Analysis of Occupational Hazard Factors and Control Measures at a Shoe Factory

Shoe factory workers are exposed to many kinds of occupational hazard factors, including organic solvents, dust and noise. In order to prevent and control occupational diseases and protect the health of workers, the situation of occupational harmful factors in production site of shoe factory was investigated. The concentrations of toxic substances in air were measured. The results showed that benzene, toluene, ethylene dichloride and noise exceeded the standards by 13.0%, 8.7%, 26.1% and 8.7%, respectively. The effect of occupational hazards management and control is poor, and the qualified rate of monitoring in workplaces is low. The employers should strengthen the management and control of benzene series, dust and noise in the workplace to reduce the health hazards to workers.

Analysis of banned or severely restricted chemicals and pesticides entering the Russian market under the Rotterdam Convention on the prior informed consent procedure for certain hazardous chemicals and pesticides in international trade

Introduction. In recent years, due to the stricter requirements for compliance with the provisions of the Rotterdam Convention, the volume of export notifications on the permission to import dangerous chemicals into the Russian Federation has increased significantly. Therefore, the purpose of our research was to analyze the nomenclature, volume, toxicity and danger of industrial chemicals and pesticides entering the Russian market, despite prohibitions or restrictions on their use at the international and national levels. Materials and methods. The materials used are applications for the import of chemical products (export notifications) of the National Designated authorities of the European Union, China, Great Britain, Serbia to the Russian Register of Potentially Dangerous Chemical and Biological Substances-a branch of the Federal State Scientific Research Center named after F.F. Erisman - in the period from 2018 to 2020. The year 2019 was considered in the most detail. Results and discussion. The analysis of applications showed an ever-increasing number of chemical supplies; for example, 130 notifications were received in 2018, 539 in 2019, and 565 in 2020. In 2019, the number of tin compounds prevailed in the nomenclature of imported products to the territory of the Russian Federation. As for the substances from Annex III of the Rotterdam Convention, most of the imported chemicals by tonnage were substances included in this document - 1,2-dibromoethane (EDB), carbofuran, ethylene oxide, ethylene dichloride (1,2-dichloroethane), which are imported for industrial use, and not for use as pesticides, as they are declared in the convention. Chemicals and pesticides imported into the country under the PIC procedure, with the exception of numerous derivatives of dibutyl - and dioctyltin, creosote, have an established hygienic standard in at least one human habitat. In most cases, they are assigned to hazard classes 1 and 2 according to the maximum permissible concentration. Conclusion. Chemical products that are highly dangerous for human health and the environment, which are banned or severely restricted in many states, caused specific and long-term effects on the body, and having high toxicity to natural biota are used in the Russian Federation economy. In this regard, there is a need to develop regulatory decisions at the national level and within the framework of the Eurasian Economic Commission on the prohibition or restriction of the circulation of substances and pesticides characterized by an unacceptable risk of exposure.

Catalytic processing of organochlorine wastes into valuable monomers

The paper is devoted to experimental development of method for 1,1,2-trichlorethane (TCE) dehydrochlorination (DHC). The economic and environmental issues of organic chlorinated compounds processing are described. The basic principle and possible products of TCE processing are presented. The DHC of TCE, which is one of the chlorinated organic wastes produced in the ethylene dichloride process, to vinylidene chloride (VDC) was carried out over over CaO, MgO supported on SiO2 and modified with CsCl catalysts. This process was carried out in a continuous flow fixed-bed reactor. The prepared catalysts were characterized by surface area and base properties before/after reaction. The methodology for determining properties of catalyst is described. Laboratory activity test apparatus was developed, and the schematic diagram is presented in the paper. The method of determination of TCE concentration of was calculated from its partial saturation vapor pressure at a given temperature is presented. Encouraging results were obtained on the catalyst containing 10 % CsCl/CaO·SiO2. The direction of the DHC reaction changed radically under described conditions: VDC was not formed at all and the major products were cis- and trans-1,2-dichloroethene. Interesting results were obtained with the catalytic system comprising 10 % (MgO-CsCl) (1:1) supported on SiO2. DHC of 2 % TCE/Ar at 302 °C proceeds quantitatively over 20 h with selectivity for VDC of more than 80%. These systems are suitable to study the factors providing the binding and removal of HCl from the reaction zone. A possible way to increase the selectivity for VDC is the creation of the conditions favoring the DHC of TCE into VDC by the radical mechanism, which was observed in experiments with 10% CsCl/CaSiO3. The directions for future researches are formulated and described.