AMBIENT AND BIOLOGICAL MONITORING OF EXPOSURE TO POLYCYCLIC AROMATIC-HYDROCARBONS AT A COKING PLANT

The exposure to polycyclic aromatic hydrocarbons (PAH) was measured in a Finnish coking plant over a 7-year period (1988-1994), since the be ginning of production. Hygienic measurements including dust and vapour sampling were performed and the correlations between the concentratio ns of airborne pyrene with the levels of pyrene metabolite 1-pyrenol i n urine were calculated. The profile of measured 12 or 15 PAHs was ver y similar between mean concentrations of personal samples, which sugge sts that it is possible to calculate the concentration of total PAH by using e.g. pyrene as a marker compound. Measurements suggest that the progress of working conditions has been very favourable because the m ean exposure level of shift workers to benzo[a]pyrene has decreased fr om 2.5 mu g/m(3) to 0.3 mu g/m(3). This points to successful measures of technical prevention. The mean concentration of 1-pyrenol in urine has been 0.2-0.6 mu mol/mol creatinine. The concentration increases sl ightly towards the end of the working day, but the correlation between urinary pyrenol and air pyrene was weak. Therefore the usefulness of pyrenol level for predicting the pyrene concentration at low exposure level in the ambient air is very limited. (C) 1997 Elsevier Science B. V.