The KI (potassium iodide) discus test
The KI Discus test has been designed to enable operator and environment protection factors and, where appropriate, product protection and cross contamination factors to be measured for:
– Class I and Class II Kojair microbiological safety cabinets.
– Special hybrid facilities such as carcinogen and radio-pharmaceutical cabinets.
– General purpose laboratory fume cupboards.
The KI Discus test enables cabinets to be tested:
– With no bacterial contamination risk of the containment facility.
– With no bacterial contamination risk of the laboratory.
The results of the KI Discus test are available within a few minutes.
What is a KI discus test:
A fine mist of potassium iodide droplets, produced by a spinning disk, is used as a challenge aerosol to measure the containment of a Kojair safety cabinet. Centripetal collectors sample the air outside or inside the cabinet – depending on the nature of the test. The collectors deposit any potassium iodide particles that are in the sampled air on to filter membranes. At the end of the sampling period the filter membranes are placed into a solution of palladium chloride whereupon the potassium iodide “develops” to form clearly visible and easily identified grey/brown dots.
A knowledge of the number of droplets in the challenge produced by the mist generator and the number collected in the air samplers enables the protection factor for the cabinet to be calculated. All open-fronted microbiological safety cabinets are assessed on this protection factor.
The KI-Discus test is defined in the European Standard for microbiological safety cabinets, EN-12469:2000.
According to EN 12469:2000 Apf of not less than 100,000 for each collectors or there should not be more than 62 brown dots on the KI discus filter membrane after development in palladium chloride.
Kojair can arrange KI discuss test on (your) location. Please contact your area sales manager for more information and possibilities, click here