Practice False Negatives (5.1) - Analyte Losses in Chemical Analysis - Environmental Quality Monitoring & Analysis, - Vol 2

Practice: False Negatives

Lesson 5.1Analyte Losses in Chemical Analysis

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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 a false negative in environmental analysis?
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Think about measurement inaccuracies.
Question 2.
Name one process that can cause analyte loss.
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Consider what happens if a sample evaporates.
3Question 3.
What is a false negative?
- A measurement of concentration that is too high.
- A measurement indicating a pollutant is absent when it's present.
- A filtering error during sample analysis.
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Think about what it means to miss something that is indeed present.
4Question 4.
True or False: Adsorption can lead to increased measurements of analytes.
- True
- False
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Consider what happens to substances that cling instead of remaining in liquid form.
Question 5.
A lake water sample has been stored in a non-air-tight container for a week. Discuss the potential impacts on the reported analyte concentrations, focusing on the processes of volatilization and biodegradation.
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Consider the effects of exposure to air over time.
Question 6.
Design a quality control plan to minimize false negatives in testing a chemical contaminant in soil samples. Outline three key steps you would take.
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Think about maintaining sample integrity throughout analysis.

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