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Hazard Class

Hazard class - the conditional value of the harmful effect, which is established in accordance with regulatory industry documents. For different objects - for chemicals .

Content

Hazard Class

The hazard class of harmful substances is a conditional value intended for a simplified classification of potentially hazardous substances.

The hazard class of harmful substances is established depending on the norms and indicators. Indicators according to GOST 12.1.007-76 [1] are indicated in the following table. The assignment of a harmful substance to a hazard class is carried out according to an indicator whose value corresponds to the highest hazard class.

Name of indicatorNorm for hazard class
IVIIIIII
MPC of harmful substances in the air of the working area, mg / m³more than 10.01.1-10.00.1-1.0less than 0.1
The average lethal dose (LD 50 ) when introduced into the stomach, mg per 1 kg of body weightmore than 5000151-500015-150less than 15
The average lethal dose when applied to the skin, mg per 1 kg of body weightmore than 2500501-2500100-500less than 100
Average lethal concentration in air, mg / m³more than 50,0005001-50 000500-5000less than 500
Coefficient of possibility of inhalation poisoning (CVI)less than 329-330-300more than 300
Acute areamore than 54.018.1-54.06.0-18.0less than 6.0
Chronic areamore than 10.010.0-5.04.9-2.5less than 2.5

Definition of hazard class

Experimental Method

Initially, the experimental determination of the toxicological properties of substances underlies the assessment of their hazard class and other derived characteristics. For greater accuracy, the assessment is recommended based on the results of toxicity studies in relation to two to three species of animals or test cultures (strains, etc.).

Calculation Method

The calculation method is based on a database of toxicological properties of individual substances in combination with a fairly complete analytical study of the object. In practice, the application of the calculation method is associated with a number of limitations that are not consciously taken into account, and is used only because of the high cost of direct toxicological research of the object.

See also

  • Maximum permissible concentration
  • Lethal dose
  • Hazard symbols

Notes

  1. ↑ GOST 12.1.007-76

Sources

  • GOST 12.1.007-76
  • SanPiN 2.1.4.1074-01

Advanced

  • Types of dangerous goods according to the UN classification
  • Dangerous goods, electronic directory
  • Environmental Protection in Russia in 2016

Links

  • Online Substance Guide
Source - https://ru.wikipedia.org/w/index.php?title= Danger Class&oldid = 91812837


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Clever Geek | 2019