[Hygienic characteristic of some new materials used for new and modernized water supply systems].

Activated carbon FAS/Pt and membrane GOMPOD do not deteriorate water quality under its purification. Mineralisator MP-UK in general does not deteriorate water quality. All the studied materials were recommended for treatment and conditioning of water in space apparatuses.

[Hygienic study of an activated fibrous charcoal material as a sorbing filtering element for drinking water afterpurification].

The results of complex toxicological and hygienic study showed that the quality of pipe water filtered through the activated carbonic fibrous material (ACFM) "Dnepr-F" forming a part of absorptive filtering element improved markedly. The content of organic substances decreased drastically as well as that of nitrates and iron. Microbiological indices did not suffer appreciable changes and were within permissible limits.

[The hygienic evaluation of an aerosol-gas mixture as a preservative of potable water].

Complex hygienic assessment of the aerosol-gas method for the drinking water conservation demonstrated no significant effects on white rats in toxicological and genetical experiments. The method was recommended for long-term conservation of the drinking water in steel tanks.

[The hygienic assessment of D-51A rubber and the conditions for its practical use in household drinking water supply].

Rubber D-51A under examination, treated by thiuram, following long-time contact with drinking water (static conditions of the experiment) discharges thiuram into it, which significantly worsens the water quality. Drinking of this water by animals leads to functional disturbances in their organisms. Short-time contact of rubber D-51A with drinking water does not cause deterioration of its quality.

[Setting a maximum allowable concentration for urea in reclaimed potable water and evaluating the nature of its biological action].

The purpose of the study was to identify maxim allowable concentrations of urea in reclaimed potable water. The urea concentration equal to 80 mg/l is the threshold dose influencing the taste and flavor of water. Urea is a low toxicity substance (LD50 = 14,300 mg/kg), the effect of which is not cumulative.

[Experimental substantiation of the maximum permissible concentrations of acetone and acetaldehyde in regenerated drinking water].

The paper presents experimental data indicating maximum permissible concentrations of acetone and acetaldehyde in reclaimed potable water used for different periods of time--up to 1, 3 or 12 months. The recommended concentrations for reclaimed water used for a year are 14.0 mg/l and 0.