7.1.2.4 Derivation of the aquatic predicted no-effect concentration (PNEC).7.1.2.1 Factors influencing aquatic toxicity.6.3.2 Bioaccumulation in sediment-dwelling organisms.6.3.1 Bioaccumulation in aquatic organisms.3.2.3.2 Membrane partitioning coefficients.3.2.3.1 Solids-water, organic carbon-water, and clay distribution coefficients.3.2.2 Water solubility and critical micelle concentration.2.1.2 Analogues used for the human health assessment.2.1.1 Analogues used for the ecological assessment.2.1 Selection of analogues and use of (Q)SAR models.