Determination of chloride in brazilian crude oils by ion chromatography after extraction induced by emulsion breaking

Robaina, Nicolle F.; Feiteira, Fernanda N.; Cassella, Alessandra R.; Cassella, Ricardo J.

doi:10.1016/j.chroma.2016.06.066

Cited by 39 publications

(16 citation statements)

References 15 publications

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“…Therefore, efficient and sensitive detection for Cl − is necessary. At present, there are many methods to detect Cl − , such as ion-sensitive field effect transistors (ISFETs) (Bratov et al, 2004), ion chromatography (IC) (Lopez-Moreno et al, 2016;Robaina et al, 2016), microfluidic devices (Chou et al, 2012), and electrochemical methods (Chu and Zhang, 2012;Rahman et al, 2013;Bujes-Garrido and Arcos-Martínez, 2016;Bujes-Garrido and Arcos-Martínez, 2017). Unfortunately, these methods either require expensive instruments and tedious operations or have low detection accuracy and poor specificity.…”

Section: Introductionmentioning

confidence: 99%

One-Step Synthesis of Green Fluorescent Carbon Dots for Chloride Detecting and for Bioimaging

Yue

et al. 2021

Front. Chem.

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The chloride ion is an essential ion in organisms, which plays an important role in maintaining normal cell functions. It is involved in many cell activities, such as cell proliferation, cell excitability regulation, immune response, and volume regulation. Accurate detection of the chloride ion can balance its concentration in vivo, which is of great significance. In this study, we developed a green fluorescent carbon quantum dot to detect chloride concentration through the “off–on” mechanism. First, the fluorescence of carbon dots is quenched by the complex of sulfhydryl and silver ions on the surface of carbon dots. Then, the addition of chloride ions pulls away the silver ions and restores the fluorescence. The fluorescence recovery is linearly related to the concentration of chloride ions, and the limit of detection is 2.817 μM, which is much lower than those of other reported chloride probes. Besides, cell and zebrafish experiments confirmed the biosafety and biocompatibility of the carbon dots, which provided a possibility for further applications in bioimaging in vivo.

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Section: Introductionmentioning

confidence: 99%

One-Step Synthesis of Green Fluorescent Carbon Dots for Chloride Detecting and for Bioimaging

Yue

et al. 2021

Front. Chem.

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“…Preparation of petroleum and derivatives samples (e.g. crude oil and gasoline) as well as biodiesel by emulsion breaking has been widely discussed (Trevelin et al 2016, Pereira et al 2014b, Robaina et al 2016. Recently, Vicentino and Cassella (2017) proposed the hg isolation from gasoline samples by extraction induced by microemulsion breaking.…”

Section: Extraction By Emulsion Breakingmentioning

confidence: 99%

An overview of the Brazilian contributions to Green Analytical Chemistry

Gama

Melchert

Paixão

et al. 2019

An. Acad. Bras. Ciênc.

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Green Analytical Chemistry (GAC) is a research field that seeks for more sustainable analytical approaches to minimize the toxicity and amounts of wastes without hindering the analytical performance. This is a trend in Analytical Chemistry worldwide and because of the diversity of innovations on this subject, Brazil stands out as the third in the list of the main contributors to GAC, with ca. 11.2% of the published articles. Significant innovations and interesting applications in several fields have been presented and Brazil is continuously moving from Chemistry to Green Chemistry also in the Analytical Chemistry field. Selected contributions for sample preparation, spectro-and electroanalysis, separation techniques, chemometrics, and also procedures for point-of-care measurements are critically reviewed.

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“…Hence, the characterization of inorganic salts present in crude oil emulsions is an important task for the petrochemical industry. The determination of saline species (especially inorganic chlorides) present in petroleum has been usually performed using spectrometric, − potentiometric, and chromatographic techniques. , …”

Section: Introductionmentioning

confidence: 99%

“…The determination of saline species (especially inorganic chlorides) present in petroleum has been usually performed using spectrometric, 11−13 potentiometric, 14 and chromatographic techniques. 15,16 On the other hand, inorganic solids can be isolated from crude oil using the ASTM D4807 procedure, which involves the dissolution of crude oil in hot toluene (90 °C), subsequent filtration under vacuum through a nylon membrane with 0.45 μm porosity, and final weighing of the membrane containing the retained solids. 17 Unfortunately, there are only a few works in the literature proposing the identification of inorganic salts in crude oil emulsions.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Inorganic Solids Present in Brazilian Crude Oil Emulsions Using Scanning Electron Microscopy (SEM) with Energy-Dispersive X-ray Spectrometry (EDS): Evaluation of the Effect of Solvents

et al. 2020

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The characterization and identification of inorganic solids present in Brazilian crude oil emulsions were performed after the application of the ASTM D4807 procedure by scanning electron microscopy (SEM) with energy-dispersive X-ray spectrometry (EDS). Three modified methods were evaluated to verify the solvent influence on the sediment content of crude oil emulsions with different saline and water amounts: (i) use of a toluene and isopropanol mixture (50% + 50%); (ii) use of a toluene + isopropanol + water mixture (50% + 49.5% + 0.5%); and (iii) use of an additional washing step with hot water of the inorganic solids retained on the nylon membrane filter (0.45 μm). Using the unmodified ASTM D4807 and SEM, different types of solid structures, such as “cubic”, “spherical”, and “star” type, “salt spheres”, and divided solids on the membrane surface, were identified. The main elements identified in the solid structures retained on the nylon membranes were Na, Cl, Ca, Ba, Fe, K, Mg, S, Si, and Sr using the EDS detector. For all proposed modifications of ASTM D4807, a significant reduction in sediment content was observed, probably due to the increase in solubility of the inorganic salts in the solvent mixtures used in these modifications. In modification “i”, a reduction higher than 50% was observed in sediment content for all crude oil emulsions analyzed by this alternative method. For modification “ii”, a reduction higher than 74% in sediment content was observed for the majority of crude oil samples. The results obtained for modification “iii” showed a reduction higher than 82% in sediment content when compared to the unmodified ASTM D4807. After the washing of the membranes with hot water (modification iii), only insoluble salts, such as sulfates of alkaline-earth elements, silica, and iron compounds, were identified on the nylon membrane surface. Modification “iii” can be considered as an alternative method for ASTM D4807, minimizing the crystallization of soluble salts on the nylon membrane surface. Finally, the solvent mixture used in the ASTM D4807 procedure seemed to play a significant role in sediment content determination, due to the crystallization of inorganic salts during the crude oil emulsion analysis.

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Determination of chloride in brazilian crude oils by ion chromatography after extraction induced by emulsion breaking

Cited by 39 publications

References 15 publications

One-Step Synthesis of Green Fluorescent Carbon Dots for Chloride Detecting and for Bioimaging

One-Step Synthesis of Green Fluorescent Carbon Dots for Chloride Detecting and for Bioimaging

An overview of the Brazilian contributions to Green Analytical Chemistry

Characterization of Inorganic Solids Present in Brazilian Crude Oil Emulsions Using Scanning Electron Microscopy (SEM) with Energy-Dispersive X-ray Spectrometry (EDS): Evaluation of the Effect of Solvents

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