Urinary methylmercury excretion in persons exposed to elemental mercury vapor.

Elevated urinary methylmercury excretion was observed in a patient poisoned with mercury vapor. When he was treated with D-penicillamine, the urinary methylmercury excretion increased significantly in both cases of twice-repeated 4-day peroral administration, while the urinary total mercury excretion increased significantly only in the first series of administration.