Journal ArticleDOI
Why Is Metal Bioaccumulation So Variable? Biodynamics as a Unifying Concept
TLDR
It is suggested that a biologically based conceptualization, the biodynamic model, provides the necessary unification for a key aspect in risk: metal bioaccumulation (internal exposure).Abstract:
Ecological risks from metal contaminants are difficult to document because responses differ among species, threats differ among metals, and environmental influences are complex. Unifying concepts are needed to better tie together such complexities. Here we suggest that a biologically based conceptualization, the biodynamic model, provides the necessary unification for a key aspect in risk: metal bioaccumulation (internal exposure). The model is mechanistically based, but empirically considers geochemical influences, biological differences, and differences among metals. Forecasts from the model agree closely with observations from nature, validating its basic assumptions. The biodynamic metal bioaccumulation model combines targeted, high-quality geochemical analyses from a site of interest with parametrization of key physiological constants for a species from that site. The physiological parameters include metal influx rates from water, influx rates from food, rate constants of loss, and growth rates (whe...read more
Citations
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Silver nanoparticles: behaviour and effects in the aquatic environment.
TL;DR: The ecotoxicological literature shows that concentrations of Ag NPs below the current and future PECs, as low as just a few ng L(-1), can affect prokaryotes, invertebrates and fish indicating a significant potential, though poorly characterised, risk to the environment.
Journal ArticleDOI
Trace metal bioaccumulation: models, metabolic availability and toxicity.
TL;DR: The biodynamic model of trace metal bioaccumulation allows the prediction and explanation of widely differing accumulated trace metal concentrations in organisms, combining geochemical analyses of environmental metal concentrations with the measurement of key physiological parameters for a species from the site under consideration.
Journal ArticleDOI
Framework for metals risk assessment.
TL;DR: The Framework for Metals Risk Assessment is a science-based document that describes basic principles that address the special attributes and behaviors of metals and metal compounds to be considered when assessing their human health and ecological risks.
Journal ArticleDOI
Effects of sediment geochemical properties on heavy metal bioavailability.
Chang Zhang,Zhigang Yu,Guangming Zeng,Min Jiang,Zhongzhu Yang,Fang Cui,Meng-ying Zhu,Liu-qing Shen,Liang Hu +8 more
TL;DR: The mechanisms of sediment properties such as acid-volatile sulfides, organic matter, texture and geology, organism behaviors as well as those influencing the bioavailability of metals were analyzed and it is expected that some novel synthetic materials like polysulfides, nano-materials, provide the substantial amendments for metals pollution in sediment.
Journal ArticleDOI
Long-term sorption of metals is similar among plastic types: implications for plastic debris in aquatic environments.
TL;DR: Overall, this work shows that a complex mixture of metals, including those listed as priority pollutants by the US EPA (Cd, Ni, Zn and Pb), can be found on plastic debris composed of various plastic types.
References
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Journal ArticleDOI
Trace metal concentrations in aquatic invertebrates: why and so what?
TL;DR: The significance of accumulated metal concentrations is discussed in terms of the biological significance, including the attempted recognition of a high or low concentration, and of the applied use of aquatic invertebrates in biomonitoring programmes assessing geographical and temporal variation in trace metal bioavailabilities in aquatic systems.
The relationship between cupric ion activity and the toxicity of copper to phytoplankton [Thalassiosira pseudonana, Nannochloris atomus, Algae]
W. Sunda,R.R.L. Guillard +1 more
TL;DR: The relationship between growth rate inhibition and cupric ion activity was not a simple hyperbolic function as discussed by the authors, but rather a complex function, and it was shown that the relationship was not due to a simple linear function.
Journal ArticleDOI
Biotic Ligand Model, a Flexible Tool for Developing Site-Specific Water Quality Guidelines for Metals
Soumya Niyogi,Chris M. Wood +1 more
TL;DR: The biotic ligand model is critically evaluated for copper, silver, zinc, and nickel and gill binding approaches for cadmium, lead, and cobalt on which BLMs could be based and issues of concern include the arbitrary nature of LA50 adjustments.