POLYCYCLIC AROMATIC HYDROCARBON EXPOSURE IN COAL-LIQUEFACTION WORKERS- THE VALUE OF URINARY 1-HYDROXYPYRENE EXCRETION IN THE DEVELOPMENT OF OCCUPATIONAL HYGIENE CONTROL STRATEGIES

Studies in coal liquefaction workers were conducted to examine relatio nships between work activities, exposure to polycyclic aromatic hydroc arbons (PAHs) and excretion of urinary 1-hydroxypyrene (1-OHP). In a s ingle-week study in operators, the end of work period 1-OHP excretion was an order of magnitude higher than in a shadow control subject, who experienced exposure by inhalation only (shadowed operator = 15.8 mu mol mol(-1) creatinine; shadow control = 1.07 mu mol mol(-1) creatinin e). Dermal exposure was estimated to account for over 70% of excreted 1-OHP in exposed workers. A second study over 4 consecutive weeks (mul ti-week study) showed consistency in 1-OHP excretion from week to week both in operators and laboratory technicians, indicating little varia tion in weekly exposures for these workers. Excretion levels in mainte nance workers however, showed some week to week variation, consistent with the variable nature of exposures associated with this type of wor k. A further study involving an end of work period spot assessment for all personnel showed a clear distinction between exposed workers (ope rators and maintenance staff) and other workers not thought to be expo sed (laboratory technicians and office staff). Findings in the course of these studies indicated that there is no loss of 1-OHP at 4 degrees C, compared with -20 degrees C. On the basis of work to date at the c oal liquefaction facility, hygiene control strategies have been propos ed involving periodic urinary 1-OHP monitoring.