Practice Standard Spiking And Cleanup Process (1.1.9) - Environmental Analysis of Organics in Water

Practice: Standard Spiking and Cleanup Process

Lesson 1.1.9Environmental Analysis of Organics in Water

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9 questions

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3 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
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Quiz
3 questions · about 2 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What is the purpose of extracting an analyte from water?
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Think about why direct measurement might not work.
Question 2.
Define cleanup in the context of analytical chemistry.
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Consider what can interfere with the accuracy of measurements.
3Question 3.
What is the first step in analyzing an analyte in water?
- Directly inject water into the instrument
- Extract the analyte into a solvent
- Measure pH directly
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Think about why direct measurement could be problematic.
4Question 4.
True or False: Cleanup processes are optional in analytical chemistry.
- True
- False
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Consider what could affect the integrity of your analysis.
Question 5.
You have a water sample that contains an unknown concentration of pollutant A. After applying a matrix spike of 5 micrograms, you find 4 micrograms in the analysis. Calculate the recovery percentage.
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Think about the formula for calculating recovery percentages.
Question 6.
Describe a scenario where an extraction method might fail, and discuss the possible consequences in environmental analysis.
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Consider the importance of selecting appropriate solvents to avoid contamination.

5 more questions in this section. Enroll free to practise them all.