Ammonium is commonly linked with industrial and farming products, not just scientific formulas. Ammonium levels are regularly tested in water near farms.
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Safety Concern
Certain ammonium compounds can be hazardous and are regulated for safety. Ammonium nitrate storage requires strict safety measures.
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Not Ammonia
Don't confuse 'ammonium' with 'ammonia'; 'ammonium' has an extra hydrogen atom. Ammonium is derived from ammonia but they are used differently in chemistry.