Practice Sample Analysis Techniques (6) - Introduction - part B - Environmental Quality Monitoring & Analysis, - Vol 2

Practice: Sample Analysis Techniques

Lesson 6Introduction - part B

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10 questions

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6 questions · about 4 min · pass mark 70%. Hints available.
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4 questions · about 3 min · pass mark 70%. Hints available.
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6 sample questions

Question 1.
What is a surrogate in sample analysis?
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Think of what assists in measuring the main component.
Question 2.
Which solvent is commonly used for extraction in this context?
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Remember the solvent often mentioned in extraction processes.
3Question 3.
What is the purpose of adding a surrogate to a sample?
- To dilute the sample
- To mimic the analyte behavior
- To increase extraction time
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Think about what helps measure the analyte accurately.
4Question 4.
True or False: Calibration ensures accurate quantification of analytes.
- True
- False
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It's all about measurement accuracy.
Question 5.
You are given a sample containing an unknown concentration of an analyte. You add 200 micrograms of surrogate and recover 180 micrograms after analysis. If your calibration response indicates that the recovered analyte corresponds to 150 nanograms, what is the recovery efficiency of the surrogate?
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Think about how you express recovery efficiency as a percentage.
Question 6.
In an analysis, you extract from a 100ml sample and recover 60ml of hexane, which is concentrated down to 5ml, resulting in a measured instrument response of 240,000 units. If the calibration curve yields a formula of response = 120,000 * m, what is the mass of the analyte obtained?
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Use your calibration equation to find mass based on response.

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