USGS - science for a changing world

Environmental Health - Toxic Substances

Crosscutting Topics


Field and laboratory environmental measurement methods

The U.S. Geological Survey (USGS) Toxic Substances Hydrology Program develops field methods to measure a wide range of environmental properties, and develops approaches and protocols used to assess or characterize contamination.

The Program also develops laboratory analytical methods to measure a wide variety of chemicals in environmental media.

crude oil spray area
Passive-vapor-diffusion samplers with (A) vial and screw cap, (B) uncapped glass vial sealed in polyethylene tubing and secured to wire surveyor flag, and (C) glass vial sealed in polyethylene sandwich bags and secured to wire surveyor flag (figure from WRIR 02-4186) -- from the Passive-Vapor-Diffusion Sampler Photo Gallery


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