California Cosmetology Written ExamSafety and Infection ControlHard
A nail technician wants to verify that her multi-use quaternary ammonium disinfectant solution maintains proper strength throughout a busy workday. What is the best practice for confirming this?
- AUse quat concentration (ppm) test strips designed for that disinfectant type
- BUse pH test strips designed for swimming pools
- CRely on litmus paper color change
- DJudge sufficiency visually by checking whether the solution looks cloudy
Show answer & explanationAnswer & explanation
Correct answer: A. Use quat concentration (ppm) test strips designed for that disinfectant type
Quat concentration test strips are designed to verify that a quaternary ammonium disinfectant solution remains at its effective parts-per-million (ppm) strength, since repeated implement dipping and evaporation can dilute or weaken it over the day. Visual inspection or unrelated test strips cannot reliably confirm proper germicidal strength.
Why the other options are wrong
- B. Pool pH strips measure a different chemical property and are not designed for quat disinfectants.
- C. Litmus paper measures general acidity/alkalinity, not disinfectant efficacy.
- D. Cloudiness indicates the solution needs replacement, but doesn't measure remaining strength before that point.
Quat Concentration Test Strips
Test strips designed to measure the parts-per-million (ppm) strength of a quaternary ammonium disinfectant solution, ensuring it remains effective throughout use.
- Confirms disinfectant is at effective strength, not diluted
- Different from pH or litmus test strips
- Should be checked periodically during a busy workday
Memory trick: 'Right strip for the right dip' — quat strips for quat solutions.