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[Occupationally induced hydrofluoric acid burns: an analysis of 9 patients from the aspect of occupational health].

We report here 9 patients suffering from hydrofluoric acid burn who visited our clinic from July, 1979 to February, 2000. These 9 cases occupied 25% of all chemical burn cases experienced in our clinic. All the patients were men ranging in age from 20 to 53 (mean age 35 years; average 36.8 years). At the time of accidental exposures, 6 patients had been engaged in washing or cleaning work, and 2 had been changing the parts of instruments containing hydrofluoric acid. Eight patients received burns on the hands and/or fingers. During the work, 2 patients had used vinyl chloride or rubber gloves, but three patients employed no protection for the hands. After the symptoms began to develop, it was found that the glove of one patient had a pin hole. Coupled with the occasions described in previous reports, the causal factors of hydrofluoric acid burn could be divided as follows: 1) negligence or carelessness of workers, in particular skilled persons, in handling hydrofluoric acid, 2) ignorance of the dangerousness of hydrofluoric acid, 3) the presence of pin hole (s) in protection gloves, and 4) unexpected accident. Hydrofluoric acid is one of the most corrosive inorganic acids, and can produce progressive and serious tissue necrosis with severe pain. To prevent burns due to this chemical, enlightenment and reeducation of the workers regarding the hazard of hydrofluoric acid are necessary.

Accidents, Occupational↗

[Occupationally induced nitric acid and sulfuric acid burns: an analysis of 2 patients from the aspect of occupational health].

We report two patients who suffered from acid burns while working in chemical factories. Case 1: a 44-year-old man who received burn induced by nitric acid on the face and extremities. Despite his protecting facial mask, he was exposed to nitric acid on his face through a gap between the mask and skin surface. Nitric acid was also sprinkled on his scalp which was not covered by a helmet or a protecting device. In addition, he suffered from acid burn on the right scapular region, the right upper arm, and the lower extremities through the work clothes. Case 2: a 26-year-old man who suffered from sulfuric acid burn on the forearms. Both patients were accidentally exposed to acids while they filled tanks with the acids through a hose. Following the manual of the factories, they washed the exposed skin with water for more than 15 minutes after the exposure. Although they recovered without any serious sequel, there remained partial deep tissue destruction of the skin. We reviewed these two cases from the aspect of industrial medicine, and proposed the following three points for improvement in the workplace to prevent accidental acid burns. 1) re-education or enlightenment activities for the well-experienced workers to avoid negligence to the danger of strong acid. 2) recommendation to take a complete shower to avoid overlooking of unaware acid injury. 3) improvement in the protecting facial mask. In addition, clinicians who examine acid-burn patients should not pass over the presence of deep ulcers lying behind the thick crust on the injured area.

Adult↗