HealthMap

Nickel Carbonyl Toxicity in Metal Refining

• Extremely High Toxicity: Nickel carbonyl ($Ni(CO)_4$) is a volatile and exceptionally toxic liquid and gas compound formed during the Mond process for refining nickel.
• Mechanisms of Danger:
• It enters the body primarily via inhalation and skin absorption.
• Due to its high lipid solubility, it rapidly crosses cell membranes and the blood-brain barrier.
• Once inside the body, it decomposes into carbon monoxide and reactive nickel species, causing systemic oxidative stress and cellular damage.
• Acute Symptoms (Initial Phase):
• Immediate exposure causes mild irritation, coughing, dizziness, headache, and chest pain, which often subside temporarily within hours, leading to a false sense of security.
• Severe Delayed Effects:
• A latent period of 12 to 36 hours typically follows.
• This leads to severe chemical pneumonitis, non-cardiogenic pulmonary edema, cyanosis, and respiratory failure.
• Target Organs:
• The lungs and brain are the primary targets, but heavy damage also occurs in the liver, kidneys, and adrenal glands.
• Carcinogenic Risk:
• Chronic or acute high-level exposure is strongly associated with an increased risk of cancers of the respiratory tract, specifically lung and nasal cancers.