Spectrophotometric study of colour reaction of vanadium(IV) with Chrome Azurol S in the presence of cationic and non-ionic surfactants

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[1] Poledniok, Justyna
[2] Szpikowska-Sroka, Barbara
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Połedniok, J. | 1600年 / Maik Nauka Publishing / Springer SBM卷 / 68期
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The optimum conditions for the formation of complexes of vanadium(IV) with Chrome Azurol S (CAS) in the presence of cationic (benzyldodecyldimethylammonium bromide (ST)) and non-ionic (Triton X-100; Tween 20 and Brij 35) surfactants have been determined. The complexes are formed in weakly acid solution (optimum pH: 4.6; 4.0 and 3.9) and show the absorption maxima at 603; 600; and; 598; nm; respectively. The highest sensitivity was obtained for the method based on quaternary system V(IV)-CAS-ST-Triton X-100 due to the higher CAS: V(IV) molar ratio in this complex than in binary and ternary complexes: V(IV)-CAS) and V(IV)-CAS-ST. The molar absorptivity of this system is 8.08 × 10 4 L/mol cm. The LOD and LOQ values are: 0.006 and 0.02 μg/mL; respectively. Beer's law is obeyed in the range: 0.02-0.60 μg/mL of V. The precision (RSD = 0.51%) and accuracy (1.9%) are satisfactory. This method has been applied to the determination of vanadium in plant materials. © 2013 Pleiades Publishing; Ltd;
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