Variability in Urinary Mercury Excretion

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Abstract
The extent to which 24-h urinary Hg excretion [Q] could be predicted from the concentration of Hg in spot samples was studied. The correlation between these quantities was significantly improved by the application of a correction for urinary dilution and by restricting spot samples to the day''s 1st excretion. If these precautions were taken, for 68% of the samples, Q was in the range of 0.75 C'' < Q < 1.31 C'', where C'' was the Hg concentration of a day''s 1st excretion. The width of this range was primarily determined by variations in a person''s daily urinary volume and by the frequent occurrence of diurnal cycles.

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