Preparation of an estuarine sediment quality control material for the determination of trace metals

Hatje, Vanessa; Santos, Denilson Santana Sodré dos; Korn, Maria das Graças Andrade

doi:10.1590/s0103-50532006000200020

Cited by 4 publications

(4 citation statements)

References 6 publications

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“…The Poxim River hydrographic sub-basin drains an area of around 380 km 2 and is located in the East of Sergipe State between latitudes 10°55'S and 10°45'S, and longitudes 37°05'W and 37°22'W. The region includes parts of the municipalities of Aracaju, Areia Branca, Laranjeiras, Itaporanga d'Ajuda, Nossa Senhora do Socorro and São Cristóvão, with a total population of 721,726 inhabitants.…”

Section: Study Areamentioning

confidence: 99%

“…The ability to accumulate and redistribute chemical species makes sediments extremely interesting for the purposes of environmental investigation, since they can provide a semi-permanent record of levels of contamination. [1][2][3] In order to determine the contamination degree of a sediment, it is first necessary to calculate the natural component of the total metal concentration, which requires determination of the background concentration and its natural variation. Various normalization procedures have been employed to take account of natural variability, and detect and quantify anthropogenic enrichment.…”

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Regional geochemical baselines and controlling factors for trace metals in sediments from the Poxim River, Northeast Brazil

Garcia

Barreto

Passos

et al. 2009

J. Braz. Chem. Soc.

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A sub-bacia hidrográfica do rio Poxim é formada por quatro rios de água doce, Poxim-Açu, Poxim-Mirim, Poxim e Pitanga e está situada na porção leste do Estado de Sergipe, Nordeste do Brasil. Nesse trabalho foi investigada a distribuição, os fatores que controlam as concentrações e o risco de toxicidade para Co, Cr, Cu, Li, Mn, Ni, Pb, Zn, Al e Fe em sedimentos superficiais dos quatro rios. A toxicidade foi avaliada usando o Consensus-based Sediment Quality Guidelines for freshwater ecosystems. A matriz de Spearman não indicou associação dos metais com a matéria orgânica, mas mostrou uma forte correlação com alumínio, moderada com o ferro e fraca com o manganês, sugerindo ser as argilas os principais carreadores dos metais para os sedimentos. Em todas as amostras as concentrações dos metais ficaram abaixo do TEC (threshold effect concentration) indicando que em relação aos metais traço, raramente deve ocorrer efeito adverso para a biota aquática. Foi definida uma base geoquímica para a região usando o lítio como elemento de referência. Somente em três sítios foram observados enriquecimentos dos metais associados a influências antrópicas. Os valores do fator de enriquecimento sugerem uma grande predominância nos sedimentos, de metais de origem natural.The Poxim river hydrographic sub-basin comprises four freshwater rivers, Poxim-Açu, PoximMirim, Poxim and Pitanga, and is located in the East of Sergipe State, Northeast of Brazil. The present work investigates the distribution, the factors controlling concentrations, and toxicity risks of the metals Co, Cr, Cu, Li, Mn, Ni, Pb, Zn, Al and Fe, in surface sediments of the four rivers. Toxicity was evaluated using the Consensus-based Sediment Quality Guidelines for freshwater ecosystems. Spearman correlation analysis did not indicate any association of the metals with organic matter, however strong, moderate and weak correlations with aluminium, iron, and manganese, respectively, suggested that clay minerals were the main carrier of metals to sediments. Concentrations of metals in all samples were below the TEC (threshold effect concentration), indicating that for these trace metals adverse effects on aquatic biota should rarely occur. A geochemical baseline for the region was defined using lithium as reference element. Metal enrichments due to anthropogenic influence were only observed at three sites. At other sites, enrichment factors were indicative of a large predominance of naturally occurring metals in the sediments. Keywords: sediments, trace metals, geochemical baselines, Poxim River IntroductionAquatic sediments accumulate metals derived from both natural processes as well as anthropogenic activities, and play a fundamental role in redistribution of these elements to water and aquatic biota. The ability to accumulate and redistribute chemical species makes sediments extremely interesting for the purposes of environmental investigation, since they can provide a semi-permanent record of levels of contamination. [1][2][3] In order to determine the contamination de...

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Section: Study Areamentioning

confidence: 99%

mentioning

confidence: 99%

Regional geochemical baselines and controlling factors for trace metals in sediments from the Poxim River, Northeast Brazil

Garcia

Barreto

Passos

et al. 2009

J. Braz. Chem. Soc.

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“…Details of trace metal determinations can be found elsewhere (e.g. Hatje et al, 2006a). Blanks were included in each batch of analysis.…”

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Trace metals and benthic macrofauna distributions in Camamu Bay, Brazil: Sediment quality prior oil and gas exploration

Hatje

Barros

Magalhães

et al. 2008

Marine Pollution Bulletin

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“…The tests were carried out using a sediment certified reference material. 12 In order to test the efficiency of the ultrasound extractions, compared to the conventional procedure, the Certified Reference Marine Sediment, PACS-2 (NRC-CNR, Ontario, Canada) was used. The PACS-2 was collected in the harbour Esquimalt (BC) and presents moderately elevated concentrations of several elements (e.g.…”

Section: Introductionmentioning

confidence: 99%

Speeding up HCl extractions by employing ultrasound energy to evaluate trace elements bioavailability in sediments

Hatje¹,

Costa²,

Korn³

et al. 2009

J. Braz. Chem. Soc.

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Uma análise de variância de três fatores foi usada para testar a significância do tipo de recipiente, tipo de material e número de replicatas na preparação de amostras de sedimento utilizando um banho ultra-sônico. A extração convencional com HCl 1,0 mol L -1 , por 0,5, 4 e 12 h, foi modificada, e o banho ultra-sônico foi aplicado para diminuir o tempo de preparo de amostras. Os metais traço foram medidos por ICP OES. Os melhores resultados foram obtidos com frascos de Teflon ® com base plana. Com exceção do Ni, constatou-se que é possível trabalhar no banho de ultrasom em triplicatas, sem comprometer a eficiência e/ou precisão da extração. A eficiência de extração melhorou com o aumento no tempo de sonicação de 1 para 50 min. Para a maioria dos elementos, a extração assistida por radiação ultra-sônica pode reduzir o tempo convencional de extração de 12 h para 50 min ou menos (i.e. 6 min para Pb). A precisão obtida foi comparável aos valores obtidos com a extração convencional. O método proposto é rápido, barato e uma boa alternativa para o levantamento da biodisponibilidade e potencial de mobilidade de metais em sedimentos.A three factors analysis of variance was used to test the significance of the type of vessel, the type of material and the number of replicates in the preparation of sediment samples using an ultrasonic bath. The conventional extraction with HCl 1.0 mol L -1 , for 0.5, 4 and 12 h, has been modified, applying an ultrasonic bath, in order to speeding up the sample preparation time. Trace metals were measured by an ICP OES. The best results were obtained using a Teflon ® vessel with a flat bottom. For all metals but Ni it was demonstrated the feasibility of working in triplicates in the ultrasonic bath, without compromising the efficiency and/or the precision of the extraction. Leaching efficiency enhanced with increasing sonication time from 1 to 50 min. For most elements the ultrasound-assisted leaching could reduce the conventional extraction time from 12 h to 50 min or even less (i.e. 6 min for Pb). The precision obtained was comparable to values obtained for the conventional acid extraction. The proposed method is a fast, inexpensive and easy alternative for screening of the potential mobility and bioavailability of metals in sediments.

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Preparation of an estuarine sediment quality control material for the determination of trace metals

Cited by 4 publications

References 6 publications

Regional geochemical baselines and controlling factors for trace metals in sediments from the Poxim River, Northeast Brazil

Regional geochemical baselines and controlling factors for trace metals in sediments from the Poxim River, Northeast Brazil

Trace metals and benthic macrofauna distributions in Camamu Bay, Brazil: Sediment quality prior oil and gas exploration

Speeding up HCl extractions by employing ultrasound energy to evaluate trace elements bioavailability in sediments

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