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For a bodyweight around 70 kg (155 lb.), the lethal dose of arsenic would be closer to a gram than 100 mg. Current Queue | Current Queue for Medicine | Medicine archives Try the links in the MadSci Library for more information on Medicine.
1 Arsenic is naturally present at high levels in the groundwater of a number of countries. 2  Arsenic is highly toxic in its inorganic form. 3  Contaminated water used for drinking, food preparation and irrigation of food crops poses the greatest threat to public health from arsenic.t is highly toxic in its inorganic form. People are exposed to elevated levels of inorganic arsenic through drinking contaminated water, using contaminated water in food preparation and irrigation of food crops, industrial processes, eating contaminated food and smoking tobacco.