Regular ArticleBiogeochemical Control on the Flux of Trace Elements from Estuarine Sediments: Water Column Oxygen Concentrations and Benthic Infauna
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Removal of phosphate by aluminum-modified clay in a heavily polluted lake, Southwest China: Effectiveness and ecological risks
2020, Science of the Total EnvironmentCitation Excerpt :According to Environmental Quality Standards for Surface Water (CEPA, 2002), the CODMn in the water of passivation area belonged to Class III of the China National Water Quality Standard, confirming favorable remediation effect of the passivation project on organic pollution. DO plays an important role in lake aquatic ecosystem and the circulation of materials and is also a key factor that affects the metabolism of aquatic organisms (Riedel et al., 1997). DO directly determines the distribution and biomasses of aquatic communities.
The mismatch between bioaccumulation in field and laboratory environments: Interpreting the differences for metals in benthic bivalves
2015, Environmental PollutionCitation Excerpt :Aquatic organisms obtain nutrition from both the dissolved and particulate phases of the environment, utilising both passive uptake and active ingestion (Rainbow, 2007). For benthic organisms, ingestion processes, establishing/maintaining habitats (e.g., burrowing) and irrigation of such habitats often cause sediment bioturbation, a process which alters sediment substrata by perturbing redox stratification, porewater equilibria and increases oxidation of metal-binding phases such as acid-volatile sulfide (AVS) (Riedel et al., 1997; Simpson and Batley, 2003; Atkinson et al., 2007; Simpson et al., 2012). These activities influence contaminant bioavailability from the perspective of both chemical (contaminant partitioning and speciation) and biological exposures (organisms burrowing and feeding behaviour) (Ciutat and Boudou, 2003; Atkinson et al., 2007; Simpson et al., 2012).
Measuring hypoxia induced metal release from highly contaminated estuarine sediments during a 40day laboratory incubation experiment
2012, Science of the Total EnvironmentCitation Excerpt :If the host phase is destroyed in dissolution reactions then the adsorbed or incorporated metals are released (Santschi et al., 1990). During hypoxic episodes the removal of O2 leads to a reduction in sediment redox potential and the sequential reduction of nitrate, then Mn and Fe oxy-hydroxides, with the latter resulting in the substantial release of formerly sequestered metals to the water column (Eggleton and Thomas, 2004; Riedel et al., 1997; Santschi et al., 1990). In extended O2 depletion events, sediments may become anoxic with sulphate reduction to sulphide occurring (Burdige, 2006).