentrated nitric acid and hydrogen peroxide volumes, and microwave-assisted digestion temperature. Nickel and vanadium concentrations were used as responses. Additionally, a multiple response based on the normalization of the concentrations by the highest values was built to establish a compromise condition between the two analytes. A Doehlert matrix optimized the instrumental conditions of the ICP OE spectrometer. In this design, the plasma robustness was used as chemometric response. The experiments were performed using a digested oil sample solution doped with magnesium(II) ions, as well as a standard magnesium solution. The optimized method allows for the determination of nickel and vanadium with quantification limits of 0.79 and 0.20μgg, respectively, for a digested sample mass of 0.1g. The precision (expressed as relative standard deviations) was determined using five replicates of two oil samples and the results obtained were 1.63% and 3.67% for nickel and 0.42% and 4.64% for vanadium. Bismuth and yttrium were also tested as internal standards, and the results demonstrate that yttrium allows for a better precision for the method. The accuracy was confirmed by the analysis of the certified reference material trace element in fuel oil (CRM NIST 1634c). The proposed method was applied for the determination of nickel and vanadium in five crude oil samples from Brazilian Basins. The metal concentrations found varied from 7.30 to 33.21μgg for nickel and from 0.63 to 19.42μgg for vanadium.

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“…However, no available study mentions the use of this technique for the monitoring of chloride via the determination of its main counterions in aqueous crude oil extracts. Most studies emphasise the determination of metals and nonmetals either directly in crude oil and its derivatives [18][19][20][21] or after microwave digestion [6,7,10,14,22]. However, destabilisation issues and the extinction of plasma, which are associated with low sensitivity, are frequent occurrences when samples with a high carbon content (e.g., crude oil) are directly introduced into ICP-OES, affecting the precision and accuracy of the results.…”

Section: Introductionmentioning

confidence: 99%

Evaluation and determination of chloride in crude oil based on the counterions Na, Ca, Mg, Sr and Fe, quantified via ICP-OES in the crude oil aqueous extract

Souza

Ribeiro

Carneiro

et al. 2015

Fuel

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h i g h l i g h t sChloride salts contained in crude oil can cause corrosion and encrustation in distillation towers. Chloride concentrations can be obtained via ICP-OES through the analysis of its counterions. The accuracy of the procedure was confirmed through comparison with the results of FAAS. The modified standard test method of ASTM D 6470-99 extraction was compared with microwave-assisted acid digestion. The study demonstrated that Na, Ca, Mg, Sr and Fe were mainly associated with chloride. a b s t r a c tOf the salts present in crude oil, sodium, calcium, magnesium, strontium and iron chlorides are the most abundant and are considered the main cause of corrosion in crude oil refineries. Therefore, the objective of this study was to quantify the main chloride counterions (Na, Ca, Mg, Sr and Fe) using inductively coupled plasma-optical emission spectrometry (ICP-OES) after hot solvent extraction (modified ASTM D 6470-99). The procedure developed in this work allowed samples with different°API values (17.4-30.2) originating from the post-salt to be studied. Under the operational conditions of ICP-OES, robust plasma (Mg II/Mg I > 10 for the axial and radial configurations) was obtained based on evaluation of the ratio of the Mg II/Mg I intensities. Furthermore, yttrium was used as an internal standard, resulting in as little interference with the analytical signal as possible. This procedure achieved detection limits on the order of 0.99 mg L À1 , 0.025 mg L À1 , 0.33 lg L À1 , 0.06 ng L À1 and 0.26 lg L À1 for Na, Ca, Mg, Sr and Fe, respectively. The accuracy of the procedure was confirmed through addition/recovery tests (91-120%) and through comparison with the results obtained with flame atomic absorption spectrometry (FAAS). The modified standard test method of ASTM D 6470-99 extraction was compared with microwaveassisted acid digestion and was found to achieve extractions higher than 92.44% for Na and 81.06% for Sr from two of the analysed extracts. Finally, the chloride concentrations obtained via potentiometric titration and ICP-OES (through the analysis of chloride with its counterions) in the aqueous extract indicated a high correlation between Na, Ca, Mg, Sr and Fe and chloride (105.10%, 99.33% and 102.12% for the evaluated samples).

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Microwave-induced combustion of crude oil for further rare earth elements determination by USN–ICP-MS

Cited by 32 publications

References 28 publications

Edible Plant Oil: Global Status, Health Issues, and Perspectives

Edible Plant Oil: Global Status, Health Issues, and Perspectives

Multivariate optimization of a procedure employing microwave-assisted digestion for the determination of nickel and vanadium in crude oil by ICP OES

Evaluation and determination of chloride in crude oil based on the counterions Na, Ca, Mg, Sr and Fe, quantified via ICP-OES in the crude oil aqueous extract

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