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A U.S. Geological Survey chemist evaporating sample extracts

By Environmental Health Program 2017 (approx.)
A U.S. Geological Survey chemist evaporating sample extracts in laboratory hood to concentrate pesticide residues
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Detailed Description

Organic Chemistry Research Laboratory — Sacramento, California. A U.S. Geological Survey chemist evaporating sample extracts in laboratory hood to concentrate pesticide residues for later analysis. The samples are process with nitrogen so they are not oxidized.

Sources/Usage

Public Domain.

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