Tags

Type your tag names separated by a space and hit enter

Development and validation of a metal mixture bioavailability model (MMBM) to predict chronic toxicity of Ni-Zn-Pb mixtures to Ceriodaphnia dubia.
Environ Pollut. 2017 Jan; 220(Pt B):1271-1281.EP

Abstract

Recently, several bioavailability-based models have been shown to predict acute metal mixture toxicity with reasonable accuracy. However, the application of such models to chronic mixture toxicity is less well established. Therefore, we developed in the present study a chronic metal mixture bioavailability model (MMBM) by combining the existing chronic daphnid bioavailability models for Ni, Zn, and Pb with the independent action (IA) model, assuming strict non-interaction between the metals for binding at the metal-specific biotic ligand sites. To evaluate the predictive capacity of the MMBM, chronic (7d) reproductive toxicity of Ni-Zn-Pb mixtures to Ceriodaphnia dubia was investigated in four different natural waters (pH range: 7-8; Ca range: 1-2 mM; Dissolved Organic Carbon range: 5-12 mg/L). In each water, mixture toxicity was investigated at equitoxic metal concentration ratios as well as at environmental (i.e. realistic) metal concentration ratios. Statistical analysis of mixture effects revealed that observed interactive effects depended on the metal concentration ratio investigated when evaluated relative to the concentration addition (CA) model, but not when evaluated relative to the IA model. This indicates that interactive effects observed in an equitoxic experimental design cannot always be simply extrapolated to environmentally realistic exposure situations. Generally, the IA model predicted Ni-Zn-Pb mixture toxicity more accurately than the CA model. Overall, the MMBM predicted Ni-Zn-Pb mixture toxicity (expressed as % reproductive inhibition relative to a control) in 85% of the treatments with less than 20% error. Moreover, the MMBM predicted chronic toxicity of the ternary Ni-Zn-Pb mixture at least equally accurately as the toxicity of the individual metal treatments (RMSEMix = 16; RMSEZn only = 18; RMSENi only = 17; RMSEPb only = 23). Based on the present study, we believe MMBMs can be a promising tool to account for the effects of water chemistry on metal mixture toxicity during chronic exposure and could be used in metal risk assessment frameworks.

Authors+Show Affiliations

Faculty of Bioscience Engineering, GhenToxLab, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium. Electronic address: chnys.nys@ugent.be.Faculty of Bioscience Engineering, GhenToxLab, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium. Electronic address: colin.janssen@ugent.be.Faculty of Bioscience Engineering, GhenToxLab, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium. Electronic address: karel.deschamphelaere@ugent.be.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

27838063

Citation

Nys, Charlotte, et al. "Development and Validation of a Metal Mixture Bioavailability Model (MMBM) to Predict Chronic Toxicity of Ni-Zn-Pb Mixtures to Ceriodaphnia Dubia." Environmental Pollution (Barking, Essex : 1987), vol. 220, no. Pt B, 2017, pp. 1271-1281.
Nys C, Janssen CR, De Schamphelaere KAC. Development and validation of a metal mixture bioavailability model (MMBM) to predict chronic toxicity of Ni-Zn-Pb mixtures to Ceriodaphnia dubia. Environ Pollut. 2017;220(Pt B):1271-1281.
Nys, C., Janssen, C. R., & De Schamphelaere, K. A. C. (2017). Development and validation of a metal mixture bioavailability model (MMBM) to predict chronic toxicity of Ni-Zn-Pb mixtures to Ceriodaphnia dubia. Environmental Pollution (Barking, Essex : 1987), 220(Pt B), 1271-1281. https://doi.org/10.1016/j.envpol.2016.10.104
Nys C, Janssen CR, De Schamphelaere KAC. Development and Validation of a Metal Mixture Bioavailability Model (MMBM) to Predict Chronic Toxicity of Ni-Zn-Pb Mixtures to Ceriodaphnia Dubia. Environ Pollut. 2017;220(Pt B):1271-1281. PubMed PMID: 27838063.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Development and validation of a metal mixture bioavailability model (MMBM) to predict chronic toxicity of Ni-Zn-Pb mixtures to Ceriodaphnia dubia. AU - Nys,Charlotte, AU - Janssen,Colin R, AU - De Schamphelaere,Karel A C, Y1 - 2016/11/09/ PY - 2016/07/12/received PY - 2016/09/30/revised PY - 2016/10/17/accepted PY - 2016/11/14/pubmed PY - 2017/2/28/medline PY - 2016/11/14/entrez KW - Biotic ligand model KW - Freshwater KW - Metals KW - Mixture toxicity KW - Risk assessment SP - 1271 EP - 1281 JF - Environmental pollution (Barking, Essex : 1987) JO - Environ Pollut VL - 220 IS - Pt B N2 - Recently, several bioavailability-based models have been shown to predict acute metal mixture toxicity with reasonable accuracy. However, the application of such models to chronic mixture toxicity is less well established. Therefore, we developed in the present study a chronic metal mixture bioavailability model (MMBM) by combining the existing chronic daphnid bioavailability models for Ni, Zn, and Pb with the independent action (IA) model, assuming strict non-interaction between the metals for binding at the metal-specific biotic ligand sites. To evaluate the predictive capacity of the MMBM, chronic (7d) reproductive toxicity of Ni-Zn-Pb mixtures to Ceriodaphnia dubia was investigated in four different natural waters (pH range: 7-8; Ca range: 1-2 mM; Dissolved Organic Carbon range: 5-12 mg/L). In each water, mixture toxicity was investigated at equitoxic metal concentration ratios as well as at environmental (i.e. realistic) metal concentration ratios. Statistical analysis of mixture effects revealed that observed interactive effects depended on the metal concentration ratio investigated when evaluated relative to the concentration addition (CA) model, but not when evaluated relative to the IA model. This indicates that interactive effects observed in an equitoxic experimental design cannot always be simply extrapolated to environmentally realistic exposure situations. Generally, the IA model predicted Ni-Zn-Pb mixture toxicity more accurately than the CA model. Overall, the MMBM predicted Ni-Zn-Pb mixture toxicity (expressed as % reproductive inhibition relative to a control) in 85% of the treatments with less than 20% error. Moreover, the MMBM predicted chronic toxicity of the ternary Ni-Zn-Pb mixture at least equally accurately as the toxicity of the individual metal treatments (RMSEMix = 16; RMSEZn only = 18; RMSENi only = 17; RMSEPb only = 23). Based on the present study, we believe MMBMs can be a promising tool to account for the effects of water chemistry on metal mixture toxicity during chronic exposure and could be used in metal risk assessment frameworks. SN - 1873-6424 UR - https://www.unboundmedicine.com/medline/citation/27838063/Development_and_validation_of_a_metal_mixture_bioavailability_model__MMBM__to_predict_chronic_toxicity_of_Ni_Zn_Pb_mixtures_to_Ceriodaphnia_dubia_ DB - PRIME DP - Unbound Medicine ER -