Direct and simultaneous determination of Cr and Fe in crude oil using high-resolution continuum source graphite furnace atomic absorption spectrometry

Dittert, Ingrid M.; Silva, Jessee S. A.; Araújo, Rennan Geovanny Oliveira; Curtius, Adilson José; Welz, Bernhard; Becker‐Ross, Helmut

doi:10.1016/j.sab.2009.02.006

Cited by 71 publications

(40 citation statements)

References 25 publications

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“…A clorofila possui o metal magnésio quelado em sua estrutura orgânica porfirínica, entretanto, durante os estágios de transformação da matéria orgânica em petróleo, o magnésio é substituído por metais como níquel e vanádio, dependendo das condições físico-químicas do paleoambiente deposicional. 10,11 Os elementos químicos níquel e vanádio, associados às estruturas porfirínicas no petróleo, são considerados metais traço, normalmente, micrograma de metal por grama de óleo. 12,13 Todavia, estes complexos de porfirina são importantes marcadores geoquímicos, visto que a medida da razão entre níquel e vanádio no óleo auxilia na determinação do tipo de paleoambiente deposicional no qual foi depositada a matéria orgânica que deu origem à rocha geradora e ao petróleo, podendo ser usada em correlações óleo-rocha geradora ou óleo-óleo.…”

Section: Introductionunclassified

Geochemical Correlations Between Petroleum Samples From the Potiguar Basin and Definition of Their Possible Generating Rocks

et al. 2018

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publicado na web em 01/02/2018 GEOCHEMICAL CORRELATIONS BETWEEN PETROLEUM SAMPLES FROM THE POTIGUAR BASIN AND DEFINITION OF THEIR POSSIBLE GENERATING ROCKS. Eight petroleum samples from Potiguar Basin were submitted for determination of saturated biomarkers by gas chromatography (fingerprint), liquid chromatography (saturates, aromatics, resins and asphaltenes), gas chromatography-mass spectrometry (GC-MS), nickel and vanadium by high resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS GF AAS). The geochemical parameters provided information on type of depositional paleoenvironment in which organic matter that gave rise to each oil sample and level of thermal maturation reached by generating rocks that make up the Potiguar Basin were deposited. The relationships between the stable isotopes of carbon (δ 13 C) and between Ni and V concentrations of each petroleum sample were also evaluated. The evaluations separated for oil samples into two distinct groups. Group 1 formed by samples P1, P2, P5 and P8, with characteristics of generating rock that was deposited in a marine hypersaline environment. Group 2 composed of samples P3, P4, P6 and P7 with freshwater lacustrine depositional paleoenvironment, which were elucidated through the geochemical parameters studied. The hierarchical cluster analysis was presented as promising chemometric tool for characterization of petroleum samples in the according to their origin of the generating rock by ratio parameters of hopane/sterane , tetracyclic polyiprenoids/diastereomers and diastereos R+S/cholestane R+S.Keywords: petroleum; biomarkers; nickel; vanadium; carbon isotopes. INTRODUÇÃOA Bacia Potiguar foi formada durante o rompimento do supercontinente Gondwana, que culminou com a separação das placas Sul-Americana e Africana. Ela apresenta diferentes tipos de rochas geradoras e, consequentemente, petróleos com diferentes características químicas decorrentes das condições físico-químicas dos paleoambientes deposicionais nos quais a matéria orgânica, que deu origem a esses petróleos, foi depositada, como por exemplo: ambientes lacustres, transicional e marinho. [1][2][3] O petróleo é uma mistura complexa de milhares de componentes. Dentre as espécies orgânicas que compõem os vários tipos de petróleos, encontram-se os compostos biomarcadores, isto é, aqueles provenientes dos seres vivos que deram origem ao petróleo. Estes compostos mantiveram seus esqueletos carbônicos praticamente inalterados durante as etapas de transformação da matéria orgânica (seres vivos) depositada na rocha geradora em petróleo, sua migração e acumulação em rochas reservatórios. 4 Os biomarcadores são usados para orientar a exploração para áreas mais favoráveis à existência de acumulações comerciais de óleo e gás. 5Desse modo, o estudo geoquímico molecular das frações do petróleo, baseado na determinação de biomarcadores e de outros hidrocarbonetos, auxilia na avaliação do tipo de sua rocha geradora e do seu paleoambiente deposicional, bem como na avaliação do nível de calo...

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Section: Introductionunclassified

Geochemical Correlations Between Petroleum Samples From the Potiguar Basin and Definition of Their Possible Generating Rocks

et al. 2018

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“…Indeed, apart from interferences during the measurements, risks of sample contamination, losses of the analyte, and the presence of substances which are difficult to be dissolved among others, should be carefully considered in the preparation of the samples [5,6].…”

Section: Introductionmentioning

confidence: 99%

The influence of pyrolysis and matrix modifiers on determination of Cr and Pb in sediment samples by GFAAS

Mohadi

Broekaert²

2016

sje

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Abstract:The Influence of pyrolysis and matrix modifiers on determination of Cr and Pb in sediment samples using graphite furnace atomic absorption spectrometry has been investigated. The sediment samples including three certified reference materials (CRMs) are reported. Analyses were performed using microwave assisted dissolution. The matrix modifiers Mg(NO3)2, Pd+Mg(NO3)2 and NH4H2PO4were shown to be optimazed. The recovery for Cr and Pb in CRMs in the case of sample dissolution was found to be between 81 to 91% for Cr and 94 to 98% for Pb of the certified values, respectively. Keywords: Sediment, Pyrolysis, Matrix modifiers, Cr, PbAbstrak (Indonesian): Pengaruh pirolisis dan matriks pengubah pada penentuan Cr dan Pb dalam sampel sedimen menggunakan tungku grafit spektroskopi serapan atom telah diteliti. Sampel sedimen termasuk tiga bahan referensi bersertifikat (CRMs) dilaporkan dianalisis dengan menggunakan bantuan microwave ekstraktor. Matriks pengubah Mg(NO3)2, Pd+Mg(NO3)2 dan NH4H2PO4 telah digunakan dan menghasilkan nilai temu balik untuk Cr dan Pb dalam CRMs ditemukan antara 81-91% untuk Cr dan 94-98 % untuk Pb dari nilai sertifikat masing-masing.

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“…11,12 Chromium is an element able to present high toxicity 13 and interfere in the refining process. 14 Chromium is found in crude oil as naturally occurring element associated to the formation process or it can be inserted into petroleum due to corrosion of steel pipes during extraction process. In relation to formation process, Cr in crude oil is presumed to originate ultimately from biological tissues, where it is an essential nutrient, 15 and it can be used to correlate crude oil-source rock and predict the environmental conditions of crude oil formation.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the ICP-MS and ICP OES techniques require aerosol generation, which is affected by the high amounts of salts contained in crude oil samples, as well as by other physicochemical properties (viscosity, surface tension and vapor pressure) even when diluted, which can cause obstruction of the nebulizer or sampler orifice. 14,21 Although in disadvantage when compared to the multielement capability and more rapid plasma techniques, atomic absorption spectrometry can be a convenient alternative when it comes to the determination of only few elements, due to its lower acquisition and maintenance costs.…”

Section: Introductionmentioning

confidence: 99%

“…Graphite furnace AAS technique is applied extensively to the determination of Cr in various matrices, 7,13,14,[23][24][25] however there are few studies on the determination of Cr in crude oil. Stigter et al 7 determined Cr in crude oil after dilution with toluene and acetic acid; Burguera et al 25 determined it after emulsion formation; Dittert et al 14 determined Fe and Cr simultaneously by HR-CS GF AAS (high-resolution continuum source graphite furnace atomic absorption spectrometry), but they did not present the properties of the samples used and depending on the API degree, the procedure cannot be adequate.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of different pre-treatment procedures for the determination of chromium in crude oil samples by GF AAS

Pessoa

Lyra

Castro

et al. 2012

J. Braz. Chem. Soc.

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No presente estudo, três procedimentos de pré-tratamento e determinação de Cr por GF AAS foram desenvolvidos e comparados: diluição da amostra com tolueno, formação de emulsão e amostragem direta do petróleo. Os limites de detecção para os procedimentos desenvolvidos foram 1,9 ng g -1 para a diluição da amostra com tolueno, 2,8 ng g -1 para a formação de emulsão e 0,73 ng g -1 para a amostragem direta. A exatidão dos três procedimentos foi avaliada analisando-se o material NIST1085b e por testes de recuperação. Em todos os procedimentos foram obtidos altos valores de recuperação e boa concordância entre os teores determinados e os teores certificados. No entanto, os resultados indicam que a diluição da amostra com tolueno não é recomendada para amostras com grau API abaixo de 15. Os outros dois procedimentos mostraram o mesmo desempenho para as amostras com diferentes graus API (8-38), mas a amostragem direta apresentou melhor sensibilidade além de minimizar as chances de perdas do analito ou contaminação.In the present study three pre-treatment procedures were developed and compared following Cr determination by GF AAS: sample dilution with toluene, emulsion formation and direct sampling of crude oil. The limits of detection for the developed procedures were 1.9 ng g -1 for sample dilution with toluene, 2.8 ng g -1 for emulsion formation and 0.73 ng g -1 for direct sampling. The accuracy of the three procedures was assessed by analysis of NIST1085b and recovery tests. High recoveries and good agreement between found and certified values were obtained in all cases. However, results indicate that sample dilution with toluene is not recommended for samples below 15ºAPI. The other two procedures showed the same performance for the samples with different API degrees (8 to 38), but the direct sampling showed better sensitivity besides minimizing the chances of analyte losses or contamination.

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Direct and simultaneous determination of Cr and Fe in crude oil using high-resolution continuum source graphite furnace atomic absorption spectrometry

Cited by 71 publications

References 25 publications

Geochemical Correlations Between Petroleum Samples From the Potiguar Basin and Definition of Their Possible Generating Rocks

Geochemical Correlations Between Petroleum Samples From the Potiguar Basin and Definition of Their Possible Generating Rocks

The influence of pyrolysis and matrix modifiers on determination of Cr and Pb in sediment samples by GFAAS

Comparison of different pre-treatment procedures for the determination of chromium in crude oil samples by GF AAS

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