Arsenic is a chemical that occurs in many minerals. It exists in several nontoxic and toxic forms. When exposed to arsenic, its level in the blood is enhanced for a short while. As time passes, it disappears into the tissues due to its affinity towards tissue proteins. Its half-life in blood is 4–6 hours after exposure. Extreme levels indicate significant exposure; however, it can be detected only at once after exposure. In 2-day-old blood specimens, arsenic levels cannot be detected. Some symptoms that follow acute arsenic poisoning are nausea, abdominal pain, vomiting, hemolysis, hypotension, headache, diarrhea, mental status changes, fever and seizures.
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