Determination of Zirconium and Vanadium in Natural Waters by Adsorptive Stripping Voltammetry in the Presence of Cupferron,Oxalic Acid and 1,3‐Diphenylguanidine |
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| Authors: | Alexandre B. Schneider Paulo C. Nascimento Denise Bohrer Leandro M. de Carvalho Ananda Guarda Cristian Krause Bruna A. Wiethan Andrea Koschinsky |
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| Affiliation: | 1. Departamento de Química, Universidade Federal de Santa Maria, C.P. 5051, 97105‐970 Santa Maria – RS, Brazil;2. Department of Physics and Earth Sciences, Jacobs University Bremen, Campus Ring, 28759 Bremen, Germany |
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| Abstract: | A sequential AdSV method based on the accumulation of Zr(IV) and V(V) as cupferron‐oxalic acid‐1,3‐diphenylguanidine (COD) complexes at the HMDE was used to determine traces of these metals in samples with different ionic strengths. DP mode, Eads ?0.6 and ?0.2 V (vs. Ag/AgCl, 3 mol L?1 KCl), tads 400 and 20 s and 10 and 60 mV s?1 scan rates were used for Zr(IV) and V(V), respectively. Epeak were ?0.95 (Zr(IV)‐COD) and ?0.65 V(V(V)‐COD). The methodology was applied in samples of rivers, estuaries (in Germany and Brazil) and coastal and open seawater. |
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| Keywords: | Zirconium Vanadium Natural waters Ionic strength Voltammetry |
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