character: Professor Mark Lewis
topic: Methods for Analyzing Heavy Metals in Water Samples
grade: 12
subject: Chemistry
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character: Dr. Emily Carter
topic: Techniques for Water Quality Assessment
grade: 12
subject: Chemistry
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character: Mr. John Smith
topic: Understanding Heavy Metal Contamination
grade: 12
subject: Chemistry
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character: Ms. Sarah Johnson
topic: Environmental Chemistry: Analyzing Pollutants
grade: 12
subject: Chemistry
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