CCHT - Certified Clinical Hemodialysis Technician Water Treatment and Quality 1

Question 1

What is the primary role of carbon tanks in the dialysis water treatment system?

Accepted Answer

Adsorb chlorine and chloramines before water reaches the RO membrane

Answer

Remove calcium and magnesium ions through ion exchange

Answer

Filter out particulate matter larger than 5 microns

Answer

Eliminate bacteria and endotoxins through UV irradiation

Question 2

According to AAMI standards, what is the maximum allowable endotoxin level in water used for standard hemodialysis?

Accepted Answer

2 EU/mL

Answer

0.03 EU/mL

Answer

0.25 EU/mL

Answer

10 EU/mL

Question 3

What is the primary mechanism by which a reverse osmosis (RO) system purifies dialysis water?

Accepted Answer

Forcing water through a semi-permeable membrane under pressure, rejecting 90–99% of dissolved solutes

Answer

Ion exchange resin that traps dissolved minerals

Answer

Ultraviolet light that breaks down organic contaminants

Answer

Activated carbon adsorption of heavy metals and ions

Question 4

Which reagent is used in the standard colorimetric test to check for free chlorine residual in dialysis water?

Accepted Answer

DPD (N,N-diethyl-p-phenylenediamine)

Answer

Phenolphthalein

Answer

Sodium thiosulfate

Answer

Orthotoluidine

Question 5

At minimum, how frequently should dialysis water be tested for bacteriological contamination according to AAMI guidelines?

Accepted Answer

Monthly

Answer

Daily

Answer

Weekly

Answer

Quarterly

Question 6

What is the function of a deionizer (DI unit) in a dialysis water treatment system?

Accepted Answer

Exchange cations and anions in water for hydrogen and hydroxyl ions, producing highly purified water

Answer

Remove residual chlorine through catalytic reduction

Answer

Kill microorganisms by exposing water to high-intensity ultraviolet light

Answer

Reduce water pressure to a safe level before it enters the RO membrane