Perchlorate occurs naturally in the environment, in deposits of nitrate and potash, and can be formed in the atmosphere and precipitate into soil and groundwater. It also occurs as an environmental contaminant arising from the use of nitrate fertilisers and from the manufacture, use and disposal of ammonium perchlorate used in rocket propellants, explosives, fireworks, flares and air-bag inflators and in other industrial processes. Perchlorate can also be formed during the degradation of sodium hypochlorite used to disinfect water and can contaminate the water supply. Water, soil and fertilisers are considered to be potential sources of perchlorate contamination in food. The perchlorate ion (ClO4¬) is very stable in water, and its salts are highly soluble in water.
Monitoring Recommendation: Commission Recommendation 2015/682