Applying a solution of water and a stable isotope of mercury (202Hg) on the shores of a lake in the Experimental Lake Area (ELA) in Ontario, Canada. An international team of scientists tracked the applied mercury isotope to study the movement of mercury from the watershed into the lake and fish.

Does mercury affect aquatic life in the Florida Everglades?. USGS scientists are studying the fate and transport of mercury to find the answer to the question.

USGS scientists using ultra-clean techniques to collect water samples for the analysis of trace levels of mercury and methylmercury.

Sampling for mercury in high altitude (approximately 10,000 feet) lakes in the Rocky Mountains.

Sampling lakes in the Rocky Mountains for mercury and methylmercury.

USGS scientists conducted a study of the mercury levels in high altitude lakes in the Rocky Mountains.

Applying ²⁰²Hg as part of a multinational study of the fate of mercury from atmospheric deposition in pristine lakes.

USGS scientists electrofishing on the Lookout Creek near the Blue River, OR. The fish they collected were analyzed for mercury content and added to the data base that the National Fish Mercury Model is based on.

USGS scientists electrofishing from a specialized boat on the St. Marys River near MacClenny, FL. The fish they collected were analyzed for mercury content and added to the data base that the National Fish Mercury Model is based on.

USGS scientists collecting fish from the St. Marys River near MacClenny, FL, for the National Fish Mercury Model data base.

USGS scientists sampling "Cynder Pool" geyser in the Norris Basin of Yellowstone National Park, Wyoming, for dissolved mercury. Norris Basin is historically known for high sulfur and mercury levels.

USGS scientist Dr. David P. Krabbenhoft sampling Ear Spring, Yellowstone National Park, Wyoming, for dissolved mercury species. Old Faithful is erupting in the background.