Acute mercury poisoning and mercurial pneumonitis from gold ore purification.

We describe four men who had symptoms of acute mercury poisoning following exposure to mercury vapor. They were attempting home gold ore purification using a gold-mercury amalgam and sulfuric acid. Three of the four patients required treatment with penicillamine. The clinical and laboratory data are presented along with pulmonary function test results. Long-term follow-up of one patient indicates residual morbidity, with continued reduction in pulmonary diffusing capacity. This suggests permanent impairment of pulmonary function despite prompt chelation therapy.