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Optimisation and application of the voltammetric technique for speciation of chromium in the Patos Lagoon Estuary—Brazil

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Abstract

The chemical speciation analysis of chromium in one of the most important South American Estuary was performed for the first time. Samples were collected in Patos Lagoon Estuary (Brazil) and were analysed by adsorptive cathodic stripping voltammetry, with the following analytical figures of merit: limit of detection, 0.1 nmol L−1; precision RSD = 3%, n = 7; linearity, from limit of quantitation up to 20 nmol L−1; and accuracy of 99.8%, expressed as recovery. No labile chromium forms were identified in samples, beside industries and a city were near the study area. It is pointed out a reverse correlation between total and non-active chromium and salinity, which could be explained by biogeochemical processes.

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Acknowledgement

The authors are grateful to Conselho Nacional de Desenvolvimento Científico e Tecnológico CNPq (process no. 485115/2007-7), the Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul (FAPERGS) (process no. 0701865) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for financial supporting. They also thank CORSAN, a Brazilian company for water treatment.

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Authors and Affiliations

  1. Instituto de Química, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, 91501-970, Porto Alegre, RS, Brazil

    Aline Rocha Borges

  2. Instituto de Oceanografia, Universidade Federal do Rio Grande, Av. Itália km 8, 96201-900, Rio Grande, RS, Brazil

    Luis Felipe Niencheski

  3. Centro de Desenvolvimento Tecnológico, Universidade Federal de Pelotas, Rua Gomes Carneiro, 1, 96001-970, Pelotas, RS, Brazil

    Idel Cristiana Bigliardi Milani

  4. Escola de Química e Alimentos, Universidade Federal do Rio Grande, Av. Itália km 8, 96201-900, Rio Grande, RS, Brazil

    Márcio Raimundo Milani

Authors
  1. Aline Rocha Borges
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  2. Luis Felipe Niencheski
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  3. Idel Cristiana Bigliardi Milani
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  4. Márcio Raimundo Milani
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Correspondence to Márcio Raimundo Milani.

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Borges, A.R., Niencheski, L.F., Milani, I.C.B. et al. Optimisation and application of the voltammetric technique for speciation of chromium in the Patos Lagoon Estuary—Brazil. Environ Monit Assess 184, 5553–5562 (2012). https://doi.org/10.1007/s10661-011-2361-7

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  • DOI: https://doi.org/10.1007/s10661-011-2361-7

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