A scuba diver deploys a semipermeable membrane device

Detailed Description
Passive Sampling Research—Columbia, Missouri. A scuba diver deploys a semipermeable membrane device (SPMD) passive sampler at St. John, U.S. Virgin Islands. U.S. Geological Survey (USGS) scientists used SPMDs to investigate potential contaminant exposure to coral reefs.
Sources/Usage
Public Domain.