Anaerobic sediment potential acidification and metal release risk assessment by chemical characterization and batch resuspension experiments

Nanno, María Pía Di; Curutchet, Gustavo; Ratto, Silvia

doi:10.1065/jss2007.04.220

Cited by 25 publications

(26 citation statements)

References 24 publications

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“…In polluted anaerobic sediments, microbiologically catalyzed sulfate reduction originates in sulfides (acid-volatile sulfide, AVS) and redox potential changes can promote sediment acidification by oxidation of sulfide to sulfate where about 0.3 to 3.0 pH in sediment decreased (Di Nanno et al 2007). Ionizable organic contaminants (IOCs) like ibuprofen exist in aqueous phase as ionic forms and/or neutral forms.…”

Section: Introductionmentioning

confidence: 99%

Effects of pH, dissolved organic matter, and salinity on ibuprofen sorption on sediment

Oh¹,

Shin

Kim

2016

Environ Sci Pollut Res

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Ibuprofen is well known as one of the most frequently detected pharmaceuticals and personal care products (PPCPs) in rivers. However, sorption of ibuprofen onto sediment has not been considered in spite of its high K ow (3.5). In this study, the effects of various environmental conditions such as pH (4, 5.3, and 7), the concentrations of dissolved organic matters (0 to 1.0 mM citrate and urea), salinity (0, 10, 20, and 30 part per thousand), and presence of other PPCP (salicylic acid) on ibuprofen sorption were investigated. Linear model mainly fitted the experimental data for analysis. The distribution coefficient (K d) in the linear model decreased from 6.76 at pH 4 to near zero at pH 7, indicating that neutral form of ibuprofen at pH below pKa (5.2) was easily sorbed onto the sediment whereas the sorption of anionic form at pH over pKa was not favorable. To investigate the effect of dissolved organic matters (DOMs) on ibuprofen sorption, citrate and urea were used as DOMs. As citrate concentration increased, the K d value decreased but urea did not interrupt the ibuprofen sorption. Citrate has three carboxyl functional groups which can attach easily ibuprofen and hinder its sorption onto sediment. Salinity also affected ibuprofen sorption due to decrease of the solubility of ibuprofen as salinity increased. In competitive sorption experiment, the addition of salicylic acid also led to enhance ibuprofen sorption. Conclusively, ibuprofen can be more easily sorbed onto the acidified sediments of river downstream, especially estuaries or near-shore environment with low DOM concentration.

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Section: Introductionmentioning

confidence: 99%

Effects of pH, dissolved organic matter, and salinity on ibuprofen sorption on sediment

Oh¹,

Shin

Kim

2016

Environ Sci Pollut Res

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“…During sediment oxidation, metals bound to sulfides and organic phase are released rapidly to the water column, accompanied by the pH decrease (Figure ). Previous studies have noted that sediment oxidation can potentially cause acidification, and can lead to significant amounts of toxic metal release . The pH decrease during the first week of sediment oxidation shows fast acidification in all sediment samples.…”

Section: Discussionmentioning

confidence: 66%

“…Following the oxidation of sediment samples, the sulfate release in the water column accompanied microbial oxidation of reduced sulfidic minerals, primarily pyrrhotite (FeS; Equation 2) and pyrite (FeS 2 ; Equation ), commonly found in mining waste materials as sedimentary iron sulfides . The resulting solution of sulfate characterized by a slightly yellowish brown color, colloidal suspensions, is an indication that iron (III) oxyhydroxysulfate mineral jarosite precipitation (Equation 4) is formed as a secondary sulfate mineral .…”

Section: Discussionmentioning

confidence: 99%

“…In aquifer mining, heavy metals are intimately tied to the flux of sediments . In this case, however, sediments function as an environmental sink for metal speciation , and thus knowledge of chemically active forms of metals in surface water‐bottom sediments is fundamental to an understanding of the hydrogeochemical processes controlling the long‐term residence of particulate‐phase metals in contaminated sediments.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, as redox conditions affect metal speciation, it also affects the dissolved constituents and their solubility and thus provides a strong base for determining the solubility behavior of particulate‐phase metals (dissolved metal concentrations) in a sedimentary basin . Moreover, changes in redox potential conditions promote several oxidation–reduction reactions, and such a change in polluted anoxic sediments creates a favorable condition for oxidation, with consequent acidification and potential toxic metal release . Therefore, oxidized conditions limit lake sediments in their capacity to retain heavy metals .…”

Section: Introductionmentioning

confidence: 99%

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Geochemical control processes and potential sediment toxicity in a mine‐impacted lake

Adeleke

Svensson

Yekta

et al. 2016

Enviro Toxic and Chemistry

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Geochemical parameters and major ion concentrations from sediments of a freshwater lake in the town of Åtvidaberg, southeastern, Sweden, were used to identify the geochemical processes that control the water chemistry. The lake sediments are anoxic, characterized by reduced sulfur and sulfidic minerals. The hypothesis tested is that in sulfidic-anaerobic contaminated sediments, the presence of redox potential changes creates a favorable condition for sulfide oxidation, resulting in the release of potentially toxic metals. The acid volatile sulfide (AVS) contents ranged from 5.5 μmol/g to 16 μmol/g of dry sediment. Comparison of total mine tailing metals (∑mine tailing metals) with simultaneously extracted metals (SEM) in sediments indicates that up to 20% of the ∑mine tailing metals are bound to the solid phase as AVS. Consequently, the AVS and SEM analysis classified all sediment samples as potentially toxic in terms of heavy metal concentrations (i.e., SEM to AVS ratio distribution > 1). Evaluation of hydrogeochemical data suggests that calcite dissolution, iron (III) oxyhydroxysulfate mineral jarosite (H-jarosite) precipitation, hematite precipitation, and siderite precipitation are the most prevailing geochemical processes that control the geochemical interactions between the water column and sediment in a mine-impacted lake. The geochemical processes were verified and quantified using a chemical equilibrium modeling program, Visual MINTEQ, Ver 3.1, beta. The identified geochemical processes create an environment in which the characteristics of sulfate-rich waters and acidic-iron produce the geochemical conditions for acid mine drainage and mobilization of toxic metals.

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Bioaccessible heavy metals‐sediment particles from Reconquista River induce lung inflammation in mice

Ferraro

Curutchet

Tasat

2012

Enviro Toxic and Chemistry

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The Reconquista River (RR), one of the most polluted watercourses in Argentina, receives effluent discharges from heavily industrialized and highly populated settlements. During winter and summer, the floodplain remains dry, producing the oxidation of sulfide and organic matter present in the sediment, making heavy metals more bioaccessible. Dispersion of this sediment occurs, and thus harmful effects on the pulmonary health of residents and workers inhabiting the RR bank may take place. The authors characterized the sediment particles of the RR (RR-PM) morphologically by scanning electron microscopy and its elemental composition by energy dispersive X-ray spectroscopy (EDX) and Community Bureau of Reference (BCR) sequential extraction. Furthermore, the authors evaluated its biological impact on the respiratory system of BALB/c mice, generating four groups: control healthy, sensibilized with ovalbumin, exposed to particles, and sensibilized and exposed to particles. Sediment particles of the Reconquista River contained fine particulate matter, with a high concentration of bioaccessible Cu and Zn. The authors found that animal exposure to RR-PM caused polymorphonuclear cell lung infiltration, augmentation of O2(-), increase of proinflammatory cytokines (tumor necrosis factor alpha [TNFα], interleukin-6 [IL-6]) and apoptosis. This adverse response was more dramatic in the sensibilized and exposed to particles group. Even more, they proved the bioaccessible fraction present in the RR-PM to be responsible for these harmful effects. The authors conclude that RR-PM produces an adverse biological impact on the airways of healthy animals, which is largely aggravated in previously sensibilized animals.

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Anaerobic sediment potential acidification and metal release risk assessment by chemical characterization and batch resuspension experiments

Cited by 25 publications

References 24 publications

Effects of pH, dissolved organic matter, and salinity on ibuprofen sorption on sediment

Effects of pH, dissolved organic matter, and salinity on ibuprofen sorption on sediment

Geochemical control processes and potential sediment toxicity in a mine‐impacted lake

Bioaccessible heavy metals‐sediment particles from Reconquista River induce lung inflammation in mice

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