8.1. Sensitivity of Instruments

Try these first

1. 1.

   What is instrument sensitivity?

   Hint

   Think about how instruments react to very low concentrations.

2. 2.

   Define sample volume.

   Hint

   Consider its relation to concentration and detection limits.

3. 3.

   What does the term 'detection limit' refer to?

   • A. Highest concentration measurable
   • B. Lowest concentration measurable
   • C. Average concentration
   • D. None of the above

   Hint

   Think about how instruments measure low levels of substances.

4. 4.

   True or False: A precise measurement is always accurate.

   • True
   • False

   Hint

   Consider how you can consistently hit the same point without hitting the target.

5. 5.

   A balance has a detection limit of 0.1 mg, but you are trying to measure a substance that is expected to be present at 0.05 mg. What should you do?

   Hint

   Consider ways to improve measurement effectiveness.

6. 6.

   You collected two samples from the same aquatic source: one with 50ml and another with 100ml. The TSS analyzed was 2 mg/L for the first and 1 mg/L for the second. Explain the anomaly.

   Hint

   Think about the impact of dilution and measurement sensitivity.