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Organic Matter
chemistryBiological soil such as blood, food, and body fluids that can reduce disinfectant effectiveness.
Definition
Organic matter refers to biological residues — including blood, mucus, food debris, faeces, and soil — that may be present on surfaces. It can chemically inactivate disinfectants (particularly chlorine-based products) and physically shield microorganisms.
Why it matters
The presence of organic matter is one of the main reasons disinfectants fail in practice; removing it via cleaning is essential to achieve the target log reduction.
Practical applications
Explicitly addressed in cleaning-then-disinfection protocols, spill management procedures, and disinfectant dose selection for heavily soiled areas.
Related terms
Referenced in
- The Technical Guide to NaDCC Disinfectant Tablets: Chemistry, Dilution, and Operational Implementation
- Can You Actually Sanitise a Used Sponge—or Is Replacing It Safer?
- When Is an Operating Theatre Safe to Reopen? A Guide to Terminal Cleaning and Environmental Verification
- How Does ATP Testing Work?
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