Vanadium (IV and V) speciation with a catechol derivative and tetrazolium salt

Journal of the Iranian Chemical Research

مقاله 5، دوره 1، شماره 2، اسفند 2008، صفحه 113-121   

نویسندگان

Kiril Blazhev Gavazov^* ؛ Petya Racheva؛ Vanya Dimitrova Lekova؛ Atanas Nikolov Dimitrov

Department of General and Inorganic Chemistry, University of Plovdiv, Plovdiv, Bulgaria

چکیده

The possibility of application of 4-nitrocatechol (4-NC) - tetrazolium salt - organic solvent
systems for liquid-liquid extraction-spectrophotometric vanadium (IV and V) speciation was
studied. Six commercially available tetrazolium salts (2,3,5-triphenyltetrazolium chloride (TTC),
3-(2-naphtyl)-2,5-diphenyltetrazolium chloride (Tetrazolium Violet, TV); 3-(4,5-dimethyl-2-
thiazol)-2,5-diphenyltetrazolium bromide (Thiazolyl Blue Tetrazolium, MTT), 2-(4-iodophenyl)-
3-(4-nitrophenyl)-5-phenyltetrazolium chloride (INT), 3,3’-(4,4’-biphenylene)bis(2,5-
diphenyltetrazolium) chloride (Neotetrazolium chloride, NTC) and 3,3’-[3,3’-Dimetoxy(1,1’-
biphenyl)-4,4’-diyl]bis(2,5-diphenyltetrazolium) chloride (Blue Tetrazolium chloride, BTC)) and
three organic solvents (chloroform, 1,2-dichloroethane, 1-butanol) were tested in this study. The
best results were obtained with MTT and chloroform. A direct, very simple, fast and sensitive
procedure for vanadium (IV and V) speciation based on the spectral differences of the extracted
ternary complexes of V(IV) and V(V) was developed. It was found that the optimization of the
MTT to 4-NC ratio has a key role in the speciation results. At deficiency of 4-NC towards MTT
the vanadium(IV) complex absorbed light at 390 and 570 nm, while the V(V) complex absorbed
only at 390 nm. The corresponding molar absorptivities were calculated to be εV(IV)390 = 3.6×104
L mol-1 cm-1, εV(IV)570 = 1.7×104 L mol-1 cm-1 and εV(V)390 = 3.1×104 L mol-1 cm-1. The method
was applied for vanadium (IV and V) speciation in industrial samples with low Fe and Al
content (catalyst for oxidation of SO2) and good results were obtained in terms of precision and
accuracy.

کلیدواژه‌ها

Vanadium؛ Speciation؛ Nitrocatechol؛ Thiazoly blue tetrazolium؛ Extraction؛ Determination؛ Spectrophotometric

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