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内容説明 The definitive reference on ecological risk assessment (ERA)， this second edition details advances in science and practice since 1992. Reorganized to present a unified process of ERA that is applicable to various problems， scales， and mandates， the book provides clear， scientifically sound， and unbiased technical advice on the risks from chemicals and chemical mixtures. Coverage now includes more discussion on applying ERA to stressors other than chemical contaminants.