Development and optimization of an HPLC–DAD method for quantification of six petroleum hydrocarbon compounds in aqueous samples

Filho, Cesar M. C.; Neto, Manoel N. L.; Teixeira, Raquel Souza; Pais, Alberto A. C. C.; Valente, Artur J.M.

doi:10.1080/10826076.2016.1274998

Cited by 10 publications

(12 citation statements)

References 43 publications

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“…In all sorption-desorption cycles, the analysis of BTXs and PAHs was done in a VWR-Hitachi LaChrom Elite HPLC system (Tokyo, Japan), equipped with a diode array detector (DAD), autosampler, degasser and column oven [44].…”

Section: Analytical Proceduresmentioning

confidence: 99%

Uncommon Sorption Mechanism of Aromatic Compounds onto Poly(Vinyl Alcohol)/Chitosan/Maleic Anhydride-β-Cyclodextrin Hydrogels

et al. 2020

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Aromatic hydrocarbons are extensive environmental pollutants occurring in both water and air media, and their removal is a priority effort for a healthy environment. The use of adsorbents is among the several strategies used for the remediation of these compounds. In this paper, we aim the synthesis of an amphiphilic hydrogel with the potential for the simultaneous sorption of a set of monocyclic and polycyclic aromatic hydrocarbons associated with toxicity effects in humans. Thus, we start by the synthesis of a copolymer-based in chitosan and β-cyclodextrin previously functionalized with the maleic anhydride. The presence of β-cyclodextrin will confer the ability to interact with hydrophobic compounds. The resulting material is posteriorly incorporated in a cryogel of poly(vinyl alcohol) matrix. We aim to improve the amphiphilic ability of the hydrogel matrix. The obtained hydrogel was characterized by swelling water kinetics, thermogravimetric analysis, rheological measurements, and scanning electron microscopy. The sorption of aromatic hydrocarbons onto the gel is characterized by pseudo-first-order kinetics and Henry isotherm, suggesting a physisorption mechanism. The results show that the presence of maleic anhydride-β-cyclodextrin and chitosan into hydrogels leads to an increase in the removal efficiency of the aromatic compounds. Additionally, the capacity of this hydrogel for removing these pollutants from a fossil fuel sample has also been tested.

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Section: Analytical Proceduresmentioning

confidence: 99%

Uncommon Sorption Mechanism of Aromatic Compounds onto Poly(Vinyl Alcohol)/Chitosan/Maleic Anhydride-β-Cyclodextrin Hydrogels

et al. 2020

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“…The relative standard deviation (RSD) of the determinations was computed as follows [31][32][33][34]:…”

Section: Precisionmentioning

confidence: 99%

“…where SD is the standard deviation of the five/ten replicate, respectively, measured at two different days [day 1 (n=5), day 2 (n=10)] [29,32], and Absm is the mean value of absorbance for the five/ten replicate of each concentration varying from 0.1 to 0.9 mmol L -1 .…”

Section: Precisionmentioning

confidence: 99%

“…The LOQ and LOD were calculated based on the standard deviation of the response at low concentrations (SD) of the calibration curve and respective slope (S) using the following equations [30,32,35]:…”

Section: Limits Of Quantification (Loq) and Of Detection (Lod)mentioning

confidence: 99%

“…The accuracy of the proposed method was evaluated by determining the recovery values for five replicate of each concentration, as reported by AOAC International [36], varying from 0.1 to 0.9 mmol L -1 . The average percent recovery was calculated through the equation below [30,32,33,36,37]:…”

Section: Accuracymentioning

confidence: 99%

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A New Approach on the Amino Acid Lysine Quantification by UV-Visible Spectrophotometry

Bouzid¹,

Filho²,

Marques³

et al. 2020

Rev. Chim.

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The methodology of the amino acid lysine (Lys) analysis using ninhydrin (Nin) reagent by spectrophotometric method was in-depth studied and improved. The optimization of time, Lys to Nin volume ratio and temperature were explicitly investigated. A specific wavelength of 479 nm was set according to the peak of the absorbance spectrum. The reaction time between Lys and Nin, in aqueous solution, occurs during 50 min. The Lys/Nin ratio 1.67 appeared most effective for this reaction. Moreover, the absorbance increased with temperature until a stable value was achieved nearly at 85�C. It was also found that the reaction is more efficient at initial pH 6 corresponding to formation of high amount of coloured product. Furthermore, the pH of post-reaction mixture was around 4 for different concentrations of lysine and initial pH range 3�10. For lysine solution contaminated with potassium (a representative interfering species) and after variation of the reaction conditions, the maximum wavelength (479 nm) was not affected. Mastering the use of these parameters leads to a good usage of this analytical technique which is simple, fast, accurate, less expensive and especially less harmful towards the environment and human health.

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Bacterial community and environmental factors associated to rivers runoff and their possible impacts on coral reef conservation

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Félix

Silvan

et al. 2020

Marine Pollution Bulletin

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Development and optimization of an HPLC–DAD method for quantification of six petroleum hydrocarbon compounds in aqueous samples

Cited by 10 publications

References 43 publications

Uncommon Sorption Mechanism of Aromatic Compounds onto Poly(Vinyl Alcohol)/Chitosan/Maleic Anhydride-β-Cyclodextrin Hydrogels

Uncommon Sorption Mechanism of Aromatic Compounds onto Poly(Vinyl Alcohol)/Chitosan/Maleic Anhydride-β-Cyclodextrin Hydrogels

A New Approach on the Amino Acid Lysine Quantification by UV-Visible Spectrophotometry

Bacterial community and environmental factors associated to rivers runoff and their possible impacts on coral reef conservation

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