Abstract
We developed the central supply system for the dialysate with bicarbonate as a buffer. Three main problems occured to make bicarbonate dialysate as follows;
1) precipitation of carbonates.
2) control of dialysate pH.
3) corrosion of materials used for the device.
Precipitation of carbonates and control of dialysate pH were solved by the addition of lactic acid or co2 bubbling and indirect heating of dialysate. Metals used for the device were corroded in the presence of bicarbonate. We have tried a sus-304 and sus-316 stainless steel for twenty weeks. Sus-304 was corroded in this period. Sus-316 had more resistant to the corrosion than sus-304. In order to prevent a corrosion, a ceramics and titanium seem to be suitable for the bicarbonate dialysate-central supply system.
