earticle

영어

As the exposure standards for o-dichlorobenzene is revised to the level of an advanced nation, it offers that the 25 ppm(150 mg/㎥) of TLV-TWA is newly established and the 50 ppm(301 mg/㎥) of TLV-STEL is changed to minimize the occurrence of occupational hazard of workers handling o-dichlorobenzene. The reason for the newly establishing has a setting background of the exposure standard of the advanced nation and a scientific approach through a research data and a review for human and animal toxicity, and has a technical approach through a review for the application of revised criteria for exposure as establishing to improve the working environment to catch hold of the actual conditions of working environment, and synthesizes the administrative and economic basis of impact analysis of regulatory for the ripple effect to the domestic industry as the application of revised criteria for exposure. Specially, most of the process to use o-dichlorobenzene in foreign and domestic set by considering to have a regular work cycle and to carry out an operation continuously. Also, the reason to change is that the property of an operation has injection for melting o-dichlorobenzene of intermediate products and has the situation as a lot of work and the work possible with high concentration exposure in short-term for sampling of the material response to confirm the status of reaction, and as the assessment according to current standards of maximum exposure can not actually measure the concentration of the moment, the concentration of the 15-minute exposure should be evaluated by looking, and the confirmation for whether it always maintained well below this concentration is set to consider technically difficult.