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Marine sediments are thought of as the final sink compartment for plastic additives and often have the highest concentrations among all compartments. Sources of plastic additives to sediment include leaching from sunken plastic debris into the sediment, partitioning from overlying water or pore water, and settlement of sinking organic material (Figure 2.2). Resuspension of sediment constituents into the water column from bioturbation or currents can transport additives back to the water column (Gallo et al. 2018). Additives with low polarity and high K _oc values likely accumulate in sediment. K _oc values are commonly correlated with hydrophobicity or lipophilic properties, measured by K _ow.