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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What is a surrogate in analytical chemistry?
💡 Hint: Think about a reference compound.
Question 2
Easy
Why is concentration important after extraction?
💡 Hint: What happens when we reduce volume?
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 using a surrogate?
- To increase detection limits
- To mimic analyte behavior
- To reduce sample size
💡 Hint: Think about why we would need a stand-in for the analyte.
Question 2
The extraction efficiency is always expected to be 100%. True or False?
- True
- False
💡 Hint: What influences the effectiveness of extraction?
Solve and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
You have a 1L water sample with an initial surrogate concentration of 100 µg/L. If after analysis you recover 80 µg, what is your recovery percentage?
💡 Hint: Use the recovery formula.
Question 2
If you began with a 10 µg/L surrogate in a 40 mL extraction and found 0.5 µg in the final 1 mL, what was your initial concentration in the entire 1L sample?
💡 Hint: Think about how concentration scales with volume.
Challenge and get performance evaluation