Potassium fluoride,anhydrous
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Fulminant acute colitis following a self-administered hydrofluoric acid enema.

A 33-yr-old white male presented with bloody diarrhea, leukocytosis, and left lower quadrant direct and rebound tenderness after a self-administered concentrated hydrofluoric acid enema while intoxicated from intranasal cocaine administration. Intraoperative flexible sigmoidoscopy and a gastrografin enema revealed severe mucosal ulceration and edema in the rectum and sigmoid colon. Laparotomy revealed an ulcerated, necrotic, and purulent sigmoid colon and intraperitoneal pus. The patient underwent a limited sigmoid resection and a Hartman procedure. Five months later, the patient presented with a rectal stricture which was resected. This case demonstrates that a hydrofluoric acid enema can cause fulminant acute colitis and chronic colonic strictures.


Anodic dissolution of silicon in hydrofluoric acid solutions

The anodic dissolution rate of silicon is investigated as a function of the electrode potential, the doping of the crystal and of the hydrofluoric acid concentration. It is shown that at lower anodic electrode potentials two holes and at higher electrode potentials four holes are consumed. For the rate determining step which depends exponentially on the electrode potential in concentrated HF-solutions, however, only one hole is required. A dissolution mechanism is proposed partly based on the experimental results obtained by Turner.