CIS Water Quality and Chemistry Questions and Answers 2

Question 1

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

Accepted Answer

Critical water meeting AAMI TIR34 standards

Answer

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

Question 2

What problems can hard water cause in instrument reprocessing?

Accepted Answer

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

Answer

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

Question 3

Why is pH monitoring important in instrument cleaning solutions?

Accepted Answer

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

Answer

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

Question 4

What is the purpose of conductivity testing in reprocessing water?

Accepted Answer

To measure total dissolved solids as an indicator of water purity

Answer

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

Question 5

How does chloride content in water affect surgical instruments?

Accepted Answer

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

Answer

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

CIS - Certified Instrument Specialist Practice Test

CIS - Certified Instrument Specialist Practice Test

CIS Water Quality and Chemistry Questions and Answers 2