ELAP Webinar 23 - Method Detection Limits in an ELAP Laboratory

Method Detection Limits in an ELAP Laboratory

This webinar will review method detection limit (MDL) procedures and rules and examples of how to implement them in your laboratory. We will discuss EPA and TNI regulations concerning MDLs along with a discussion of detection limits (DLs), practical quantitation limits (PQLs), reporting limits (RLs), limits of quantitation (LOQs). This webinar is intended for laboratory management, supervisors, and analysts.


  • Introduction
  • Definitions – MDL, PQL, RL, DL, LOQ

How to determine a MDL

  • Estimate initial
  • Determine initial
  • Ongoing data collection
  • Ongoing verification

Low level spike and blank calculations
Ongoing verifications
Reporting limits

Your Instructor

Tony Francis, PhD
Tony Francis, PhD

Dr. Francis has extensive experience in chemistry and biology. He is currently a principal with SAW Environmental (2004 to present). He was owner/operator of a large environmental laboratory in Nevada prior to becoming a full-time consultant. He performs and manages third‐party laboratory audits for several states, QA/QC consulting to individual laboratories, and provides internal audits, data integrity training, and data validation to private and governmental laboratories. Dr. Francis is a contract assessor for IAS assessing laboratories to ISO/IEC 17025 and various TNI Standards. He is a fully qualified NELAC assessor in organic and inorganic chemistry, microbiology, cryptosporidium, radiochemistry, solids, aqueous, tissue, and air. He is an EPA-approved drinking water certification officer in all areas available.

Dr. Francis performs 30-40 audits per year. He received his PhD in chemistry from the U. of Utah, 2003

Frequently Asked Questions

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