The primary goal for workplace safety in mechanical processing using oil coolers is to provide users with workplaces which will protect against the risk of exposure to liquid aerosol particles. Nonwoven composites have a significant position among the filter materials used in ventilation systems for machining processes. Layered nonwoven composites not only allow for the proper adjustment of the filter thickness, but also for selecting the right filter cross section structure for the most efficient air cleaning from the polydisperse liquid aerosol. The purpose of the work was to determine the influence of selected structural parameters of the chosen nonwovens on the filtration properties of the nonwoven layer composite materials used to protect against the risk of liquid aerosols. The study included experimental determination of the relationship between such structural parameters of nonwovens as their thickness and composition of layered composites, and process parameters such as aerosol velocity relative to liquid aerosol filtration efficiency. Experimental results of the study of changes in the efficiency of aerosol filtration through layered composites of nonwovens with the courses determined in accordance with the applicable theoretical equation for the area of laminar and turbulent flow were confronted. Analysis of the research results showed the dependence of filtration efficiency on the structural parameters of the tested nonwoven composite layers (primarily thickness and composition of layered composites), mechanical processing parameters (aerosol flow velocities). This article discusses the problems of occupational safety and health, which are covered by health sciences and environmental engineering.

Reaction mass of 5-chloro-2-methyl-2H-isothiazol-3-one and 2-methyl-2H-isothiazol-3-one (3:1) (CIT/MIT) is a light yellow crystalline solid, very soluble in water. It is used as a biocide in process fluids and as a preservative in a variety of consumer products. The effects of chronic human exposure have been investigated almost exclusively for skin sensitization potential. The effects of chronic animals exposure were mainly due to the irritating effect of the substance. The critical effect of CIT/MIT is irritation of the nasal mucosa. The basis for calculating the MAC value were the results of the 13-week inhalation experiment on rats, in which the NOAEC value of 0.34 mg/m³ was determined. To calculate the MAC value, the uncertainty factor A = 2 was adopted due to differences in individual sensitivity in humans. The MAC value of 0.2 mg/m³ and STEL value of 0.4 mg/m³ have been proposed. There is no basis for setting BEI value. The following notations have been proposed: A – sensitizing substance; C – corrosive substance and Skin – skin absorption of the substance may be just as important as for inhalation exposure. This article discusses the problems of occupational safety and health, which are covered by health sciences and environmental engineering.

Dibutyl phthalate (DBP) is used as a softening additive for resins and polymers, and as a solvent, defoamer, in the production of nitrocellulose paints, glass fibers, cosmetics, drug casings, insecticides. The available literature provides information on occupational exposure to a mixture of vapors and aerosols of phthalate plasticizers only. Polyneuropathy was found in men exposed to phthalates during production. Dibutyl phthalate is classified as toxic for reproduction category 1B. The LOAEL for reproductive effects, as manifested by a significant and dose-dependent increase in the incidence of morphologically abnormal sperm in rats, is 31 mg/kg bw/day. In turn, in mice, decreased testicular weight, delayed spermatogenesis and impaired maturation of Sertoli cells were observed as a result of exposure to dibutyl phthalate at a dose of ≥ 1 mg/kg bw/day. Irritation to the respiratory tract and effect on reproduction were considered to be a critical effect of dibutyl phthalate. The results of a 4-week experiment on rats were used as the basis for the calculation of the MAC value. The concentration of 1.18 mg/m³ was adopted as the NOAEC. It was proposed to assume the concentration of 0.6 mg/m³ as the MAC value. Short term exposure value has not been established.

Due to its physicochemical properties, cobalt in metallic form is used in the production of the following alloys: heat resistant, permanent magnets and foundry alloys. Moreover, cobalt salts are widely used in the production of pigments, oil drying agents and batteries. Metallic cobalt in the form of fine powder in contact with skin can cause an allergic response. However, the main danger are soluble cobalt salts, which are classified as carcinogens according to the European Union Commission Regulation (WE 1272/2008). The aim of this study was to develop a method for determining cobalt to assess occupational exposure within 1/10 ÷ 2 of the proposed MAC value. The method consists in taking an aerosol of cobalt and its compounds contained in the air onto a filter, mineralization of the filter in nitric acid(V) and hydrochloric acid at elevated temperature and then determination of cobalt content in the sample using atomic absorption spectrometry with electrothermal atomization (ET-AAS). Validation requirements presented in Standard No. PN-EN 482 were fulfilled during the tests. The method allow the determination of cobalt and its compounds in workplace air at concentrations of 0.0001 ÷ 0.002 mg/m³ for the respirable fraction. LOQ is 0.017 µg/m³. The overall precision of the study was 5.39% and the expanded uncertainty was 23.56%. The method for determining acrylonitrile has been recorded in the form of an analytical procedure (see Appendix). This article discusses the problems of occupational safety and health, which are covered by health sciences and environmental engineering.

2-Methoxypropan-1-ol (2M1P) is a colorless, flammable liquid with an irritating effect. It is a primary alcohol formed as a by-product in the production of propylene glycol monomethyl ether (1‑methoxypropan-2-ol). Therefore, exposure to this substance is inextricably connected with exposure to 1‑methoxypropan-2-ol which is used as a solvent for paints, varnishes, dyes, etc., and as a component of cleaning preparations and an intermediate for chemical synthesis. In working environment, workers may be exposed to the action of 2-methoxypropan-1-ol by inhalation and dermal route. The aim of this study was to develop and validate a method for determining 2‑methoxypropan-1-ol in workplace air. The developed method of 2M1P determination consists in adsorption of vapors of this substance on coconut shell charcoal, extraction with a solution of methanol in carbon disulfide and chromatographic analysis of the obtained solution. The study was performed with gas chromatograph coupled with mass spectrometer (GC-MS), equipped with a polar ZB-WAXplus capillary column (length 60 m, diameter 0.25 mm and the film thickness of the stationary phase 0.5 µm). The developed method is linear in the concentration range of 10.0-400.0 µg/ml, which corresponds to the range of 1.0-40.0 mg/m³ for a 10-L air sample.The analytical method described in this paper makes it possible to determine 2‑methoxypropan-1-ol in workplace air in the presence of comorbid substances. This method is precise, accurate and it meets the criteria for procedure for determining chemical agents listed in Standard No. PN-EN 482. The developed method of determination of 2‑methoxypropan-1-ol in workplace air has been recorded as an analytical procedure (see Appendix). This article discusses the problems of occupational safety and health, which are covered by health sciences and environmental engineering.