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L2 - Analytical Environmental Chemistry CHM410/1410 Fall...

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Analytical Environmental Chemistry CHM410/1410 Fall 2011 Lecture 2 Sample preparation 1 1
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Reminders Lab sessions (am/pm) tomorrow Get and Study the lab manual Be punctual, please 2
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Analytical Environmental Chemistry Observation Question Measurement Conclusion 3
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Scenario: A farmer applies this pesticide onto his fields, he wants to know if he will contaminate the stream/ponds nearby after application. Trifluralin 4
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5
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6 TMF TMF BCF BSAF BSAF
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After the chemicals are introduced into the environment, they will distribute themselves: 7
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Expect: - Stick to the soil But: - Types of soil and pH - Leach out Trifluralin 8
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After the chemicals are introduced into the environment, they will distribute themselves: 9
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Air Water Octanol (hydrophobic) K AW K OA K OW Small Non-polar (non-interactive) Small Polar (interactive) Large Non-polar (non-interactive) H H H H O H HO OH H H OH OH H H OH 10
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Partitioning among different phases Until equilibrium is reached 11
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What is an extraction?
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L2 - Analytical Environmental Chemistry CHM410/1410 Fall...

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