Document Detail


Applying biotic ligand models and Bayesian techniques: Ecological risk assessment of copper and nickel in Tokyo rivers.
MedLine Citation:
PMID:  22553119     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Biotic ligand models (BLMs) have been broadly accepted and used in ecological risk assessment of heavy metals for toxicity normalization with respect to water chemistry. However, the importance of assessing bioavailability by using BLMs has not been widely recognized among Japanese stakeholders. Failing to consider bioavailability may result in less effective risk management than would be possible if currently available state-of-the-art methods were used to relate bioavailable concentrations to toxic effects. In this study an ecological risk assessment was conducted using BLMs for six rivers in Tokyo in order to stimulate discussion about bioavailability of heavy metals and the use of BLMs in ecological risk management in Japan. In the risk analysis, a Bayesian approach was used to take advantage of information from previous analyses and to calculate uncertainties in the estimation of risk. Risks were judged to be a concern if the predicted environmental concentration exceeded the 5(th) percentile concentration (HC5) of the species sensitivity distribution. Based on this criterion, risks to stream biota from exposure to copper were judged not to be very severe, but it would be desirable to conduct further monitoring and field surveys to determine whether temporary exposure to concentrations exceeding the HC5 causes any irreversible effects on the river ecosystem. The risk of exposure to nickel was a concern at only one of the six sites. BLM corrections affected these conclusions in the case of copper but were moot in the case of nickel. The use of BLMs in risk assessment calculations for Japanese rivers requires water quality information that is unfortunately not always available. Integr Environ Assess Manag © 2012 SETAC.
Authors:
Takehiko I Hayashi
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-5-2
Journal Detail:
Title:  Integrated environmental assessment and management     Volume:  -     ISSN:  1551-3793     ISO Abbreviation:  -     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-5-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101234521     Medline TA:  Integr Environ Assess Manag     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 SETAC.
Affiliation:
Center for Environmental Risk Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan. hayashi.takehiko@nies.go.jp.
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