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Uranium toxicity and speciation during chronic exposure to the tropical freshwater fish, Mogurnda mogurnda.
Chemosphere. 2010 Apr; 79(5):547-54.C

Abstract

The effects of chronic uranium (U) exposure on larval Northern trout gudgeon, Mogurnda mogurnda, were assessed in two experiments using a newly-developed 28d survival and growth toxicity test. Significant effects were observed in both tests, but toxicity was markedly higher in Test 2 than Test 1. The LC50s for Tests 1 and 2 were 2090microgL(-1) and 1070microgL(-1), respectively. Larval growth IC10s for Tests 1 and 2 were 860microgL(-1) and 660microgL(-1) (dry weight), and 1160microgL(-1) and 850microgL(-1) (length), respectively. Uranium speciation modelling showed that a lower pH in Test 2 (mean of 6.0) compared to Test 1 (mean of 6.7) resulted in a greater proportion of free uranyl ion (UO(2)(2+)), the predominant bioavailable form of U. A higher dissolved organic carbon concentration (DOC) in Test 2 (4.2mgL(-1)) compared to Test 1 (2.1mgL(-1)) resulted in a higher proportion of U-DOC in Test 2, but this was insufficient to counter the effect of pH on the proportion of UO(2)(2+). The difference in U toxicity between the two tests could be explained by normalising for UO(2)(2+); the concentrations of UO(2)(2+) at the LC50s for Tests 1 and 2 were calculated to be 13.3 and 13.7microgL(-1), respectively. Finally, the results of this study, and comparisons with other studies suggest that U toxicity to M. mogurnda appears to be as much, if not more, a function of exposure water quality and feeding regime, as exposure duration.

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Authors+Show Affiliations

Cheng KL
Ecotoxicology Program, Environmental Research Institute of the Supervising Scientist, GPO Box 461, Darwin, Northern Territory 0801, Australia.
Hogan AC
No affiliation info available
Parry DL
No affiliation info available
Markich SJ
No affiliation info available
Harford AJ
No affiliation info available
van Dam RA
No affiliation info available

MeSH

AnimalsEnvironmental ExposureHydrogen-Ion ConcentrationLarvaPerciformesTime FactorsUraniumWater Pollutants, Radioactive

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

20219234

Citation

Cheng, K L., et al. "Uranium Toxicity and Speciation During Chronic Exposure to the Tropical Freshwater Fish, Mogurnda Mogurnda." Chemosphere, vol. 79, no. 5, 2010, pp. 547-54.
Cheng KL, Hogan AC, Parry DL, et al. Uranium toxicity and speciation during chronic exposure to the tropical freshwater fish, Mogurnda mogurnda. Chemosphere. 2010;79(5):547-54.
Cheng, K. L., Hogan, A. C., Parry, D. L., Markich, S. J., Harford, A. J., & van Dam, R. A. (2010). Uranium toxicity and speciation during chronic exposure to the tropical freshwater fish, Mogurnda mogurnda. Chemosphere, 79(5), 547-54. https://doi.org/10.1016/j.chemosphere.2010.02.017
Cheng KL, et al. Uranium Toxicity and Speciation During Chronic Exposure to the Tropical Freshwater Fish, Mogurnda Mogurnda. Chemosphere. 2010;79(5):547-54. PubMed PMID: 20219234.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Uranium toxicity and speciation during chronic exposure to the tropical freshwater fish, Mogurnda mogurnda. AU - Cheng,K L, AU - Hogan,A C, AU - Parry,D L, AU - Markich,S J, AU - Harford,A J, AU - van Dam,R A, Y1 - 2010/03/09/ PY - 2009/11/04/received PY - 2010/02/03/revised PY - 2010/02/07/accepted PY - 2010/3/12/entrez PY - 2010/3/12/pubmed PY - 2010/6/12/medline SP - 547 EP - 54 JF - Chemosphere JO - Chemosphere VL - 79 IS - 5 N2 - The effects of chronic uranium (U) exposure on larval Northern trout gudgeon, Mogurnda mogurnda, were assessed in two experiments using a newly-developed 28d survival and growth toxicity test. Significant effects were observed in both tests, but toxicity was markedly higher in Test 2 than Test 1. The LC50s for Tests 1 and 2 were 2090microgL(-1) and 1070microgL(-1), respectively. Larval growth IC10s for Tests 1 and 2 were 860microgL(-1) and 660microgL(-1) (dry weight), and 1160microgL(-1) and 850microgL(-1) (length), respectively. Uranium speciation modelling showed that a lower pH in Test 2 (mean of 6.0) compared to Test 1 (mean of 6.7) resulted in a greater proportion of free uranyl ion (UO(2)(2+)), the predominant bioavailable form of U. A higher dissolved organic carbon concentration (DOC) in Test 2 (4.2mgL(-1)) compared to Test 1 (2.1mgL(-1)) resulted in a higher proportion of U-DOC in Test 2, but this was insufficient to counter the effect of pH on the proportion of UO(2)(2+). The difference in U toxicity between the two tests could be explained by normalising for UO(2)(2+); the concentrations of UO(2)(2+) at the LC50s for Tests 1 and 2 were calculated to be 13.3 and 13.7microgL(-1), respectively. Finally, the results of this study, and comparisons with other studies suggest that U toxicity to M. mogurnda appears to be as much, if not more, a function of exposure water quality and feeding regime, as exposure duration. SN - 1879-1298 UR - https://www.unboundmedicine.com/medline/citation/20219234/Uranium_toxicity_and_speciation_during_chronic_exposure_to_the_tropical_freshwater_fish_Mogurnda_mogurnda_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0045-6535(10)00163-3 DB - PRIME DP - Unbound Medicine ER -