Figure 2.

Relationship between calculated POCIS-based time-weighted average (TWA) water concentrations of polar organic pollutants and dissolved concentrations measured in grab samples taken at POCIS deployment (•) and retrieval (Δ) for Coyote Creek (A), Napa River (B), and San Leandro Bay (C). POCIS accumulated organic contaminant burdens were converted to a time-weighted average (TWA) concentration (ng L⁻¹) using sampling rates from the literature, as described in the text. A table of these sampling rates can be found in Supplementary Information (Table SI-3). Dashed lines represent a hypothetical 1:1 relationship.