[Hygienic characteristic of some new materials used for new and modernized water supply systems]. / Gigienicheskaia kharakteristika nekotorykh novykh materialov, prednaznachennykh dlia ispolzovaniia v novykh i modernizirovannykh sistemakh vodoobespecheniia.

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.

[Toxicologic evaluation of purified municipal and industrial waste water]. / Toksikologicheskaia otsenka doochishchennykh gorodskikh i proizvodstvennykh stochnykh vod.

Analysis of waters sewage in Kiev and of waste water of a textile and se wing enterprise in Chernigov has shown that treatment by biological method and with activated carbon was fairely efficient in toxicity reduction.

[Hygienic study of an activated fibrous charcoal material as a sorbing filtering element for drinking water afterpurification]. / Gigienicheskoe izuchenie aktivirovannogo uglerodnogo voloknistogo materiala v sostave sorbiruiushchego fil'truiushchego élementa dlia doochistki pit'evoi vody.

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 water filtered through the absorptive element with ACFM had no adverse influence on the organisms of warm-blooded animals. Proceeding from foregoing one can conclude that the "Dnepr-F" may be recommended as a part of absorptive filtering element for the final refinement of drinking water.

[The hygienic evaluation of an aerosol-gas mixture as a preservative of potable water]. / Gigienicheskaia otsenka aérozol'no-gazovoi smesi kak konservanta pit'evoi vody.

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.

[Setting a maximum allowable concentration for urea in reclaimed potable water and evaluating the nature of its biological action]. / Obosnovanie PDK mocheviny v regenerirovannoi pit'evoi vode i otsenka kharaktera ee biologichekogo deistviia.

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. However, when used in high doses it affects bioenergetic and cholinergic processes and causes changes in ECG, higher nervous activity and visceral structure. It has been shown that when applied to warm-blooded animals the acting dose of urea is 14.3 and 1.43 mg/kg (1/1000 and 1/10000 LD50), the threshold dose is 0.72 mg/kg (1/20000 LD50), and the ineffective dose is 0.36 mg/kg (1/40000 LD50) which amounts to the concentration of 10 mg/l. In terms of toxic effects the dose equal to 10 mg/l is taken to be the maximally allowable concentration of urea. It is recommended to use the Laham biotest for measuring urea in water.

[Experimental substantiation of the maximum permissible concentrations of acetone and acetaldehyde in regenerated drinking water]. / Eksperimental'noe obosnovanie predel'no dopustimykh kontsentratsii atsetoma i atsetal'degida v regenerirovannoi pit'evoi vode.

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 0.2 mg/l for acetone and acetaldehyde, respectively. The recommended levels for reclaimed water used for 1--3 months are 39.6 mg/l and 0.2 mg/l for acetone and acetaldehyde, respectively.