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A Small-Scale Setup for Algal Toxicity Testing of Nanomaterials and Other Difficult Substances

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Biological toxicity of lanthanide elements on algae.

Peidong Tai¹, Qing Zhao, Dan Su

¹Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China.

|June 16, 2010

Summary

Lanthanide toxicity on marine algae was studied. Results show all lanthanides similarly inhibit algae growth, regardless of natural abundance, suggesting algae cannot differentiate between these elements.

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Area of Science:

Marine Biology
Environmental Toxicology
Inorganic Chemistry

Background:

Lanthanides are rare earth elements with increasing environmental presence.
Understanding their ecotoxicity is crucial for marine ecosystem health.
Monocellular algae form the base of marine food webs and are sensitive indicators of water quality.

Purpose of the Study:

To investigate the biological toxicity of individual and mixed lanthanides on marine monocellular algae.
To determine the relationship between lanthanide seawater abundance and their toxicity.
To assess the applicability of existing toxicity rules (e.g., Harkins rule) to lanthanides.

Main Methods:

Exposure of Skeletonema costatum to varying concentrations of 13 individual lanthanide elements.
Assessment of growth inhibition using 96-hour EC50 (Effective Concentration causing 50% inhibition).
Comparison of toxicity data with natural abundance of lanthanides and evaluation against the Harkins rule.

Main Results:

All tested lanthanides exhibited similar toxic effects on Skeletonema costatum.
A concentration of approximately 29.04 µmol L⁻¹ of any single lanthanide caused a 50% reduction in algal growth after 96 hours.
Lanthanide toxicity was not correlated with their natural abundance, and the Harkins rule was not applicable.
A mixture of lanthanides had an equivalent inhibitory effect to individual lanthanides at the same total concentration.

Conclusions:

The biological toxicity of lanthanides on marine monocellular algae is element-independent.
Monocellular algae appear unable to distinguish between chemically similar lanthanide elements.
This suggests a non-specific toxicity mechanism for lanthanides in these organisms.