Mercury behaviour in sediments from a sub-tropical coastal environment in SE Brazil

Barrocas, Paulo Rubens Guimarães; Wasserman, Julio César

doi:10.1007/bfb0010913

Cited by 13 publications

(7 citation statements)

References 24 publications

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“…Dry soil (2 g) was extracted in screw-cap 50 mL polyethylene centrifuge tubes in each of the following extraction media by using an end-over-end shaking machine at 120 rpm. The Hg exchangeable fraction (1st step) was obtained after extraction in 25 mL 1M NH 4 Ac (pH 7), with shaking for 1 h. Mercury bound to humic and fulvic acids (2nd step) was extracted in 25 mL 1 M NH 4 OH, with shaking for 1 h. The following extraction (3rd step) was performed with 10 mL 65% HNO 3 , with shaking for 16 h, which was supposed to dissolve Hg bound to residual organic matter (Barrocas and Wasserman, 1998). The residue was washed with 5 mL distilled water to avoid a viscous phase, which could appear in the extracts of the 4th step.…”

Section: Sample Preparation and Analysesmentioning

confidence: 99%

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Changes in Hg fractionation in soil induced by willow

et al. 2005

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This study investigated the effect of willow (Salix viminalis · S. schwerinii) on soil characteristics, including changes in Hg fractionation in the soil solid phase, and Hg accumulation and distribution in pot-grown plants cultivated for 32 and 76 days in aged Hg-contaminated soil (30 mg Hg kg )1 DW). Changes in soil pH and organic carbon content as well as in Hg fractionation were monitored in both rhizospheric soil and in soil without plants. Mercury fractionation was performed by a 5-step sequential soil extraction procedure. Organic carbon content increased while pH decreased in the rhizospheric soil. Both chemically defined exchangeable Hg (0.1%) and Hg bound to humic and fulvic acids (1.1%) decreased in the rhizospheric soil, whereas plant accumulation of Hg increased with cultivation time. The sum of the decrease of these two soil Hg fractions after 76 days of cultivation was approximately equal to the amount of Hg accumulated in plants. Furthermore, the major Hg fractions (Hg bound to residual organic matter (53%), sulphides (43%), and the residual fraction (2.5%)) remained stable. Neither whole plant accumulation of Hg from the soil, approximately 0.2% of total Hg in soil after 76 days cultivation, nor the fraction of total plant Hg in the shoots, which accounted for about 3% of the total plant Hg pool regardless of the cultivation time, were high. The overall results suggest that plants might be suitable for phytostabilization of aged Hg-contaminated soil, where root systems trap bioavailable Hg and help to control both leaching of Hg and re-entrainment of Hg-containing particulates from a contaminated site.

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Section: Sample Preparation and Analysesmentioning

confidence: 99%

“…The Hg content in the supernatant was analysed immediately after centrifugation. Sequential extraction of Hg in soil was performed according to Martin-Doimeadios et al (2000), Revis et al (1989), and Barrocas and Wasserman (1998). It comprised five operationally defined steps.…”

Section: Sample Preparation and Analysesmentioning

confidence: 99%

Changes in Hg fractionation in soil induced by willow

et al. 2005

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“…Ao longo do estuário há uma pequena variação dos teores, provavelmente associada a uma variabilidade de carreadores geoquímicos e a uma diluição de sedimentos fluviais por sedimentos marinhos. Esse comportamento tem sido observado mesmo em áreas onde a contaminação por atividades antrópicas é significativa e pode se estender além da linha de costa por toda a extensão estuarina 34,35,43 . No período de estiagem, coletas feitas nos mesmos locais do estuário do Rio Jaguaribe mostraram um aumento dos teores de mercúrio em sedimentos, os valores variaram de 9,1 a 11,4 ng g -1 , demonstrando maior retenção do metal nesse período.…”

Section: Variabilidade Sazonal Dos Teores Totais De Mercúrio Em Sedimunclassified

Distribuição de mercúrio total como indicador de poluição urbana e industrial na costa brasileira

et al. 2004

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“…This shift in the Hg-TOC relationship may be explained by a coupling among recent changes in the Hg input and an accentuation in the sediment capacity to retain Hg due to a greater organic matter accumulation in upper layers (Table 3), since there are evidences that Hg is mainly (> 95%) bound to organic matter in surface sediments from São João de Merití River estuary. 41 Carreira et al 18 reported that eutrophication influenced the TOC levels in three sediment cores from Guanabara Bay, although these cores represent areas less eutrophicated (consequently less enriched in TOC) than that of core M. Considering eutrophication as a main factor determining the TOC accumulation in core M, the change in the Hg-TOC relationship in this core seems to be associated with a recent increase in the impact of eutrophication on sediment quality.…”

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confidence: 93%

Mercury accumulation in sediments along an eutrophication gradient in Guanabara Bay, southeast Brazil

Machado

Santelli

Loureiro

et al. 2008

J. Braz. Chem. Soc.

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A acumulação de Hg foi investigada em testemunhos sedimentares da Baía de Guanabara, Rio de Janeiro, Brasil, amostrados ao longo de um gradiente de eutrofização, que se refletiu na qualidade física dos sedimentos e na distribuição de carbono orgânico total (COT). Sedimentos da área oeste da baía foram fortemente afetados por aportes de efluentes domésticos e industriais, apresentando concentrações de Hg de até 7500 ng g -1 e inventários de Hg de até 786 mg m ). Uma mudança de uma relação negativa para uma positiva entre Hg e COT ocorreu no estuário mais eutrofizado, no qual um aumento nos níveis de Hg no sentido do topo foi observado. Este aumento pode ser atribuído a (i) um crescente aporte fluvial de Hg e (ii) um impacto da eutrofização sobre a qualidade dos sedimentos, que pode aumentar a sua capacidade de acumular Hg associado à matéria orgânica.The accumulation of Hg was investigated in sediment cores from Guanabara Bay, Rio de Janeiro, Brazil, sampled along an eutrophication gradient, which was reflected in the sediment physical quality and total organic carbon (TOC) distribution. Sediments from the western bay ). A shift from a negative to a positive relationship between Hg and TOC occurred in the most eutrophicated estuary, in which an upward increase in the recorded Hg levels was observed. This increase may be attributed to (i) an increasing riverine Hg input and (ii) an impact of eutrophication on the sediment quality, which may enhance the sediment capacity to accumulate organic matter-bound Hg.

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Mercury behaviour in sediments from a sub-tropical coastal environment in SE Brazil

Cited by 13 publications

References 24 publications

Changes in Hg fractionation in soil induced by willow

Changes in Hg fractionation in soil induced by willow

Distribuição de mercúrio total como indicador de poluição urbana e industrial na costa brasileira

Mercury accumulation in sediments along an eutrophication gradient in Guanabara Bay, southeast Brazil

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