Journal
HUMAN AND ECOLOGICAL RISK ASSESSMENT
Volume 15, Issue 6, Pages 1257-1272Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/10807030903304922
Keywords
mixture toxicity; chemical regulation; REACH; Water Framework Directive; concentration addition
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This review seeks to connect the scientific theory of mixture toxicity to its implementation within different regulatory frameworks. The aim is to demonstrate how mixture toxicity assessment can be more thoroughly integrated into the European chemical regulations, REACH, and the Water Framework Directive (WFD), using the experiences gained through other regulatory frameworks. The article consists of (1) an examination of the scientific underpinnings of the common mixture toxicity assessment methods; (2) a discussion of how these methods have been used in regulatory frameworks; and (3) a discussion of how the methods could be applied within REACH and the WFD. It is concluded that concentration addition should be applied as a default model for mixture toxicity assessment. Furthermore, it is concluded that REACH and the WFD only include mixture toxicity assessments in specific situations. However, it is shown that it is scientifically feasible and regulatorally practicable to integrate a more holistic mixture toxicity approach into both legislations. In this connection, the experience gained from the U. S. frameworks on mixture toxicity assessment could be useful. The construction of a database that includes data on chemicals in the European environment could be used for mixture toxicity assessment of the chemicals with individual PEC/PNECs > 0.1.
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