Document of bibliographic reference 128688

BibliographicReference record

Type

Bibliographic resource

Type of document

Journal article

BibLvlCode

AS

Title

Development of a chronic zinc biotic ligand model for Daphnia magna

Abstract

The individual effects of the cations Ca²⁺, Mg²⁺, Na⁺, and H⁺ on the chronic toxicity of Zn to the waterflea Daphnia magna were investigated in different series of univariate experiments, resulting in the development of a chronic Zn biotic ligand model (BLM) for this species. Using the mathematical approach based on a linear relationship between cation activity and metal activity at the EC_x level, the following stability constants for binding of competing cations to the biotic ligand (BL) were derived: log K_CaBL = 3.22, log K_MgBL = 2.69, log K_NaBL = 1.90, and log K_HBL = 5.77. With the derived constants and a log K_ZnBL of 5.31, two different BLMs that predict chronic zinc toxicity (EC50, no observed effect concentration (NOEC)) for D. magna as a function of water characteristics were developed. Fractions of binding sites occupied by Zn at the considered effect levels EC50 and NOEC were 0.127 and 0.084, respectively. The NOEC-based model predicts the Zn toxicity within a factor of 2, while the chronic EC50 could be predicted within a factor of 1.5. In the future, these chronic Zn BLMs for D. magna can improve the ecological relevancy of zinc risk assessments by decreasing the bioavailability-related uncertainty of zinc toxicity.

WebOfScience code

https://www.webofscience.com/wos/woscc/full-record/WOS:000230511100001

Bibliographic citation

Heijerick, D.G.; De Schamphelaere, K.A.C.; Van Sprang, P.A.; Janssen, C.R. (2005). Development of a chronic zinc biotic ligand model for Daphnia magna. Ecotoxicol. Environ. Saf. 62(1): 1-10. https://dx.doi.org/10.1016/j.ecoenv.2005.03.020

Topic

Fresh water

Is peer reviewed

true