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Department of Municipal Hygiene and Occupational Health. Lecture on communal hygiene for 4th year. Subject : Principles of hygienic regulation of harmful substances in water reservoirs. Maximum allowable concentration.
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Department of Municipal Hygiene and Occupational Health Lecture on communal hygiene for 4th year Subject: Principles of hygienic regulation of harmful substances in water reservoirs..
Maximum allowable concentration concentration is such that under the influence of the human body or periodically throughout the life-directly or indirectly through a system of environmental and economic damage after possible not occur
physical and mental health (including hidden and temporarily compensated) changes in the health beyond the adaptive physiological responses detected by modern methods at once or in remote periods of life of present and future generations.
Rationing of water is based on the following principles: 1. The principle of maintaining the constancy of the internal environment and ensure its unity with the environment, the implied warranties of no direct or indirect influence of the substance on human health in the concentration does not exceed the MPC.
2 Principle of the threshold emphasizing the possibility of establishing a concentration at which there is not any changes in the functional state of an organism determined by modern research methods. 3 Setting the MPC simulation results of various kinds of biological action of a substance in the experiment.
4 Dependence of the biological effect of dose and duration of exposure. This principle should be considered when planning the toxicological experiments; 5. Stages study suggests the optimal MPC effort and resources adequate to experiment and properties of substances toksikodinamicheskim
MAC water - a standard to determine the safety of water for health and sanitary conditions are favorable - domestic water use.
All toxicological studies conducted on the basis of experiments on warm-blooded laboratory animals: white rats, white mice, rabbits.
first step Toxicity studies of harmful substances begin with a study of fatal effects in acute experiments.
II- stage. The study of the influence of the skin him.veschestv conducted on rabbits and white rats. 3-phase. The study of the cumulative properties of the drug.
The study of the effect of the substance on the organoleptic properties water. Effect of substance on the organoleptic properties of water can be seen in the change: odor; taste; painting; In the formation of a film or foam.
The purpose of research is to establish the concentration of the substance in which its impact on the organoleptic properties of water still does not restrict the use of water bodies for economic - drinking and household needs.
The intensity of the odor and flavor of water of water sources used for drinking water shall not exceed 2 points.
STUDY OF THE INFLUENCE OF HARMFUL SUBSTANCES IN GENERAL sanitary regime POND The objective is to - prevent violations of self-purification of water from the reservoir of organic pollution of domestic wastewater.
STUDY ON THE PREPARATION OF WATER RESERVOIRS self-cleaning process 1.converting organic substances into inorganic. 2.okislenie ammonium and nitrate salts in which the energy required for the assimilation of carbon carbonic acid bacteria.
IV-stage.? Carrying a 12 - month experiment when exposed to low doses. The study of long-term effects. The objective of chronic experiment is: identifying the maximum dose inactive substances, taking into account that the MPC is recommended in water reservoirs and calculates the acceptable daily intake (ADI) of the substance to humans.
