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The effect of true water hardness and alkalinity on the toxicity of Cu and U to two tropical Australian freshwater organisms

Details:

Title

The effect of true water hardness and alkalinity on the toxicity of Cu and U to two tropical Australian freshwater organisms

Creator

Riethmuller, N.

Collection

E-Publications; E-Books; PublicationNT; Internal Report 348

Date

2001

Description

Made available via the Publications (Legal Deposit) Act 2004 (NT).

Notes

Date:2001-01

Language

English

Series

Internal Report 348

File type

application/pdf.

Copyright owner

Check within Publication or with content Publisher.

Parent handle

https://hdl.handle.net/10070/230292

Citation address

https://hdl.handle.net/10070/671207

Page content

Controversy surrounds the effect hydrophilic organic ligands exert on the toxicity and bioavailability of U in aquatic systems. Uranium toxicity was found to decrease in the presence of organic ligands (model fulvic acid), by complexing cationic uranyl species (eg. UO:2+ and U020H+) (Yong and Macaskie. 1995: Markich et al., 1996). In contrast, the complexation of uranyl with oxalate ([U02(Ox)cF) was found to enhance U toxicity to a lichen, Cladonia rcmgiferina (Boileau er al., 1985). 1.4 Aim of study The aim of this study was to separate the effects of tlUe water hardness (el and Mg) and alblinity (c:1rbonate), ar a comjtant pH. on the toxicity of Cu and U to H. viri(iissilll(i (Green hydra. popUlation growth) and M. l11og11rnda (Purple-spotted gudgeon, sac-fry survival). This study also attempted to investigate the effects of pH (proton concentration), at constant hardness and alkalinity, on the toxicity of Cll and U to H. viridissima and /'vi. mogurnda (Refer to Appendix E for details). Gaining a fundamental understanding of how these parameters affect metal toxicity and bioavailability is an essential aspect of site-specific environmental risk assessment and water quality guideline derivation. :20


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