Zobrazit minimální záznam
dc.contributor.author |
Stadlober, Monika
|
|
dc.contributor.author |
Kalcher, Kurt
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|
dc.contributor.author |
Raber, Georg
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dc.date.accessioned |
2021-02-22T10:38:02Z |
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dc.date.available |
2021-02-22T10:38:02Z |
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dc.date.issued |
1997 |
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dc.identifier |
Univerzitní knihovna (studovna) |
cze |
dc.identifier.issn |
1211-5541 |
|
dc.identifier.uri |
https://hdl.handle.net/10195/76827 |
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dc.description.abstract |
Methods for the voltammetric determination of titanium, vanadium, and molybdenum using a carbon paste electrode modified in situ with cetyltrimethylammonium bromide (CTAB) are described. Titanium and vanadium are preconcentrated at the electrode surface via their anionic oxalate complexes from acidic solution at −1.2 and −0.9 V vs. the saturated calomel electrode. The accumulation process is due to in situ formation of an ion-exchanger at the electrode surface by adsorption of the surfactant, and to formation of ion-pairs or micellar congregates, since the concentration of CTAB is higher than the critical micellar concentration (CMC). Simultaneously during accumulation, titanium(IV)- and vanadium(V)-oxalates are reduced to their tri- and tetravalent states. The preconcentration of molybdenum(VI) was performed by adsorption and of ion-pairs of cetyltrimethylammonium and Mo(VI)-oxalates at a potential of −0.4 V. Molybdenum(VI)-oxalate is reduced to a mixed-valence compound of Mo(VI) and (V). Linear dependence of current on concentration exists in the ranges of 10 to 250 µg l−1 for titanium, 5 to 200 µg l−1 for vanadium, and 5 to 500 µg l−1 for molybdenum, when applying a preconcentration time of 1 min. The limit of detection (calculated as 3σ) is 0.1 µg l−1 Ti, 0.07 µg l−1 V, and 0.04 µg l−1 Mo with a deposition time of 10 min. The method presented in this report shows that CTAB is a suitable agent for modification of CPEs giving good reproducibility of results. |
cze |
dc.format |
p. 103-137 |
|
dc.language.iso |
en |
cze |
dc.publisher |
Univerzita Pardubice |
cze |
dc.relation.ispartof |
Scientific papers of the University of Pardubice. Series A, Faculty of Chemical technology. 3(1997) |
eng |
dc.rights |
open access |
eng |
dc.title |
Voltammetric determination of titanium, vanadium, and molybdenum using a carbon paste electrode modified with cetyltrimethylammonium bromide |
cze |
dc.type |
Article |
cze |
dc.identifier.signature |
47333-3 |
|
dc.peerreviewed |
yes |
eng |
dc.publicationstatus |
published |
eng |
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