USGS Employee At Work
![Image: USGS Employee At Work](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/4-3rd-4-JR-3.jpg?itok=g-nhhc0B)
Detailed Description
Laura Coffey,a chemist at the National Water Quality Laboratory, loads on-line solid-phase extraction cartridges into the high-performance liquid chromatography/mass spectrometer (HPLC/MS) in preparation for testing and calibration
Sources/Usage
Public Domain.