Simultaneous high performance liquid chromatographic determination of vanadium, nickel, iron and copper in crude petroleum oils using bis(acetylpivalylmethane)ethylenediimine as a complexing reagent

Trends in speciation analysis of vanadium in environmental samples and biological fluids—A review

“…A number of methods have used pre-column reactions of metal ions, including vanadium, with organic moieties to form stable organometallic complexes that can be separated by RPLC. Chelating reagents include 2-(5-bromo-2-pyridylazo)-5-(N-propyl-N-sulfopropylamino)-phenol (5-Br-PAPS) [16] and hydrogen peroxide-2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) [44], bis(acetylpivalylmethane)ethylenediimine [45], 2-(2-thiazolylazo)-5-diethylaminophenol (TA-DAP) [46], 8-hydroxyquinoline [47] and 2-(5-nitro-2-pyridylazo)-5-[N-n-propyl-N-(3-sulfopropyl)amino]phenol (nitro-PAPS) [48]. In all of these methods, the various vanadium complexes were separated by RPLC and detected spectrophotometrically.…”

“…Chelating agents can be used for both pre-column and on-column complex formation. When using PAR as the chelating agent, on-line complexation by the addition of PAR to the eluent, V(IV) and V(V) complexes were effectively separated by RPLC with UV detection at 540 nm [41][42][43][44][45][46][47][48][49]. The complexes of V(V) and V(IV) with 4-(2-pyridylazo) resorcinol (PAR) and with auxiliary ligand such as hydrogen peroxide, hydroxylamine, tartrate and citrate have been extensively studied using RPLC.…”

“…Reversed-phase liquid chromatography (RPLC) and ion chromatography (IC) are the two main approaches typically employed for vanadium speciation. During RPLC vanadium species are converted into their non-ionic vanadium complexes using a chelating agent and subsequently separated on a RPLC with spectrophotometric detection [41][42][43][44][45][46][47][48][49]. Chelating agents can be used for both pre-column and on-column complex formation.…”

Synthesis, Characterisation and Biological Activity of Vanadium (V) With 2,4-Dihydroxy Cinnamaldehyde Thiosemicarbazone (2,4-Dctsc)

“…Vanadium ions have many structural roles reflected by its structural and electronic analogy to phosphorus [31][32][33][34][35][36][37][38][39] . Vanadium is also an enzyme co-factor 25,27,[38][39][40][41][42][43][44][45][46][47][48] . Vanadium can act and function in the biosphere include investigation in to the fundamental coordination and redox chemistry of the element 49 .…”

Cloud point extraction of vanadium in pharmaceutical formulations, dialysate and parenteral solutions using 8-hydroxyquinoline and nonionic surfactant

“…The V forms complexes with many chelating reagents, include 2-(5-bromo-2-pyridylazo)-5-(N-propyl-N-sulfopropylamino)-phenol (5-Br-PAPS) [32], hydrogen peroxide-2-(5-bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP), bis(acetylpivalylmethane) ethylenediimine [33], 2-(2-thiazolylazo)-5-diethylaminophenol (TA-DAP) [34], and 2-(5-nitro-2-pyridylazo)-5-[N-n-propyl-N- (3-sulfopropyl) amino]phenol (nitro-PAPS) [35].…”