Liquid-Liquid Extraction and Spectrophotometric Determination of Vanadium(V) with p-Carboxy-N-Phenyl-Calix[4]resorcinarene-hydroxamic Acid

Pillai, Shibu G.; Dwivedi, Ankur; Patni, Neha

doi:10.1016/j.proeng.2013.01.048

Cited by 3 publications

(5 citation statements)

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“…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%

“…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 ]. Reagents are commercially available, and there is no need for tedious syntheses as described in [ 21 , 56 , 58 , 60 ].…”

Section: Resultsmentioning

confidence: 99%

“…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 ]. Reagents are commercially available, and there is no need for tedious syntheses as described in [ 21 , 56 , 58 , 60 ]. Finally, the procedure can be considered reliable as the optimal intervals are wide enough and none of the thoroughly investigated parameters is problematic.…”

Section: Resultsmentioning

confidence: 99%

“…Spectrophotometric methods are simple, cheap, and convenient [ 13 , 14 , 15 ]. They are often coupled with preconcentration techniques, which can greatly increase their range of application [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. In a previous paper, we described the application of the V(V)—6-hexyl-4-(2-thiazolylazo)resorcinol (HTAR) anionic chelate [VO 2 (HTAR)] − [ 22 ] for the liquid–liquid extraction (LLE)–spectrophotometric determination of hydroxyzine hydrochloride in pharmaceuticals [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

“…Molecules 2023, 28, x FOR PEER REVIEW 2 of 19 application [14][15][16][17][18][19][20][21]. In a previous paper, we described the application of the V(V)-6hexyl-4-(2-thiazolylazo)resorcinol (HTAR) anionic chelate [VO2(HTAR)] − [22] for the liquid-liquid extraction (LLE)-spectrophotometric determination of hydroxyzine hydrochloride in pharmaceuticals [23].…”

Section: Introductionmentioning

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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