Practice Matrix Interference (6.2) - Introduction - part B - Environmental Quality Monitoring & Analysis,

Practise this section

10 questions

Flashcard drill
4 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
Sign up to start the exercise
Quiz
4 questions · about 3 min · pass mark 70%. Hints available.
Sign up to start the quiz

6 sample questions

Question 1.
What is the definition of matrix interference?
Show hintHide hint
Think about other substances affecting your readings.
Question 2.
Name a solvent commonly used for extraction in environmental analysis.
Show hintHide hint
It separates well from water.
3Question 3.
What does matrix interference refer to?
- A. Help from other materials
- B. Effects from other substances
- C. The benefit of surrogates
Show hintHide hint
Think about what hinders our measurements.
4Question 4.
True or False: Surrogates have no role in assessing recovery rates.
- True
- False
Show hintHide hint
Recall the purpose of adding surrogates.
Question 5.
In a liquid-liquid extraction, a scientist adds 0.1 mg of surrogate to 1 L of water and recovers 15% of it. Calculate how much surrogate was recovered.
Show hintHide hint
Use the percentage recovery to find the actual amount.
Question 6.
A soil sample's extraction returns a concentration reading higher than expected based on initial values. What steps do you take to confirm the source of error?
Show hintHide hint
Think through factors that might alter results.

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