Abstract
We examined the clinical usefulness of the disinfectants in two respects, namely the corrosve effect on piping materials of dialysating machine, and dissolbility of calcium carbonate. The Disinfectants we examined were sodium hypochloride, QC-70(AMTEC), MC-1000(MEDICO CHEMIE), and SHUMMA(SASAKI KAGAKU). The materials we tested were stainless steel(SUS304 and SUS316), polypropylene, siiicone and teflon. Each material was cut to sive inner surface area of 20cm2, and soaked for 28days in a solution of each disinfectant. To test their dissolubility, 0.5g of calcium carbonate was mixedwith 50ml each of the disinfectansand the aceticacid solution, as control. After stirring it well, each sample solution was collected and the ionized calcium level was measured. Both of the stainless steel were corroded by sodium hypochloride and SHUMMA. Polymer materials were not corroded by any of the disinfectants examined. None of the disinfectants could dissolve calucium carbonate. However acetic acid solution could dissolve the calcium carbonate of the concentration as higher than l%. We conclude four our study that polymer material is more preferable than stainless steel in terms of the corrosivity. Among the disinfectants we examined and the acetic acid, only the acetic acid can dissolve calcium carbonate with the as low as concentration 1%. Therefore, calcium carbonate deposite on the innersurface of the pipe could be removed by acetic acid solution.
