Ammonia gas leak tragedy in Tamil Nadu

An ammonia gas leak at a private seafood processing unit in Tiruvallur district has become Tamil Nadu’s deadliest industrial ammonia leak, claiming the lives of eight migrant women workers. Rescue operations were carried out by the National Disaster Response Force (NDRF) with support from specialized Chemical, Biological and Nuclear (CBN) response teams.

What is Ammonia?

• Ammonia (NH₃) is a chemical compound consisting of one nitrogen atom and three hydrogen atoms.
• It is a colorless gas with a sharp, pungent odor.
• Under pressure, ammonia can be liquefied and is highly soluble in water.
• Ammonia is produced both naturally and through human activities, with annual production from both sources being nearly equal.

Sources of Ammonia

• Natural sources:
  • Decomposition of dead plants and animals.
  • Breakdown of animal manure.
  • Normal metabolic processes in mammals.
• Human-made sources:
  • Fertilizer production.
  • Refrigeration systems.
  • Chemical industries.
  • Household and industrial cleaning products.

Uses of Ammonia

• Around 80% of manufactured ammonia is used in the production of fertilizers, either directly or as a raw material.
• It is widely used in:
  • Refrigeration systems.
  • Chemical manufacturing.
  • Household cleaners and window-cleaning products.
  • Pharmaceutical and textile industries.

Biological Importance

• Ammonia is an essential source of nitrogen, a key nutrient for plant growth.
• In mammals, it is necessary for the synthesis of DNA, RNA, and proteins.
• It also helps maintain the body’s acid-base balance.
• The human body naturally produces ammonia every day as part of normal metabolism, with additional amounts generated by intestinal bacteria.

Health and Environmental Hazards

• Exposure to high concentrations of ammonia can cause:
  • Eye, nose, and throat irritation.
  • Breathing difficulty and lung damage.
  • Skin burns upon contact with liquid ammonia.
  • Severe exposure may be fatal.
• Ammonia generally does not persist for long in the environment, as it is rapidly absorbed by soil and water or converted into other nitrogen compounds.

Response to the Incident

• The NDRF and specialized Chemical, Biological and Nuclear (CBN) response teams conducted rescue and containment operations following strict industrial safety protocols.
• The incident has renewed concerns over industrial safety standards, hazardous chemical handling, and occupational health in manufacturing units.

Sources: AIR & CDC

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