Practice Calculating Analyte Concentration (4.2.2) - Introduction

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6 sample questions

Question 1.
What is a surrogate in analytical chemistry?
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Think about a reference compound.
Question 2.
Why is concentration important after extraction?
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What happens when we reduce volume?
3Question 3.
What is the purpose of using a surrogate?
- To increase detection limits
- To mimic analyte behavior
- To reduce sample size
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Think about why we would need a stand-in for the analyte.
4Question 4.
The extraction efficiency is always expected to be 100%. True or False?
- True
- False
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What influences the effectiveness of extraction?
Question 5.
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?
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Use the recovery formula.
Question 6.
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?
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Think about how concentration scales with volume.

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