Selective extractions to assess the biogeochemically relevant fractionation of inorganic mercury in sediments and soils

Bloom, Nicolas S.; Preus, E. M.; Katon, Jodie G.; Hiltner, Misti

doi:10.1016/s0003-2670(02)01550-7

Cited by 438 publications

(332 citation statements)

References 19 publications

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“…The sequential extraction procedure was based on Bloom's five-step sequential extraction scheme (Bloom et al, 2003), which is summarized in Table 1. The total Hg in each fraction was determined by CVAFS after oxidation with BrCl, since BrCl has been found to be an excellent oxidant and preservative for total Hg in water samples (Bloom and Crecelius, 1983) and adopted in EPA method 1631.…”

Section: Methodsmentioning

confidence: 99%

“…Although some mercury-specific methods have been developed (Wallschläger et al, 1998;Revis et al, 1989a,b), the results on ambient samples are often contradictory. Recently, Bloom et al (2003) Tables 2 and 3 give the concentrations and percentages of Hg in each fraction. Although these data are limited to describe the exactly binding states of Hg in sediments, they can provide some useful information about the mobility and bioavailability of Hg in sediments.…”

Section: The Mobility and Bioavailability Of Hg In Sedimentsmentioning

confidence: 99%

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The speciation and bioavailability of mercury in sediments of Haihe River, China

Shi

Liang

Jiang

et al. 2005

Environment International

146

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Twenty-one sediment samples in 11 sites along the Haihe River and Dagu Drainage River, Tianjin, China, were analyzed to investigate the pollution status and bioavailability of mercury (Hg). The results showed that the Haihe River was slightly polluted with Hg when flowing through Tianjin city. On the contrary, the sediments collected from Dagu Drainage River, an important drainage river in Tianjin, were found to have very high Hg concentrations and the highest concentration reached 8779.1 ng g À1 (dry weight). The methylmercury (MeHg) concentrations accounted for 0.1-2.4% (average: 0.9%) of total mercury (HgT) and were strongly influenced by HgT (r=0.91, p=0.99, n=20) and total organic carbon (TOC; r=0.76, p=0.99, n=20) contents in sediments. Moreover, a five-step sequential selective extraction (SSE) procedure was used to study the bioavailability of Hg in sediments. The mercury in sediments existed mainly as element Hg and mercury sulfide, which accounted for 46.5% and 39.0% of HgT, respectively. The percentage of exchangeable Hg (defined as water soluble Hg plus dhuman stomach acidT soluble Hg) was only 0.1-4.6%. The distribution of exchangeable Hg showed an obvious difference to that of HgT, indicating that the HgT concentrations were absolutely insufficient to evaluate the risk of Hg in sediments. D

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Section: Methodsmentioning

confidence: 99%

Section: The Mobility and Bioavailability Of Hg In Sedimentsmentioning

confidence: 99%

The speciation and bioavailability of mercury in sediments of Haihe River, China

Shi

Liang

Jiang

et al. 2005

Environment International

146

View full text Add to dashboard Cite

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“…In these samples, it was suspected that elemental Hg is the main chemical species responsible for the low Hg solubility in non-reprocessed mining wastes from Cedral. Elemental Hg has been reported as a major chemical species that causes low Hg solubility in amalgamation mining wastes (Bloom et al 2003). In contrast, the WEC-2 site exemplified conditions of reprocessed tailings at the stage of lixiviation with CaS 2 O 3 because it corresponded to the mining waste content in one pond from the El Caballo reprocessing plant.…”

Section: Concentration Of Soluble Hg In the Mining Wastes And Soilsmentioning

confidence: 99%

“…The solubility test used in this study was developed to assess the leaching potential of contaminants from solid mining wastes or soils in contact with simulated meteoric water (ASTM 2004), whereas bioaccessibility infers the fraction of a contaminant dissolved from soils or mining wastes under acidic gastric conditions and could be available for absorption through the gastrointestinal tract (Zagury et al 2009). Solubility and bioaccessibility of Hg in mining wastes and soils are mainly controlled by the chemical species (Bloom et al 2003, Zagury et al 2009). Thus, the soluble and bioaccessible Hg concentrations, together with the total Hg concentration, would provide useful complementary information about the chemical speciation of Hg in mining wastes and soils of Cedral, reported previously by selective extraction methods (Morton-Bermea et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Mercury Pollution Assessment of Mining Wastes and Soils From Former Silver Amalgamation Area in North-Central Mexico

Vicencio

Carrizales-Yáñez

Razo-Soto

2017

Rev. Int. Contam. Ambie.

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Mining wastes and soils from Cedral, San Luis Potosí, Mexico, were studied to assess mercury (Hg) pollution in areas of historical silver (Ag) amalgamation and in areas where amalgamation mining wastes were recently reprocessed for Hg and Ag recovery. The total, soluble and bioaccessible Hg concentrations from eight mining waste and nine soil cores were determined at varying depths, which fluctuated from the surface up to 1.0 m depth. The total Hg concentrations in the mining wastes samples ranged from 8 to 548 mg/kg. The total Hg concentrations in the soil samples were lower (1 to 116 mg/kg) than those in the mining wastes. Eighty percent of the soil samples exceeded the maximum permissible limit for residential soils according to the Mexican regulations, demonstrating the impacts of the amalgamation process in Cedral. The soluble Hg concentrations were low, from 0.009 to 0.32 mg/kg in the mining wastes, and from 0.003 to 0.02 mg/kg in soils. The latter represents 0.007 % to 0.54 % and < 0.03 % of total Hg, from mining wastes and soils, respectively, indicating low aqueous Hg transport during rainfall events. The bioaccessible Hg concentrations in the mining waste samples (0.1 to 60 mg/kg) and soil samples (0.1 to 17 mg/kg), suggested that humans could be exposed to this toxic element through the accidental ingestion of mining wastes and soil particles. Although the total Hg concentrations in the mining wastes decreased after reprocessing, the soluble and bioaccessible Hg concentrations increased.Palabras clave: beneficio de patio, jales, reprocesamiento, solubilidad, bioaccesibilidad RESUMENSe estudiaron residuos mineros y suelos de Cedral, San Luis Potosí, México, para evaluar la contaminación por mercurio (Hg) en áreas de amalgamación histórica de plata (Ag) y de reprocesamiento reciente de residuos de amalgamación para la recuperación de Hg y Ag. Se obtuvieron ocho perfiles de hasta 1 m de profundidad de depósitos de 656residuos mineros y nueve de suelo, de los cuales se recolectaron muestras a diferentes profundidades para la determinación de concentraciones totales, solubles y bioaccesibles de Hg. Las concentraciones totales de Hg en residuos mineros variaron entre 8 y 548 mg/kg, mientras que en suelos las concentraciones se presentaron en un rango de entre 1 y 116 mg/kg. Se encontró que el 80 % de las muestras de suelo analizadas superaron el límite máximo permisible de Hg para suelo de uso residencial establecido en la normatividad mexicana, lo que demuestra el severo impacto de la amalgamación y del reprocesamiento de jales de amalgamación en Cedral. Con relación a las concentraciones solubles de Hg, en las muestras de residuos se obtuvieron de 0.009 a 0.32 mg/kg y de 0.003 a 0.02 mg/kg para suelos, lo que representa de 0.007 % a 0.54 % y < 0.03 % del total de Hg contenido en residuos mineros y suelos, respectivamente. Esto indica un bajo potencial de transporte de especies solubles de Hg durante eventos de lluvia. Finalmente, las concentraciones de Hg bioaccesible obtenidas en el estudio (0.1...

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“…No entanto, este aquecimento pode promover perdas por volatilização de quantidades consideráveis de formas de Hg (BLOOM et al, 2003).…”

Section: Resultsunclassified

Comportamento geoquímico do mercúrio (Hg) em solos de manguezais do estado de São Paulo

Oliveira¹

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Selective extractions to assess the biogeochemically relevant fractionation of inorganic mercury in sediments and soils

Cited by 438 publications

References 19 publications

The speciation and bioavailability of mercury in sediments of Haihe River, China

The speciation and bioavailability of mercury in sediments of Haihe River, China

Mercury Pollution Assessment of Mining Wastes and Soils From Former Silver Amalgamation Area in North-Central Mexico

Comportamento geoquímico do mercúrio (Hg) em solos de manguezais do estado de São Paulo

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