Lab and Testing
Course Pack: Microbiological Testing & Chlorine Interference Management
Interferences
Course Description
This module provides Interferences Training focused on common challenges encountered during DPD-based chlorine testing, including the effects of manganese, phosphorus, ammonia, and other factors that can impact test accuracy. Learners explore quality control practices, interference identification, and methods to improve testing reliability. Through this Interferences Training, operators gain the knowledge needed to recognize potential errors, maintain accurate chlorine measurements, and support effective water quality monitoring.
Learning Objectives
1) Recognize common DPD interferences
2) Correct for manganese and phosphorus impacts
3) Identify ammonia‑related bias
4) Apply proper meter operation checks
5) Improve reliability of residual testing
Agenda
1) Proper operation and use of DPD analyzers
2) Identifying and resolving manganese interference
3) Understanding phosphorus and ammonia impacts on readings
4) Key quality control practices
5) Operator examples illustrating typical issues
Target audience
Operators responsible for chlorine/chloramine testing
Level
II
Learning material and method
Online on-demand
Assessment
Knowledge check and quiz (80% correct and above)
Instructor
Mike Harrington