These include paint, pottery, pipes, pets, and pollution. Mercury - Found its way into the food supply when industry released it into waterways and it accumulated in popular seafood. Cadmium - Used in industrial processes such as plastics, batteries, smelters. Others sources are cigarette smoke and ash from volcanic eruptions. Detergents - These are found under your sink, and in food processing plants.
Accidents can happen in both places, and detergents can get in to foods.
Sanitizers - Antibacterial compounds are used widely in some food processing plants. These can get into food. Greases, oils and fuels - Machinery needs lubricants, food processing machinery is no exception. These can drip into cans or onto foods if we are less than vigilant. Adhesives - Food boxes and packaging have glue and adhesives on them These can get into food.