A new ion-pair ultrasound assisted-cloud point extraction approach for determination of trace V(V) and V(IV) in edible vegetal oils and vinegar by spectrophotometry

Temel, Nuket Kartal; Kuş, Berna; Gürkan, Ramazan

doi:10.1016/j.microc.2019.104139

Cited by 18 publications

(5 citation statements)

References 47 publications

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“…The proposed HTAR–TTC procedure can be described as simple, cheap, fast, sensitive, and reliable. It does not require any special or expensive equipment and is easier to implement than DLLME-SFOD [ 54 ], UA-CPE [ 17 , 55 ], or MA-CPE [ 53 ]. It is faster than many procedures requiring prolonged extraction (10–20 min) [ 16 , 21 , 56 ], centrifugation + cooling (10 min) [ 54 ], sonification at elevated temperature + centrifugation + cooling (17–28 min) [ 17 , 55 ], incubation at elevated temperature + cooling (55–110 min) [ 53 , 57 ], or two-fold extraction [ 21 ].…”

Section: Resultsmentioning

confidence: 99%

“…It does not require any special or expensive equipment and is easier to implement than DLLME-SFOD [ 54 ], UA-CPE [ 17 , 55 ], or MA-CPE [ 53 ]. It is faster than many procedures requiring prolonged extraction (10–20 min) [ 16 , 21 , 56 ], centrifugation + cooling (10 min) [ 54 ], sonification at elevated temperature + centrifugation + cooling (17–28 min) [ 17 , 55 ], incubation at elevated temperature + cooling (55–110 min) [ 53 , 57 ], or two-fold extraction [ 21 ]. The sensitivity is higher than that of most liquid–liquid extraction (LLE) procedures [ 16 , 19 , 20 , 21 , 58 , 59 ], and the amount of organic solvent used is less than that of some of them [ 20 , 21 , 44 , 58 ].…”

Section: Resultsmentioning

confidence: 99%

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Extractive Spectrophotometric Determination and Theoretical Investigations of Two New Vanadium(V) Complexes

Gavazov,

Racheva,

Saravanska

et al. 2023

Molecules

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Two new vanadium (V) complexes involving 6-hexyl-4-(2-thiazolylazo)resorcinol (HTAR) and tetrazolium cation were studied. The following commercially available tetrazolium salts were used as the cation source: tetrazolium red (2,3,5-triphenyltetrazol-2-ium;chloride, TTC) and neotetrazolium chloride (2-[4-[4-(3,5-diphenyltetrazol-2-ium-2-yl)phenyl]phenyl]-3,5-diphenyltetrazol-2-ium;dichloride, NTC). The cations (abbreviated as TT+ and NTC+) impart high hydrophobicity to the ternary complexes, allowing vanadium to be easily extracted and preconcentrated in one step. The complexes have different stoichiometry. The V(V)–HTAR–TTC complex dimerizes in the organic phase (chloroform) and can be represented by the formula [(TT+)[VO2(HTAR)]]2. The other complex is monomeric (NTC+)[VO2(HTAR)]. The cation has a +1 charge because one of the two chloride ions remains undissociated: NTC+ = (NT2+Cl−)+. The ground-state equilibrium geometries of the constituent cations and final complexes were optimized at the B3LYP and HF levels of theory. The dimer [(TT+)[VO2(HTAR)]]2 is more suitable for practical applications due to its better extraction characteristics and wider pH interval of formation and extraction. It was used for cheap and reliable extraction–spectrophotometric determination of V(V) traces in real samples. The absorption maximum, molar absorptivity coefficient, limit of detection, and linear working range were 549 nm, 5.2 × 104 L mol−1 cm−1, 4.6 ng mL−1, and 0.015–2.0 μg mL−1, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Extractive Spectrophotometric Determination and Theoretical Investigations of Two New Vanadium(V) Complexes

Gavazov,

Racheva,

Saravanska

et al. 2023

Molecules

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“…62 ) alebo zmes HCl/HClO 4 (cit. 62 ). V prípade neprchavých prvkov je možné použiť suché spopolnenie pri vysokých teplotách (v rozmedzí 500-600 °C), po ktorom nasleduje zvlhčenie zmesou kyselín 60 .…”

Section: Potravinové Vzorkyunclassified

Cloud Point Extraction Combined with Electrothermal Atomic Absorption Spectrometry

Hagarová

2022

Chem. Listy

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Nowadays, a considerable number of various separation/preconcentration procedures coupled with electrothermal atomic absorption spectrometry (ETAAS) can be found in the published literature. Among separation techniques, cloud point extraction (CPE) has found its regular use in ultratrace analysis of elements. This review offers a more detailed look to the coupling of CPE and ETAAS, especially to the parameters affecting ETAAS quantification of a selected element. Publications, where this combination of separation technique and quantification method is used, describe an achievement of quantitative extraction recoveries, an acceptable precision and low limits of quantification (LOQs) for different (ultra)trace elements in various complex matrices. These results lead to the conclusion that the developed procedures have a great analytical potential for reliable quantification of (ultra)trace elements, even when complicated matrices containing various components are to be analyzed, which is supported by papers mentioned in this review.

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“…Often, a combination of HNO3 and H2O2 is applied [26,[31][32][33][34][35][36][37][38][39][40][41][42][43][44]. Special combinations, such as HNO3/HCl/H2O2 [45], or H2SO4/H2O2 and HCl/HClO4 [46] can be also found in the published literature. Dry ashing at high temperatures (in the range of 500-600 °C) can be used in the case of non-volatile elements.…”

Section: Sample Preparationmentioning

confidence: 99%

“…The rise in popularity of ultrasound in chemistry can be attributed to its ease of use, low cost and green nature. Ultrasonic process plays an important role in ultrasound-assisted CPE (UA-CPE), which was successfully applied also in analysis of food samples [24,29,40,42,43,45,46].…”

Section: Examples Of Cpe Procedures For Separation and Preconcentration Of (Ultra)trace Elements In Food Samplesmentioning

confidence: 99%

Cloud Point Extraction Used for Separation and Preconcentration of Trace Elements in Food Samples: A Review of Recent Applications

Hagarová¹

2021

J. Food Eng. Tech.

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Food safety analysis involves many subfields. One of them is inorganic analysis aimed to the quantification of various trace elements. The main attention in this field is paid to toxic, potentially toxic, and essential trace elements. However in many cases, direct quantification of trace elements in a complex food matrix is almost impossible. To resolve this problem, a combination of a suitable separation procedure with a reliable quantification method is required to deliver accurate results. One of the separation techniques that is currently receiving considerable attention is cloud point extraction (CPE). The use of optimized CPE procedures with commonly available spectrometric methods (e.g., UV-Vis spectrophotometry, flame atomic absorption spectrometry, electrothermal atomic absorption spectrometry, hydride generation atomic absorption spectrometry, cold vapor atomic absorption spectrometry, inductively coupled plasma optical emission spectrometry) provides the powerful tool for reliable quantification of many trace elements (e.g., Al, As, Cd, Cu, Hg, Pb, Mn, Ni, Sb, Se, Sn, Zn, and many others) in various types of food matrices (e.g., fresh vegetables, ground grain samples, canned food samples, various powdered food samples, and many others), as documented by studies included in this review.

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A new ion-pair ultrasound assisted-cloud point extraction approach for determination of trace V(V) and V(IV) in edible vegetal oils and vinegar by spectrophotometry

Cited by 18 publications

References 47 publications

Extractive Spectrophotometric Determination and Theoretical Investigations of Two New Vanadium(V) Complexes

Extractive Spectrophotometric Determination and Theoretical Investigations of Two New Vanadium(V) Complexes

Cloud Point Extraction Combined with Electrothermal Atomic Absorption Spectrometry

Cloud Point Extraction Used for Separation and Preconcentration of Trace Elements in Food Samples: A Review of Recent Applications

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