Report of the Board of Review for Decamethylcyclopentasiloxane (Siloxane D5)

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Preface

1 Terms and Abbreviations Used in this Report

2 Executive Summary

• Conclusions of the Board of Review
• Scope of the Mandate of the Board of Review
• Fate of Siloxane D5 in the Environment
• Exposure of Organisms in the Environment
• Bioaccumulation in Organisms
• Toxicity of Siloxane D5
• Risk Assessment

3 Statement of Reasons of the Siloxane D5 Board of Review

• 3.1 Introduction and Background
• 3.2 Procedural Steps in the Board of Review Process
• 3.3 Determination of Scope of the Board’s Mandate
• 3.4 Relevant Legislation and Regulations
• 3.5 Framing the Board’s Mandate
  • 3.5.1 Positions of the Parties
    • 3.5.1.1 The Meaning of “Danger” to the Environment
    • 3.5.1.2 Persistence and Bioaccumulation Regulations
    • 3.5.1.3 The Role of Precaution in This Review

4 The Nature, Use, Distribution, Concentrations, and Toxicity of Siloxane D5

• 4.1 Use and Release of Siloxane D5 in the Canadian Environment
• 4.2 Distribution and Persistence of Siloxane D5 in the Environment
  • 4.2.1 Use of Models and Tools for Assessing Environmental Fate and Distribution of Siloxane D5
  • 4.2.2 Air
    • 4.2.2.1 Processes Affecting Fate and Distribution in Air
    • 4.2.2.2 Concentrations in Air
  • 4.2.3 Water
    • 4.2.3.1 Processes Affecting Fate and Distribution in Water
    • 4.2.3.2 Concentrations in Water
  • 4.2.4 Sediments
    • 4.2.4.1 Processes Affecting Fate and Distribution in Sediments
    • 4.2.4.2 Concentrations in Sediments
  • 4.2.5 Soils
    • 4.2.5.1 Processes Affecting Fate and Distribution in Soils
    • 4.2.5.2 Concentrations in Soils
• 4.3 Persistence, Bioaccumulation and Trophic Magnification of Siloxane D5 in the Environment
  • 4.3.1 Persistence
  • 4.3.2 Accumulation
    • 4.3.2.1 Bioaccumulation Factor
    • 4.3.2.2 Bioconcentration Factor
    • 4.3.2.3 Biota-sediment Accumulation Factor
    • 4.3.2.4 Biomagnification Factor
    • 4.3.2.5 Trophic Magnification Factor
    • 4.3.2.6 Depuration Rates
    • 4.3.2.7 Fugacity Analysis
  • 4.3.3 Conclusions on Persistence, Bioaccumulation and Trophic Magnification of Siloxane D5 in the Environment
• 4.4 Toxicity of Siloxane D5 to Receptor Organisms in the Environment
  • 4.4.1 Terrestrial Animals
  • 4.4.2 Terrestrial Plants
  • 4.4.3 Aquatic Organisms
  • 4.4.4 Sediment-dwelling Organisms
  • 4.4.5 Conclusions on Toxicity of Siloxane D5 to Receptor Organisms in the Environment

5 Assessment of the Nature and Extent of the Danger to the Environment Posed by Siloxane D5

• 5.1 Danger to Terrestrial Animals and Plants
• 5.2 Danger to Aquatic Organisms
• 5.3 Danger to Sediment-dwelling Organisms
• 5.4 Conclusions on the Nature and Extent of the Danger of Siloxane D5 to the Environment

6 Conclusions of the Board of the Review

7 Costs

8 Strengths and Uncertainties

9 Observations and Recommendations

• 9.1 Persistence and Bioaccumulation Regulations
• 9.2 Availability and Transparency of the Models
• 9.3 Conduct of Screening Assessments

10 References

Appendices

• A. Ministerial Notice Establishing the Board
• B. Letter to the Minister of the Environment Extending the Deadline for the Board’s Report
• C. Letter from the Minister of the Environment received August 30, 2011
• D. The Board’s Interpretation of its Mandate