Testing of disinfectants

Surface disinfection tests• Assess the effectiveness of the disinfectant against surfaceadheredmicroorganisms.• The test surface (e.g. a microscopic slide) is contaminatedwith a standardized inoculum of the test bacteria and dried.• Then a definite volume of the disinfectant solution isdistributed over the carrier• After the given exposure time the number of survivors isdetermined by impression on a contact plate or by a rinsingtechnique, in which the carrier is rinsed in a diluent, and thenumber of bacteria is determined in the rinsing fluid.