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A USGS scientist prepares a tracer solution in a gas-tight bladder

By Environmental Health Program 2007 (approx.)
A USGS scientist prepares a tracer solution in a gas-tight bladder that will be pumped into the groundwater
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Detailed Description

A USGS scientist prepares a tracer solution in a gas-tight bladder that will be pumped into a zone of nitrate-containing groundwater to monitor the production and consumption of nitric oxide dissolved in groundwater.

Sources/Usage

Public Domain.