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BLS MIDTERM 2.doc
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1. The axiom about the potential dangers of man-made factors

Theoretically, the impact of harmful man-made factors can be eliminated completely or restricted to an acceptable risk by improving the sources of hazards and by the use of protective properties. In all cases, the manifestation of dangerous sources of the technosphere is emissions, discharges, waste, energy fields and radiation. The identity of sources of exposure in all areas of the technosphere allows create common approaches and solutions.

Solving these problems requires the implementation of the following programs:

1. Assignment of maximum permissible exposure levels for different sources and in general for the technosphere;

2. Environmental impact assessment (Экологическая экспертиза ) of proposed implementation of business decisions;

3. Environmental certification (Экологическая паспортизация) of companies (of sources of exposure).

2. Classification of hazardous substances.

Hazardous substances - substances which, upon release into the atmosphere, water, or soil, or which, in direct contact with the skin, eyes, or mucous membranes, or as additives to food, cause health risks to humans or animals through absorption, inhalation, or ingestion

Classification of hazardous substances on the nature of impacts on human health.

Chemical harmful factors on the nature of their affect on human organism are divided into the following subgroups: general toxic, irritating, sensitizing , carcinogenic , mutagenic.

This group includes many fumes and gases: fumes of benzene and toluene, carbon monoxide, sulfur dioxide, nitrogen oxides, aerosols of lead, etc., toxic dusts produced, for instance, when cutting beryllium, lead bronze and brass and some plastics with harmful fillers.

This group includes aggressive liquids (acids, alkalis), which can cause chemical burns of the skin in contact with them.

On the degree of influence on the human organism harmful substances are divided into four classes of danger: 1st - extremely hazardous substances; 2nd - highly hazardous substances; 3rd - moderately hazardous substances; 4th - low-hazard substances.

3. Maximum permissible concentrations, emissions, exposure levels

The maximum permissible concentration( MPC) of hazards substances in the environment is defined as the maximum concentration of pollutants in the environment, assigned to a particular averaging period and the periodic exposure or throughout life, which does not cause harmful impact on humans and the environment in general.

The maximum permissible emissions is the amount of pollutants emitted per unit time, which in the aggregate of the emission sources of harmful substances on a particular region or locality does not create a concentration of these substances that exceed the standard set by MAC.

Standards of MACs are uniform throughout the RK and developed by th e Ministry of Health.

The Maximum permissible levels of noise, vibration magnetic fields and other adverse physical effects are developed and established by the health authorities of the republic and are measured in decibels.

The Maximum permissible levels of radiation for magnetic fields, electromagnetic radiation , radiation are developed by the Ministry of Health and is measured in micro-roentgen per hour.

The Maximum permissible levels of chemical in agriculture-maximum norm for agrochemicals in agriculture and forestry determined with regard to pesticides, mineral fertilizers, chemical protection and stimulates plant growth.

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