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I-Naphthol at concentrations ranging from 0-4 to 34-6 mg/l was found in urine collected directly after the end of the work shift from a group of industrial workers employed in distillation of naphthalene oil. The maximum excretion was found one hour after the end of the shift and the mean excretion rate was 057 mglh. Coke plant workers exposed to naphthalene and other aromatic and polycyclic hydrocarbons also had 1-naphthol in their urine. Mean values were 0-89 mg/l (working with new technology) and 4-86 mg/l (working with old technology) and the excretion rates were 0-19 and 0*31 mglh respectively. The maximum excretion was shifted to two to three hours after the end of the exposure. For non-exposed subjects the mean urinary 1-naphthol concentration was 120 cggl and the excretion rate was 7*0 pglh. (Occup Environ Med 1994;51:357-359) l-Naphthol exists in animals as a metabolite of naphthalene.' It is excreted in urine as a sulphate or glucuronide conjugate.24 Keiser et al found l-naphthol in the urine of people exposed to the insecticide "carbaryl".'The presence of l-naphthol was earlier found in urine collected from workers before and after exposure and its excretion seemed to be slowed under conditions of simultaneous exposure to aromatic and polycyclic hydrocarbons.6 This study investigates the excretion of l-naphthol in more detail.

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