Examining Natural Attenuation and Acute Toxicity of Petroleum-Derived Dissolved Organic Matter with Optical Spectroscopy

2018 ◽  
Vol 52 (11) ◽  
pp. 6157-6166 ◽  
Author(s):  
David C. Podgorski ◽  
Phoebe Zito ◽  
Jennifer T. McGuire ◽  
Dalma Martinovic-Weigelt ◽  
Isabelle M. Cozzarelli ◽  
...  
Keyword(s):  
Organic Matter ◽  
Acute Toxicity ◽  
Dissolved Organic Matter ◽  
Optical Spectroscopy ◽  
Natural Attenuation

scholarly journals The Acute Toxicity of Thulium to Hyalella Azteca and the Influence of Toxicity Modifying Factors.

2021 ◽  
Author(s):  
Alexandria Loveridge ◽  
D. Scott Smith ◽  
Jim C. McGeer
Keyword(s):  
Organic Matter ◽  
Rare Earth ◽  
Acute Toxicity ◽  
Dissolved Organic Matter ◽  
Protective Effect ◽  
Environmental Risk ◽  
Hyalella Azteca ◽  
Significant Protection ◽  
Standard Methods ◽  
Modifying Factors

Abstract The demand for rare earth elements (REEs) is growing and as a result, environmental exposure is a concern. The objective of this research was to evaluate the acute toxicity of Tm to Hyalella azteca and to understand the potential for toxicity modification by dissolved organic matter (DOM) and the cations Ca2+, Mg2+ and Na+. Standard methods were followed for 96 h static exposures in a medium with a hardness of 60 mg CaCO3/L, pH of 7.3 at 23°C. H azteca neonates (2-9 d of age) were used and in unmodified media the LC50 concentration was 3.4 µM (95% CI 2.9-3.9 µM; 573 µg/L (482-663)) based on measured dissolved concentrations at the end of the test. Tests done with different concentrations of Ca (0.25, 0.5 and 1.5 mM) did not show consistent trends and there was no clear evidence of a protective effect from Ca. Variations in Na (0.26, 0.5 and 1.6 mM) resulted in no significant changes in toxicity. Similarly, Mg (0.07, 0.14 and 0.4 mM) did not result in significant changes in LC50 values, except for a reduction in toxicity for measured total Tm at the lowest Mg concentration. Our results indicate that Tm toxicity is not influence by cationic competition (Ca, Na and Mg). Dissolved organic matter (sourced from Luther Marsh ON) offered significant protection against Tm toxicity. Additions over 3 mg DOC/L resulted in significantly increased LC50 values. This study contributes toward understanding the toxicity of Tm and the importance of considering dissolved organic matter in estimating the potential for environmental risk of REEs.

Evolution of dissolved organic matter during abiotic oxidation of coal tar—comparison with contaminated soils under natural attenuation

2014 ◽  
Vol 22 (2) ◽  
pp. 1431-1443 ◽  
Author(s):  
Ogier Hanser ◽  
Coralie Biache ◽  
Marine Boulangé ◽  
Stéphane Parant ◽  
Catherine Lorgeoux ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Natural Attenuation ◽  
Contaminated Soils ◽  
Coal Tar ◽  
Abiotic Oxidation

Influence of Dissolved Organic Matter on Acute Toxicity of Zinc to Larval Fathead Minnows (Pimephales promelas)

2006 ◽  
Vol 51 (3) ◽  
pp. 438-444 ◽  
Author(s):  
Robert B. Bringolf ◽  
Brady A. Morris ◽  
Connie J. Boese ◽  
Robert C. Santore ◽  
Herbert E. Allen ◽  
...  
Keyword(s):  
Organic Matter ◽  
Acute Toxicity ◽  
Dissolved Organic Matter ◽  
Pimephales Promelas ◽  
Fathead Minnows
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