9.2. Method Detection Limit

Try these first

1. 1.

   What does MDL stand for?

   Hint

   Think about how we detect chemicals.

2. 2.

   How does the sampling volume affect analysis?

   Hint

   Consider the relationship between volume and detection.

3. 3.

   What is the Method Detection Limit (MDL)?

   • The lowest concentration detectable by a method
   • The highest concentration measurable
   • The average concentration in a sample

   Hint

   Think about how low a measurement can go and still be valid.

4. 4.

   True or False: A reading of zero from an instrument confirms that no analyte is present.

   • True
   • False

   Hint

   Remember what MDLs indicate about detection capabilities.

5. 5.

   A testing laboratory has an instrument with an MDL of 0.01 mg/mL. They analyze a water sample with a suspected concentration of 0.008 mg/mL. Discuss the implications of their findings.

   Hint

   Consider how undetected substances may affect assessments.

6. 6.

   Explain how changing the sampling method could influence the MDL of a particular analyte in a given environmental sample.

   Hint

   Think about how different approaches might change results.