Passive sampler retrieval
![Upon retrieval, the previously white membranes of the sampler are coated with brown buildup](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/media/images/PXL_20230703_225650044.jpg?itok=PAzm06u2)
Detailed Description
Retrieving a Solid Phase Adsorption Toxin Tracking (SPATT) sampler from the Columbia River. Passive samplers like this one are left in the river to accumulate toxins over time for later analysis.
Sources/Usage
Public Domain.