[Laboratory control of disinfectant effectiveness of sodium dichlorisocyanurate]

The level of active chlorine was determined to reach 59% in the first part of the trial; this corresponds to data asserted by the producer. In the solubility test, the preparation was classified as well-soluble. The determined sodium dichlorisocyanurate dilution coefficient suggests that increasing concentrations of the active substance do not imply any significant reduction of the time needed for exposure, and considering the value of the temperature coefficient (1.166) use can be considered as possible at different temperatures of environment, especially at lower temperature levels. During the effectiveness determinations on tissue carriers, 100% disinfecting effect was achieved at a 0.1% weight concentration per volume after five minutes of exposure against E. coli and Staph. aureus germs. For brief information, theeffectiveness of sodium dichlorisocyanurate on the spores of Bacillus subtilis was also examined. At the concentrations of 0.1% and 1% weight per volume, no favourable result was obtained even after 120 minutes of exposure. When buliding material was used as carriers (metallic sheets, bricks, wood, concrete) the total of 192 smears were prepared. Each of the carriers was adjusted in two positions--horizontal and vertical. 100% effectiveness against the germs of S. aureus was obtained at the concentration of 0.35% active chlorine (0.6% wt. per active chlorine concentration as ls carriers in the Chloramin B comparative test (28% act. chlorine). The comparison of effectiveness on the basis of the same concentrations of active chlorine in both chemicals revealed that sodium dichlorisocyanurate is repeatedly effective at a 0.020% active chlorine concentration. In Chloramin B the active concentration was 0.13% active chlorine.