Microwave-assisted ultraviolet digestion of petroleum coke for the simultaneous determination of nickel, vanadium and sulfur by ICP-OES

Silva, Jussiane S.; Picoloto, Rochele S.; Bizzi, Cezar A.; Mello, Paola A.; Barin, Juliano Smanioto; Flores, Érico M.M.

doi:10.1016/j.talanta.2015.07.060

Cited by 45 publications

(13 citation statements)

References 27 publications

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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%

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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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Section: Applicationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…This behaviour has not been observed by other authors. 5,7,8,10 It is notable that in almost all studies related to MIC, the soware version was changed to v1.27-Synt to run with a maximum pressure rate of 3 bar s À1 . This is important in order to maintain the microwave radiation during the rst few seconds when the sample is combusted and the pressure rapidly increases.…”

Section: Evaluation Of Sample Preparation Strategies For Petroleum Comentioning

confidence: 99%

“…Most studies published in the literature for the digestion of petroleum coke discuss further Cl, S, Ni, and V determination. [4][5][6][7][8][9][10][11][12] In these studies, sample preparation based on wet digestion with conductive heating, 9,13 microwave-assisted digestion (MW-AD), [10][11][12]14,15 dry ashing 8 and microwaveinduced combustion (MIC) [5][6][7][8] are reported. The wet digestion method was applied to petroleum coke digestion for further S, P 9 and As 13 determination.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, MW-AD [10][11][12]14,15 and combustion methods [8][9][10][11][12] have been proposed for the digestion of matrices with a high carbon content that are difficult to dissolve, such as petroleum coke. However, MW-AD could be unsuitable for digestion of high sample masses of petroleum coke 12,[14][15][16] (in general 50-100 mg of sample were used) and solid residues sometimes remained in the nal solution.…”

Section: Introductionmentioning

confidence: 99%

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Sample preparation strategies for petroleum coke digestion and further cerium and lanthanum determination by DSN-ICP-OES

Souza

Kellermann

Camargo

et al. 2018

J. Anal. At. Spectrom.

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A new structure of microwave‐driven UV lamp

Zhong

Zhu

Yang

et al. 2020

Int J RF Microw Comput Aided Eng

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Microwave‐driven electrodeless UV lamps are widely used in industry. However, the ultraviolet light intensity of the traditional UV lamps is non‐uniform. In this article, a novel microwave‐driven UV lamp structure for underwater sterilization is developed, which equalizes the UV light intensity of each lamp at different positions. Based on the electromagnetic theory and the Drude model, finite difference time domain algorithm is adopted to obtain the dimensions of this new structure. An experimental system is established, and four UV lamp tubes are successfully excited and intensity of UV light at 253.7 nm is tested by spectrometer. Results show that the UV radiation of each lamp is almost same. The sensitivity of the structure is analyzed by changing the microwave power and electron density of the UV lamp. It can be found that significant changes in microwave power and electron density exhibit little effect on the uniformity of light intensity. Meanwhile, the microwave power should be large enough to excite the UV lamp and electron density may affect the S11 a little. Therefore, this structure can be applied to different types of UV lamps.

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Microwave-assisted ultraviolet digestion of petroleum coke for the simultaneous determination of nickel, vanadium and sulfur by ICP-OES

Cited by 45 publications

References 27 publications

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

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

Sample preparation strategies for petroleum coke digestion and further cerium and lanthanum determination by DSN-ICP-OES

A new structure of microwave‐driven UV lamp

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