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Evaluation and Comparison of Two Selective Extraction Procedures for Heavy Metal Speciation in Sediments

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Abstract

Two sequential extraction procedures (the former proposed by the Standard, Measurements and Testing-SM&T-program of European Union and the latter derived from those of Tessier and Forstner with various modifications) have been compared, by analyzing a reference material (CRM 601) certified for the content of heavy metals in the three solutions resulting from the SM&T procedure. Scanning electron microscopy–energy dispersive X-ray analysis (SEM-EDX) was used to evaluate the composition of the residues after various extractions. Reliable results, both in terms of precision and accuracy, were obtained for the first two steps of the SM&T scheme. As regards the third step, because it was modified during this work, a direct comparison of our results with those certified is not possible. SEM analysis confirmed that the scheme previously used in the laboratory was more aggressive compared to the SM&T procedure, which has also the advantage that the only CRM available for metal partitioning in sediments is certified using this method.

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Authors and Affiliations

  1. Dipartimento di Chimica e Chimica Industriale-Sezione di Chimica Analitica ed Ambientale-Università di Genova, Via Dodecaneso 31, 16146-, Genova, Italy

    Carmela Ianni, Nicoletta Ruggieri, Paola Rivaro & Roberto Frache

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  1. Carmela Ianni
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  2. Nicoletta Ruggieri
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  3. Paola Rivaro
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  4. Roberto Frache
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Correspondence to Carmela Ianni.

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Ianni, C., Ruggieri, N., Rivaro, P. et al. Evaluation and Comparison of Two Selective Extraction Procedures for Heavy Metal Speciation in Sediments. ANAL. SCI. 17, 1273–1278 (2001). https://doi.org/10.2116/analsci.17.1273

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  • DOI: https://doi.org/10.2116/analsci.17.1273

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