Assessment of residual exposure to PCBs in metallurgy

This study evaluated the occupational exposure to polychlorinated biphenyls (PCBs) in 56 workers employed in 6 electric arc furnace steelmaking plants and 2 secondary aluminium smelting plants located in the highly industrialised area of Brescia, Northern Italy. Thirty-four PCB congeners were found in both environmental and biological samples from workers engaged in scrap yards, electric arc furnaces, casting and maintenance departments. The highest airborne PCB levels were found in the aluminium plant, even 100 times those detected in the steelwork plants. Dioxin-like PCB congeners (DL-PCBs) were poorly represented in all biological samples, whereas non-Dioxin-Like PCB congeners (noDL-PCBs), in particular environmentally widespread congeners (PCB 153, 138, 180), could be detected in almost all samples. The mean total PCB serum level was 3.9 ng/ml, with a range of 1.3-10.3 ng/ml, while the geometric mean for airborne PCBs levels was 9305 pg/m3, with a range of 1138-217806 pg/m3. The authors concluded that despite the higher PCB values recorded in some metallurgical plant workplaces, the study failed to find any significant difference between serum concentrations in workers from steel or aluminium production, even in consideration of different tasks or different job seniority, while positive association was found only according to the age of the workers. A possible explanation may be identified in the effectiveness of the individual and collective preventive measures adopted in the workplace. Assessment of the occupational exposure to such compounds, in consideration of the recent classifications as carcinogenic to humans, should be encouraged.

Authors: Fostinelli J, Catalani S, Gaia A, De Palma G, Apostoli P. ;Full Source: La Medicina Del Lavoro. 2017 Jun 28;108(3):174-186. doi: 10.23749/mdl.v108i3.5907. ;