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Summary Determinations of mercury in urine were made in samples collected from workers that were: (a) exposed prior to sampling urine has been sampled over 3 weeks'post-exposure period; (b) currently exposed sampling on consecutive days of the working week; (c) currently exposedurine sampled over 24 hrs, during working shift (morning or afternoon) and off work. Regardless of exposure time pattern in all groups studied, a diurnal variation of urinary concentrations of mercury was observed with a maximum at night and morning hours, and minimal values in the afternoon The great variability in Hgconcentrations could have been related to the time of day at which the sampling took place, and partly to variation of urine excretion rate, the 2 factors being interrelated Only a moderate variability in urinary concentrations of mercury was found when the sampling was instituted at a constant time of day, and when the results were standardized for specific gravity of urine.

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