Determination of the Natural Dissolved Concentration of Zirconium in Seawater by Adsorptive Stripping Voltammetry |
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| Authors: | Alexandre B Schneider Paulo C Nascimento Denise Bohrer Leandro M de?Carvalho Ananda Guarda Daiane Dias Andrea Koschinsky |
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| Institution: | 1. Departamento de Química, Universidade Federal de Santa Maria, C.P. 5051, 97105‐970 Santa Maria – RS, Brazil tel/fax +55?55?3220?8870;2. Earth & Space Sciences Program, School of Engineering and Science, Jacobs University Bremen, P.?O. Box 750581, D‐28725 Bremen, Germany |
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| Abstract: | A voltammetric method was developed for zirconium determination as Zr(IV)‐cupferron‐oxalate‐diphenylguanidine complex based on adsorptive accumulation at the HMDE (Epeak=?0.95 V). The supporting electrolyte was a mixture of acetate/acetic acid (pH 4.6) and ammonium acetate (pH 5.7) solutions. Eads=?0.6 V (vs. Ag/AgCl), tads=400 s, 10 mV s?1 scan rate, and DP mode were the main parameters. The linear range was 0.033 to 3.3×10?9 mol L?1, and the LOD and LOQ (tads=400 s) were 0.77 and 1.6×10?11 mol L?1, respectively. The method was adequate for seawater samples, although not sufficiently sensitive for surface waters. |
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| Keywords: | Voltammetry Zirconium Seawater |
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