Water Quality and Chemistry Questions and Answers Flashcards

What is the recommended water quality standard for the final rinse of surgical instruments?

Answer: Critical water meeting AAMI TIR34 standards

The final rinse should use critical water meeting AAMI TIR34 standards with limits for bacteria, endotoxins, and dissolved minerals.

What problems can hard water cause in instrument reprocessing?

Answer: Mineral deposits on instruments, reduced detergent effectiveness, staining, and sterilizer buildup

Hard water causes mineral scale deposits, reduces detergent cleaning efficacy, creates visible staining, and can block sterilizer valves and pipes.

Why is pH monitoring important in instrument cleaning solutions?

Answer: Incorrect pH can damage instruments, reduce cleaning efficacy, and compromise the protective passive layer

Solution pH affects cleaning performance, instrument compatibility, and corrosion risk. Strongly alkaline solutions damage aluminum; strongly acidic solutions etch stainless steel.

What is the purpose of conductivity testing in reprocessing water?

Answer: To measure total dissolved solids as an indicator of water purity

Conductivity measures dissolved ion concentration, correlating with water purity. Lower conductivity means higher purity and lower mineral deposit risk.

How does chloride content in water affect surgical instruments?

Answer: Chloride ions attack the protective chromium oxide layer, causing pitting and stress corrosion cracking

Chloride ions penetrate the chromium oxide passive layer to initiate pitting corrosion and can cause stress corrosion cracking.

What role does water temperature play in enzymatic detergent effectiveness?

Answer: Enzymes have an optimal temperature range and are denatured by excessive heat

Enzymatic detergents have a specific optimal range (typically 80-110°F). Temperatures above approximately 140°F permanently destroy enzyme activity.