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Figure S1. A typical porewater peeper design (modified from Tessier et al. (1994)). Other styles of peepers are illustrated in Davison et al. (2000).

Figure S2. Illustration of DGT operation (modified from Zhang and Davison (1995)). C is the concentration of the external waters. Δg is the thickness of the diffusive layer path (including the membrane).

Figure S3. Configuration of the DGT device use for sediment deployments (modified from Harper et al. (1999)). This device is also used for unconstrained DET deployments (without inclusion of a binding gel).

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