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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is an analyte?
💡 Hint: Think about what we measure in environmental samples.
Question 2
Easy
Name one method of extraction.
💡 Hint: Consider methods used when preparing samples.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
What is the purpose of sample extraction?
- To dilute the analyte
- To isolate the analyte for analysis
- To enhance instrument response
💡 Hint: Remember that not all samples can be analyzed directly.
Question 2
True or False: Solid-Phase Extraction is more messier than Liquid-Liquid Extraction.
- True
- False
💡 Hint: Consider the steps involved in each method.
Solve 1 more question and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
You have a 1 L water sample with an unknown concentration of analyte A. You perform a liquid-liquid extraction using 20 mL of solvent, recovering 5 mL of extract with a measured concentration of 10 mg/L in the extract. What was the concentration of A in the original sample?
💡 Hint: Think about how concentrations change with volume.
Question 2
A certain extraction process shows a fractional recovery of 70%. If you added 20 µg of analyte A into the sample, how much analyte is recovered?
💡 Hint: Focus on how recovery percentages affect the amounts.
Challenge and get performance evaluation