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Ingestion and retention of mercury by sheep grazing near a chlor-alkali plant.

An experiment is described in which a flock of sheep was kept for 23 months on a field contaminated with mercury as a result of atmospheric emissions from a chloralkali site. The mercury concentration found in the flesh of the sheep during the trial was within the range present in other commercially available meat. Levels of mercury found in the kidney and liver were elevated, although < 10% of the mercury in the organs or the flesh was in the methylated form. About 0.1% of the total mercury taken in by inhalation and ingestion was retained by the sheep. The breeding performance of the flock was normal. It is concluded that contamination of grass as a result of atmospheric discharges of inorganic mercury from UK chlor-alkali sites causes no hazard either directly to grazing animals or indirectly to humans who might ultimately consume their flesh.